R i r i \ h Ì h l i r r r d i I ' i l c o D k , l o s ci rS r í r i s n i i J ACTINOPTERYGIANSFROM THE MIDDLE TRIASSIC OF NORTHERN ITALY AND CANTON TICINO (SVITZERLAND): ANATOMICAL DÉSCRIPTIONSAND NOMENCLATURAL PROBLEMS CRISTINA LOMBARDO R1i-etl Jnt À.ì èrrlr: ìrriropr.rrsirns, 1\ 2AAl:deetE.lse?k"tbú 2.J.2oal l r l.rdinirn, r.dcsc!iption, Ticino-Swirzerland) (F;g.l).Thisìocrlityyicldedrr;ch faunamadeup of morc thin 3000 spcc;mcnsof fishes, belongingto 1s species, and three specimcns of rhe ^,.r!r,n,. \,cnsoDodt\criii, rulh b$c di nuo\ì$(mphri b.n (Timori sauropterygianLariosaurus E Renesro l9lì1, .oD'enÍi fhr.iicn,i drlh Krlksrhiclcùon. (crlci.e di Mcidc, L i n i t u \ ú p ú n r c ) d i c r . 1 r 1 r Ì r . ( v i s a i ù v, ù . r c ) . d i M ù i d . ( c r n 1990iTinroricr .1. 1985jîntor; 1990î,l990biRencsro ÌiÌTiri,r,. Svi,/rrr), Ali J(iDoRùitji iinon po.oronosciuri/11o&?i 1993).The fish fauna consistsof five gcneraof basrl ld6 úd1,ú, (RijpprlÌ).lrru lror,l (lilsînú Criv€lli, l3l9) e /'eràr actinopterygians înd sevcnof pr;mir;vc neoprerygirns l,J.r/t,/l?d (D(r.kc. lssr), rpú.ir iriruire su ùrtcriJlc provcni.nk (Lombardo 1997) but rhe former exceedthe l:uterin dìsli S.nti di I'.flcdo. pii. sorìmnxlc ddh lirmznnc di Pslcdo vrùìrr. I nuori ri,rurrn.rri hr r, (rseùno di efldruù. h prìnr nunber of specimens,rvith the cxccption of thc do,trslfttr 'r.\cri,rone $rdnlct ,11A|ok?maù^ bdlùtiì c ta neopttrygianProhalecitesponoi (Bellon;, I 357) (Tintori rico{n,zion. inloiii.r .onlpldr d i Pdlil,r,,1bàlr;r h prscizi d.l 1990a), represented by thous:rnds of specinrcnsioùnd rîurido r,, n.l liir\\ico Nlcdio,prrccdcnrùn.ik ncsr in dirus alsoin massmortrlity laycrs.Someoî rhe fish species 'nnr.. !icnc ilrrc\ì.oifcflit1. Ohrc î1lcdc\crizbniinntomiche vcn! . r . d n . u $ i r l c u n in o i n u n r c ( ^ ip m b l r m ir c h t i v ir l h n o r ì c n c h r u r i rhrt constnutc rhe Ca'del Frate faunr ivere îlrcidy itlorr ì Jisli rúori prcc.dcnri,comepurch dìsrribuzion. rnrishfi descr;bed on the basisof old mrterirl collecrcdin rhc ù dd 8d,ùc /./&t^ ch. \ì ùrnolr òdu\ivi dd ljdinico. fnfinc Perledo rre:, rlong thc Ersrerncorst of Como Lrke. \icnr d.s.i,k, un nuo\o qrDrr. irpsren.!r. rì Pù1.ìdirorin. The Perledo-Varenna Formarion hîs bccn known sincethe last century for irs fossil finds, .rndin particu/rrf,?.r. Thr ic,núpr.rvliinr All,netuloù^b.Iatii l\ijppell), /i,,, bîrii (lilìù) CrivcÌli, l3l9) înd Pfl.ir!,r ,,1tLpr'J(Deecke, lrr for irs verrebrare faunr (Balsamo Crivellil8l9i Bclr8$e),$ fú kno\n ftonr thc Pcrlc.loMenbs (uppe! menìbù oÍ rh. lott; 1857jBrssani1886iDecckc1889iDc Alessandrì PÚrcdo,v.ùcnnrri).m.ÍnÌ),irc húe rede$ribdùn rh( b$n olwdt1910).The studyof rhc bcttcr-presened nraterial from pft\ÈnrJ mtrt.riJlconrir{ íionr rhc hc Lldinnn Kllk\chieh,onc of 'ficino, Ca'dcl Frrtc provides good a correlation rvith thc ci dd rÌùc (viiìjiir. vfsc) î.d Msidc (c!úor sNirzùhnl). Thc* nrs rinJ\ in rl,. Nrlkschielcrzoncfic pfriculdy impor Perledofauna (Tintori cr al. 1985iTinror; & Renesro hnr trccru'c rhs rLlouh( iirr d(rilcd rnùoni l dc$riprion ol 1990;Lombîrdo1997;Tintori& Lombrrdo1999). )lbLt,i,loùt' I'd!.trii ù) ú. tomplù. inronicrl aronrion of rDcr The comparisonbcrwccn rhc mrrerial from rhe /dl6!r"/l?rì,hc pr6cn.. of,hc ùùrid lrb in dÈ MiddhTrirsic. rwo units hassrressedrhrt the so-called"Perledof:u:nr' \'hi.h hft prevnùlv b.cn querioncd, ts ùJiÍirmrd. Bcsid$ thc rn.ronìi.rl Jc!rrit'nr\, rÌì. cotrìplì.r.rl rnd problcmrÌicrlnomùEh acruallyconsistsof at leastthreediffercn! îsqtro,rss: 'u!c ùlo d bv pr.rnùrs iurhoÍi ld rh. \p..i.s ol rlr. Perlc,loM.ùF rhe youngestone. coe.al"rrh L.i Jcl Frrre. i' mo'r berir dncuxcd. Thr *r.rigrrphicildis!iburìoD of rh. gcnorP.rlirl,r probrbly fron rhc PcrledoMembeathe uppermostp;rrt n qur\tn .d, rì rlì. Tri.r$ic spccid pfufioù\lv isrrib.d b rhi\ senus ot the Perledovrrennr formlion (for Jiscusion on ùr hù. ùr\nlúrd nor rcltrt.,l r, n. l,iluih1 r reN scnusot prn(istratigr:ìphf scc Tinrori 1998; Tintor; & Lombîrdo 1999).The two sitessharedrc besr rcprcscnrcdspccics in both: Perleítlus dholEis, A olepidotus bellouií and F"to trottii, whìch re to be describedin this p:rper, Inlroducllonanclhilorical remarks rogether with Ptobalecites porroi (Tintori 1990i) and The ìocrliryof Cr'dcl Frare(Visgiù,Varese,Italy) Pehopleurus nuptìalis(Lombardo 1999),as well as rarer bclongsto rhc Kalksch;eferzone, spccicssuchas,4rearc1ep rhe upperfncmberot is naooptera (Lombardo1997i Meridc Lincstonc (L.rreLrdinìan),which crops out Tintor;& Lonbîrdo 1999). bcrwccnValccresio(Iriì;a) and the Mcridc rrca (Canron Thc comparisonwith the Perledom:rterirlis diffiùrIknf): 'r\onon,\: noN Lr\on. Diprdinrok) di S.i.n,c d.ìh T.trù Univ.rsni d0gliSrudidi Mihno, rìa MrnsiJcrlìi 3+, I-:0lll Mìlino, Ihlvi c-nni1:clomhrJo(' tin.n .1.{3 I'is.I All,l.ùhtrcb. ,ttii lRitppcll).R.ronriÒn. scllc bú: l0 nrm. Allolepidotushrs r narrorvrnd subvcrticalpreoperculum. Prrrsemionorids,such as W,tsoaolzs, Pataseníonottsand Osprz,show r wide preoperculum, cvcn i{ in somegcncra,svh asPatacottopbows,Prctne tonnùd rnd Phakln'ona.the preoperculL,m i. n.rrrow Thonasinotus, preopcrcuStezsiororrs havc a lacobxlus, îhe gents Allolepi.totu rvas erectedby Deecke lum rn.rduof 'cvcr.rl.l.mrnr.: 'hr por'criorunr i. n.,r (1.s89)on Perledonrrter;il of rhc spccicsA. xotboso- row end contained the preoperculumsensory canaì. noilcs. \lìrh rhis name Deeckemeant alì those forms \lhen in Prrrscrnionotidrcrhc prcopcrculun L fragwnh dcepihnk scrlesrnd squrrishvcnrraloncs (Deecke mentedìnto smallerelements,the antero-dorsal ele1889: ll3) in ordcr ro distinsuishthem from Herments would correspondto suborbitrls, rccording ro úalepi.totu nd Lepìrlotas.He did not trke inro consid- Lchrmn (1es2)rnd Lchmaner rl. (lsse), and rhe prcer:Ìtionthe skulìpîftern. opercularsensorycrml ran nearthe posteriornrarginof Sinccrhc drra rclrrive ro skull pattern were lacking.;r rv.ì.Jifficuh ro csr.rblirh rhe.ysrcm,rtrc po"rrion As in rllprrasenionotids, rhe elementcorrespon, of this fonn. ft rvrs usually.rnributed to Eugnathidae ding to the suborbitJ in Allolepìdotusdocsnot ovarlap (voodwardls95i Lehmîn1966).P:ìftcrson (1973)dis rhe preoperculum(Paaerson1973). rgrcerl on kccpìng Allolcpidotas wirhin rhis family The number and arrangementof intrrorbitah nr togctìrcrwirL othcr Trirssicgenerasuchas Eoeagzatlzs Allolepídotusis similar to thosc shovn by Watsonolus nd Siroeugaatbu,though all were poorly known gen(Olscn 198a):thcrc are four in{morbnalsnrakìngrhe crr. All of rhcnr"cr. ril.g.rri.l ro rhc,,,oreprirniîive ventral:nd posteriormarginof the orbit, with the Iol grade group, the Parasenrionotidae, togerher with thc and lol much biggcrrhrn Io2 and I04. A vcll-expànded frnilics Tungusichrhyidac, ProD,ccosom;nidae rnd Para, posterior region characterizesIol. A posrcriorly ccnrrophoridre(Prttereon197.1: 28.1). cxprndcd infnorbitrl in the postero-ventralcorncr of Accordingto Pittcrson (1971)prrrscnionorids the orbit, however, is present also in rnany halecodo not have rn indcpcndcntqurdratojugal,bur Olsen morphs and pholidophorids, but not in the (le8a) founda smrllandsqunrish quadratoiugrl in Wat- parasemionotidsWrltson al4s, Pdîasenionot,s^nd Stcnsoaol,is.In contrast,Allolepidotushrs:r splint-like sidrotas(Lehmrn19s2jOìsen1984). qurdnrojugrl, s;nilrr ro thrr found in repriostear(lliley The antorbitrl of ,4llolqpirlotas hrs r widc posrcri1976;Arrît;3 Et Schultzel99l), S?ntoaotas (Schacffer or resionrnd r moderrrelylons rosrrrlproce". rs in & Dunklc t9s0), Ddpdian lPrrrerson 1973), parasemionotids (Lehmîn1952iPrrtcrson1975;Olscn Tetrasonolepìs (Thies l99l), H,/edrd (SchrefferE{ Pît1e84), rmiiforms ^nd opbioPsis (Bàrrram leTs). An terson r9S,+),Prcbdlecite'nd Patalepidotn (Tìrfori rnrorb;trlwith long rostralprocess;sknown rlso;n 1990,ì, 1996). (Patterson1975),n:ìcrosemiids(B:ìrrrîfn Acentrophorus Type-species:,r/l,/qrlurd r.//.Dt (Rùppdl). Dilriburnnì: ividdl.Trnrsic: L,r Lldiniú ol Perlcdo MdÈ b{ (r,ùrdovùùlr hnrrnnt ùnl of Kitklchiclwùn.(Múid. Lin,c\k,nú) orcr d.ùìIe (vi{Liùvscsc)ùrdMùidc(Tr,cH). PLATE I A) A ,lèt\liú"! l,.lkrùi (Rúppdl): ,ic holotlpt .r1rl P, bckft prepar*ion. Sole bilr l0 ùnri B) Allol!tuLrs'I'dlotii (Riippcll): McsNIo P669.S.rlÈ b.n, 20 Dnì (:) ,41/ol.tnlúrcbdlouii (Rùppoll):MCSNIO P655.S.rlc brr: 20 nrnr; D) Allohpihna bdloùìi Bnppúll):McsNlO P615r.S.ilc bîr: r0 mmi [),llollpnlrù^ b. oîîii (Rùppell):MCSNIO P6-19ScrlcbÚ:20 nrnr. ì / , , r i 1 h/ , ' r . , r ! ( , k t r r , , r ' t r , r r r . , , j . 1977),Seníonot"s(Olsen E Mccune t99l), Lepidote' (Weîz t967) ^îd Huletùa (Schaeffer& Patterson1984), though in theselatter forms this bonc is rubelike. The rostral bone of,4/lolEidotas ìs trìangdar; in parasemionotìds it is tube-like, a characterconsidered primitive. A rostrrl bone similarto that ol Allolepidotus is present in Hulexia (Schaeflert{ Pitrerson 1984), Catatus,Anblysenius and amiiforms (Làmbers19e2); many pholidophorids,roo, have such a rostral bone (Nybelin 1966; Pitterson 1975; Z^mbelli 1975, 1977, 1986). The,ysremrricporirionof rhisgenu',r uncenrin: rhere are too few availablcdara abour basalneopterygiansfor r comparison.Moreorea they often concern such characters,as endocranialand endoskeleletal patterns,which arenot availableon Ca'del Fratespecrmens. For these rcasons,I prefer to leave this genus rs Neopterygii incertaesedk. The systematicposition of rhis andother relatedgeneracanbe clearedup only rfrer .tudy of rhe mo.r primirivcTriasiicncoprerygians. Together wirh Alolepidotk' iothosonoides, Deeckedescribedrlso the specres Allolepidotnsrrcppel&. The latter was previously describedby Belloni as Pbolidophorns ruEpell; (Bellorti in Sroppani1857:428) on thebasisofa plastermouldtharconstirures tLe holotype, the deposirorycollecriono{ rhe original specimen beingunknown.Deeckeattributedthis species to the genusAllolEìdotus on rhe shapeof scales,deeperthan wide on the lateralregion of rhe trunk and rhombic on donrl andventralpattsof the body (Dcecke1889:117, pl. V fis.s). Deeckedid nor describethe skull,that according to him is:" ..similar to that of Lepidotus" (Deecke188e:117). De Alesandri(1e10)agreedwith Dceckein arrributingthis speciesto the genr:s,4//o/qptdotas ^ccord;ng to the skull strucrure, fin and scate shrpe.He rscribedto thc.rmc 'pecie,rnotherspecimen storedat the MuseoGeologicodell'Universitàdi Torino, that it ;s no longeravailible.The casrof the Lolotypeof A olePidot,'trEpe|i. storedat the Naturmuseumund ForschunginstitutSenckcnbcrgin Frankfurr (SM P1266),rnd a specimenof this speciesstoredat the SeoizìoGeologicod'Italiain Rome(1918P), exduda rhis speciesfrom the genus, based on the different arrangmcnr of thc skulrbones(pers.obs.). I 1 3 ,p l .V I I I , l i g . 7 . A olEi.lot^ belott lBellori) Oro Fn.), Dc Ahsudri, pp. l 2 l l 2 l , p l , V I I I .f i g . L rgta Pholidopbon6 ckrio,ii De Aìcsrndri, p. 127,pl. VIII, tis.s. t9tÒ PhÒl;dÒpho$obl'neuJBdloÍi (rm tdre), De Ahsrndri. p. r 2 9 - B r , p l _v l l I , f i 8 , r 0 . 1997 AlloL?Aattr notbotonoids Deeeke,l,onrbùdo pp. 9e-113. teta 1999 A|ole?idar". nothúonoitu Drc.ke Tinro.i & Lonrbxrdo, Diagnosis Gnended fÌom Dc Alc$.ndri rer0): snill-\izcd neÒp,erysiin(up to l0 cm of $andùd lcnBrh);spindhahipcd body wnh "hùmp",nÌeior ro doral tin (juveniÌcsslcidff)r donsitc úpps ind towf ilws vnh snr conicaleerhi nùrow preorbin rcsìon ol Íronhì boncs;foui infiioónils vnh inlnorbiúl I beìns Lùsu nrn orhersiopercùlumrectanBul.r.ndrwìceasdeep,srh€rubopercutunr; elÒngÍe rnd rrirngulrr irterop4culumi skull bon.s srrÒnglt ornrmened by eÍoinè tubùdes and rid8e5which fol|o( couAc ofscnsóry cîn.ls; do6al ind r.il fins rhnsuh. viri wdr devetopedhinsins fulcÌa; squîmi,ìon of l5 rrns!è^e rov! of rhick srl$, po*riorly . { n E d . d c c p f l h r n w ' d eo n L l r n r r r . r i o , p r r " f r n r , \ M a l s / | a l4: . x r , h o l o ' y p e fr, o m t { 1 . J , , v r . n r , r " , r l n ì . . r o r e dn s è r i t i o C e o l o e i c od l u l ' r i n R o m e ,M L q N I O t b i r h À o : P669-627,P632rb,P631b, P68,1ù.P685,P688,163t,P690íiom thc K.lkschiefcrzoneÒl Cr del F. e (VissiiL,Vareie)iSM 1237l/b,SM P1256,SM P1244from thc PerledÒ-Virentu Iormrtion; MCSN 31:6 froo rhe KilkschieferzoncofMùid. GI-CH)iMB 75ez (hhelled$ Alklepi.loú, aeppelh' Îrcn thc Pùlcdo-vronnr Ì Ò'm..""n. Disribution: Middlc Triasìc UppÚ Lrdìrin Òf thc Pùkdo Mènber (lenedo v:Ernr Formdion) ind ol ,hc Killtschicidzft (MerideLinéfón€) ofcn deltnÈ (vi88ìù,varNc).nd M.ridr (cin- Oescdption 5Àa1l The rostral bone is a small,trimgular clcment.on whichporesof rhe erhmoidrlco,nmis,ure rre visible on the ventral part (Figs. 3, 4AB, 5ABD, Pl. 1BD). The nasalboneshrve an irregularsLapeand are dorso-venrrallyelongated(Figs. 3, 4AB, SABCD, Pl. IBCD). They meet medially.Length of nasrl bones equalabout1/3 of frontal boneslength. The frontal bones are broad, wirh an expanded posterior region and a narrower înrcrior one (Figs. 3, 4AB, SABCD, Pl. lBCD). The interfrontalsururc showsinterdigitationsat about halfJength.There is an embaymentar the level of rhe otbit, where the frontal bonesconracrrhe supraorbitalbones.The supraorbnal sensory canal mn close ro the larerJ margin in rhe frontal bones and exrendsinto parietal bones (Figs. 4AB,sABCD). Allolepidotusbelloltii (Rùppell) ! i g r . 2 - 6 ! P L1 l3a9 Pnlde,,,r.,r d,rú,ri H.eckel, p.500. 1357 Seùiorot,i bellorii BcllDnì,Bellori in Stoppani,p, 425. t37] Pbotidopbow c"rioiii (Heck.l). Bellori, p.3r (nrnusipt 1339 Alkhpìdob\ noîlne,,oler Dccckc,p-l l8r pl. VI, fig-9. 188e Prolnlopho%obl','s6 Bellori, Deeckc,p. l24,pl.VI,lig.6. t895 AllolctklÒù^ ,Òthoto,nnl4 Deecke, \voodwlrd, pin IIl. 19ra Allalcpnlrr!: nothú.,t ,uleJDecckc,De Al.s.ndri, pp. 116- The prrietal bones are squarish,with irrcgulrr margins.Interparietalsuture is nor clerrly derectable, bur it seemsslightlywîly Medirn and posteriorpit lines ar€visible(Figs.aAB, 5BCD,Pl. IBCD). The dermopteroticsare trapezoidal,wnh rn irregular dorsalmargin.The surfrceof the bonesis strongly irresulrrfor the pre.enceof mrny circulrr opcning'. The infraorbitalsensorycanalran alongthe ventralm:rrgin,enre.insrheexrrdscaspular (F;gs.l,4AB,5ABCD). The extrascapulars are large,trrpezoidarcrcments, deeperthan the parietals.The supratemporalcomnis 151 s MìddleT/;dst actìî oPterygìan sure is paralleledby a series of small spines (Figs. SABCD,Pl. 1CD). Two etongate,rectangularsupraorb;talbones are present;they forfn rhe dorsalmarginof the orbit (Figs. l, 4AB, 5ABC,Pl. lBD). The dermosphenoticsare small elemen* whose mrrgins rre not clearlydetectable,owing to rhe stateof (Figs.3,aAB, sAB). The presenrtionof all specimens infrrorbitalbonc' .rrefour element.of differentsize.. They border the posrero-ventralmargin of the orbit (Fi8s.l, 4A, SABCD,Pl. IBD): Io1 is large,with a rhin bony lrrnella dorsal to the infraorbital sensorycanal Inrrrorbir.rl 2 rs smrllerrhrn lol. The bonei. rectLrbe. ventrrlly meetsthe supramaxillaThe rhird rrngularand infraorbial bone is the bisgestelementof rhe se.ies;it is posteriorlycxprndedand n forms lhe Posterovenr.al cornerof the orbir. Many spines,following the courseof the posterior ends of the infraorbital sensory crnal brrnches, characterizethc surface of this bone. The foutth elemenris the smallesrand is deeperthan wide. Al"ng rhe dor.rl edgcof .rll element.ot the 'eries;re derecrrbleporesof rhe infraorbitalcanal.The antorbital showsr moderrteìylong anreriorprocessand a broad poster;orre8;on(Figs.l, 4AB, sABCD, Pl. 1BD). The prcoperculurnis subvcrticaland naruow.The surfrce of the bone is irregular,with small spinesthat follow thc courseof preopercularsensorycanal.Pores are scatteredalong the longiludinal axis of the bone (Fiss.5ABCD, Pl. 1CD). The operculumis higherthan brord and twice as deep rs the suboperculum(Figs.I, 4A,5ABCD, Pl. IBCD). The dorsalmarginis cuned whiìe rhc ventral one conractsthe suboperculum i. rectanguthrough.,con"er.uture.The "ubopercuìum lrr and about twice as broad as high. At the anterovenual corner of the suboperculumthereis a long rnd narrow triangularinteroperculum.It showswell-developed grnoineridgeson irs postcriormargin(Figs.4A,5ABC, 6, Pl.1D). The maxillais rarherIong and narroq with à peglike internalheadrhat articulateswith the premaxillaand slighdy wary oral and dorsal mars;ns (Figs. 5ABCD). The mrxillary posterior bord€r showsa notch (Figs l, 5ACD, Pl. 1C). The oral border of the maxilh n almost strright and bears about thirty snall, conical teeth. There is a lrrge supramaxìlla(Figs. 3, aA, 5ABCD, Pl. IBCD), extendins frorn the postero-dorsalcorner of the maxillafor almost the 2/3 of its length.There is a srrong,ttiangularprernaxilla;it bears8-9 conicalteeth, somewhatlargerof rhoseborne by the maxilla(Figs.3, 4A, 5ABD, Pl. IBCD). On most of the specimensrhe qurdrate,few elementsof gillarchesand the splint-likequadratojugalare visible(Figs.l,5ABCD, Pl. 1D). The lower jaw ìs a slrong element,dighdy longer tfranthc maxilla (Figs.SABCD, PI. lC). The oml margin berrea scriesof conicalteerhsimilar to thoseborne 'fn Fis.4 A(olepùlotrs bellottii(\'rppèll).Rsronrionof rhèlkullin htúl (^) rnd in dorsal(B) ù€ws. by the maxilla. The ptecise number of teeth ì. "ncleat since the oral border of the maxilla always covers them Pores of the sensory mandibular canal are visible on ventral margin of lower jaws (Figs. 5ABCD, Pl. lBcD). Up to 10 branchiostegal nys were counted (Figs. 3,4A, 5ABD, PL ICD). Th€re is a median, rectangular gulaa with a V+haped pit-line visible on the middle of rhe bone (Fiss.5AD, Pl. 1D). The posttemporalis a large element posteriorly placedto the exrrascapular. The two posttemporalsmeet Pores of the main laterrl line are a short suture. along visible on the ventral margin of the bone (Figs aAB, sABCD, Pl. lD). The supracleithrumis qùite hrge, dorso-ventrallyelongatedand parrially coveredby thc operculum(Fiss.3, 4,A.,5ABCD, Pl. lD) Therearetwo posrcleirhra;the uppermostone is the biggest,rectangular,anddorso-ventrallyelongared.Belowthis is a second by many grnoine ridges squarishelement,characterized arrangedperpendicularlyto the posreriormarginof rhc bone (Fiss.l,4A, sABc, Pl. ICD). The clenhrumis only partiallyvisible,sinceir is coveredby the opercular region (Fiss.3, 44, 58, 6). Fins. In all specimensthe pectoral fins are only partiallypreserved,showingtheir proximalbases(Fig 6, Pl. IBCD). Up to 14 lepidotrichiawere counted.The lepidotrichiaare narrow, and well-developedfringing fulcraborder the anteriormarginof the fins Pelvicfins are madeup at leastof l0lepidotr;chia They ire placed anteriorly to the dorsalfin. On the anterior border of 152 Exsc l1g.3, -Allollpnhtr btllatit (Rùppcll).Skullboncsfu prèsded in sp(imcn| A) MCSNIO p645ij B) MCSNIO p66oiC) MCSNTO p6s/: D) NICSNIO P6s5.Scrleùm:5 nrnì. thescfins rhcrcis r ser;es (Fig.3, Pl. of fringing-fulcrr 1BC). The dorsalfin is rriangulrr and placedat the middle of the bodv (Figs.l,6, Pl. IABE). It is mîdc up of ir lcasrl6 srronqlepidotrìchia, with longproximalbases and short distal scgnrcnrs.Each ray branchesar lcisr rhreerirnes,beconing very thin rr the distalend.There are Nvo to thrcc bisal fulcrr and a seriesof well-dcvclopedfringing fulcn alongrhe anteriormargino{ rhe fin. Thc rn,rlf;n ;s similarin shapcandsrructure to the dorsalonc,but it is snraller(Figs..l,6,Pl. IBCE). Two to thrcc brsrl fulcrr precedethe fin that is mrde up of at lenstI I ìepidotrichir, whichbnnch threetimes. Thc crudrl fin;s hemihereroccrcîl wìth a short body lobc. It is decply forkcd and it is madeup of 21 tays, which brrnch ar lcrst four times. Thc axirl body lol,e shorvss;x-scvenlrrge basrl fulcrarnd rhc firsr dor, salrry is borderedby fringing fulcra.The rentral lobe is preced.dby: couplcof brs.rlfulcrr rnd .hou\,ì "crie\ of fringing fulcralessdevelopedthrn thoseborneby the dorsallobe(Figs.l, 6, Pl. 1BCÈ). Sq"antatio,.Sc le co\eringis nì.dc up of ls rrans\rr,u rosî ol rhick sc,:Ies with strr.rrcdpo.reriorm:r(Fiss. Pl. 3,6, IABCE).Scalcs aredeeperthanwide sins on the lrt€ril rcgion of rhe rrùnk; rhe;r depth dccrciscs graduallytowrrds the posterior part of rhc body. The scalesof the first two rows bchindthe cle;thrum:rre much deeperthan widc; thcir posteriormargrnrs scrrrted. Thc sizesof scrlesdeoeasetow:rrdsthc dorsrl rnd ventral part of the body, rhough they iever teconìc widcr rhan deep.The scalesbearingrhc hreral l;ne are slightly deeperthan arc thc orhcrs.The dorsarscrlesxrc asdeep:swidc;r dorsalscalerow between the postrcmponl rnd rhe dorsrl fin showsthe porcs for thc prsage of rhe dorsallateralIine (Pl. lD). Posreriorro rle dorsil fin, scalesarc snrller and rhombic, with two or rhrce serrationson posterior mrrgin. The scalesot ventml region bctwccnpecroraland pelvic fins of th. """y -. vcry small.Posteriorlyto thc anrl fin the ventralscales are equal in size to rhc orhere.The axiîì body lobc is coveredby snrll rhombic scnles(Fiss.l, 6, Pl. lBcE). Taxonomichislory The taxonomichisrory of A olepi.lotu'bellotíi is very cornplicrtcd. Heckel(18a9)quotedthis spccrcs as Pahconi*u',u,ionu on the br.i' of .: ,pccimcnco,ning fron Perledo;however,he gave ncithcr an illusration M ì.Idlc Trid$ ì c dctìropte1Aidns 353 # l1:. " tll l.rtJi\. t, 1l''rr.RJ$!l \ p c . i r r c nM ( \ N I o l b r _ . r c . r l ab r ' : l 0 n r m . nor a picturc of it. Afrcrrvards,on the basisof a plaster crstot Heckeìsspecnnen (oncestoredat MuseoCivico di Stori:rN:rrurrlcdì Mihno), Bclloni (1873)gaver dcscriprìonof thc spccics,in his Caralogomanoscrxto deipescìfossilì lcl MuseoCi.uìcod; Mìlano \which was ncvcrpubl;shcd), but hc asoibedit to the gcnusPloliThc same spccics hrs bccn nrmed by Rùppell Scnìorotts bcllottii, wirhour giving any published desÙiptìon, on thc basisof a singlespecimen. Se'rlozons bellottii \as nor bccn cven circd, before the formal desoiptiongivenbv Bellottibothon Rtlppcll\spccinrcn antlanotherspecinrcr fronì rhc Curionicollecîion. In a lootnote,Bellottis,rotethat this description wrs nade togcthr with Rùppcìlduringî vìsit to Mil:ìno (18s7: 125).Accordingro rhc InrcrnrtionrlCodcof Zoologìcal Nomenclrrure Riippellhasto be considered the author of the spccies,even if hc cl not fornrally dcscr;beit (Art.50.l.l). Deccke (188e),in his rcvisionof rhc Perledo tauna. brscdonly on spccimens ofthe Rúppellcollection (sceibo!c), crecredrnorher species, Allolepidotus nothoso,rotler,without rcrlisingthe conspccificiry of rhe spccimcnsLc rscrìbcdro Lis new speciesand those descrìbcdt Pholídophorus cqrìonii andSmionotusbet 1oÍii. ln r succcssilc srudy,De Alessandri (1910)agr;n did not noricc thc simil:ìritybctwccn thc diffcrenr species erccteilon thc brsisof thc rwo collccrons,even rhoughìrc had thc possibilitvro rccessto rhe marer;al Èom Mil:rno :rnd Fr:rnkfurt.As:r consequcncc, hc rcdcsclibcd rll thcsc specicsrs scprrrre raxr: Póo1i ,lophau arìonìì, Seniorotus belloxíi nd Allolcpìdotus ,othoso,ùoidcs. Conccrning Pbolidopbotusc"tio";i, De Alcssrndr; contirnrcd rhe mxononicrssexmentof Belìotti, providintr nes,description :rnda pìctureof the cxstthîî constitutcdrhc holotypcof rhc spccics(bur rvhich rvas losr durirc rhe Vorld \lar Il). However judgingfrom the dnwing in thc Bclloni'smrnuscripr rnd frornthc picturcin Dc Alcssandri's prpcr( I910,trr VIII, fig. s), ir crn be confìdently excludedfrom the gen\lsPbolídopborus úd ît the sînre rinrc confirnrcdas belonging to the species currentlvunderstudv In his revision of thc Pcrlcdo n'rtcri,rl, Dc Alcssrndri (1910) redescribedttre spcciesSe'riorotzr ,e11on;i,attr;but;ngit to the genus,4llolepirlotrrbec:rusc of the skullpatternand shrpe.The specincnon *hich Dc Alcssandribascdhis dcscriptionand revisionof AllolEidotus belloxìi belongsto the Curioni collcction. D c A l c ' s . r n d rc! o n s i d c r c di r r o b c r h c , p c c i r r i n desoibedby Belìoai(1357)(th;sspecimen 's stillîviilrblc, bcingstorcdrt Scoizio Gcologìcod'halia in Romc (aa31P)). Finrlly,De Alesandri c;redrnd descrilxd Allolepidotu notbotortorderbut he bel;evedthis spccics wrs lackingin thc collccrionof rhc Musco Civico dì M;lano, beingclearlydiffetent from the others. Thc dcscriptionsand thc picturcsof thc holotypcs oî Pholidopbuuscariozii (De Alessandril9l0: l2z pl. VIII, fig. 5) and thc comp;rrison rvith the holotypcsof (SM Atlotepidotus,otùosonoides 1237i, b, pcrs. obs.) ^nd AlolEidotu' beltottii (a31 Iì par. obs.) conf;rnr the correspondence between thcsc rhrcc nominrl species.To rhe srrne speciesseemsto belong also the specirnenthat hadbcendcscribcdand figurcdby Dccckc $ Pholidophoruoblngur (Deecke1889:12a,pl. VI, fig. 6) andstoredat the Naturmuseunund Forschunginsritut Senckenberg in Frankfurt(SM 1256ipers.obs.). \liLhoutr doubt.thc C.i dcl Frrrc'peci,rrcn' cor respondboth to the holotype of A//olepidotus notbosono,les rnd thrr of Allolepidotusúei1orii. ìn prevrous studiesof the C:' del Fratematcrirl(Lomtardo 1997i Tintori & Lombrrdo 1999)rhis specicswrs circd rs AllolEidotus nothosomoides, for thc conrprrison hrd beenpossibleonly wirh the holotypeoî tha! species. The presenceof the hoìorypeol Allolepìdotus betlottìiin 154 thc Curioni collcction at Scrvizio ceologico in Rome wrs discovcredlatcr. Moreovcr,rhis specimcnwas not prepared andthe skullpatternwashidden(Pl. 1A): only aftcr prcprr:rtion brs it been possibleto confirn the with the determin:uionand to verify the correspondence Ca'deì Frarc spccimcns.Alolepidotusbettottiiis thcreforero be considered the "rlid nrmeot the "pecies. Halecomorphi F:ìmily Caturidae,Owen (1860) GcnusF,ro Gistì, 1848 Diagnosis (fro \vùodsrd l39s:236-290):Tiunk clonS cfusiforn,. ti\rerntrl bone! leebly omimcnted wirh ùbùculîions o. rusúi tÈtlì rch.ivel) hrse and specedor rhe denúry, smallerand i1ùn dosdr'únnsùl on,h. mÍ8in ot thc upps ji$1 ninu'c and dnìo$ snnular on rhe inner bone\, in more rhrn one scriesovcr rhc Nhoh ol,hc sptcnirtiprcopcrcutu,îsn,oorhand nùlow; subopùcu, lu'n of nodeúÈ sizc, lboú hilf rs ltrryer the ncirly.ectnsuh. ú l r c u t u , , r n . t \ . , h , , h o , , s . c n d i n Fp r o . s . r , h r n , c r o - u p c r i o r rnsle.O\\ificriion in ,he sher,hoI the ftro.hord obsmd only in,hè l.rsN, spccìcrìo$ificd ribs sÌcndci Fukn bisrirl. Nclldevdopedon rll thc fiis dftp, rh. poddhl!, on shìch rhcy rc lc.blc. Pcdo6l n,uch scecding thr pelric iins in sizc,hù thc hr.r kll devolÒpèd! dorsil.id ùrlfiis rrirnsuhr, the fornEr ùi in8 opposneor immcdi' rdr behindrhc pdrn iinr; ciudil fin fo.lcd. sciles,hick,wnh i nrroNorcrhpfcd bordù,rn innr rib, ud r fcebh peg androcke rtic uh,bni rupeli.irl $noinè rtuoÒ,hÒn rhc rnt.rnr hlltof erh srle, p6sìnsonpùtolrh.bodrirtorÌinsvùsrusrerndrs,uhtionspos rcriÒrly;principrlfhnk scrhs rf.ll ind rh.i onlv in p.n, dccpcrrhan brord, scvcrrls.rie\ of v.nrrl scrks much brord€r rhtrndcep;pordrricuhÌ sùlcs hrgci ro cnhrsed scàleson thc dos ridgeor in tùe rqlion dt thc inùr. LlRnl lìnc inconspicuous.' .|ypè-spacies: l:no onbonoù !J iAsr$iz, 13l:l .14) oislibution: Middh Trirsic of Ikly (cn dd FÌ.e, Pùlcdo)i Lo\'( Junsic oI f:'rshnd (Dorershner Lyme ResisiLf,ice$ershnei vlr*icksh;c: vhnblr Yorkshirc) ind Fnncc (vilzr Lozèrcj NoF mrndic: L Cxind: Uppú Junsic of lÌrnc. (Ain: Cdn) rnd G(mnr (BrÌsil: llichsift rd solnloÍcn). The genusFrro waserectedl,y Agassiz(1833-a4) x Eugnatbustor narerìalthe Lower Lias of Lyme Regis and Kimnrerìdgirnof Bavaria.Sincethe nrme Eagatúrs had been used ro designatea different animal in 1833 $flhne & Moy-Thomas l9a0), the gener;cname,Faro, proposedby Gistl in 1848,hasbe€nreconsidered.Agassiz includcdìn the gcnusfa3zatlas fisheswith rn elongatebody,,strongdentition and scalesmore or lessornamenrcd and pectinatcd. \loodwrrd ( | 8es) distin guished six speciesfrom the Ensl;sh Lower Lias (Eugnathns oúbosto,ùus, E. philpotae,E. ninor, E. senatus,Eugnatùus ahus nd Erytathus hastìngsìae) úd three from the Kimmeridgianof Barar;a(Erynatbuslongienatus,Eug ndth"s nicrcl.?irlotus, Eugnatùnstatínanxs). The gents wasreportedby De Alessandri(1910)in the Latel,adinirn of Scistidi Perledornccordìngto De Alessandri,the genusis representedin this unir by two species:Eag ndîb"s bernesì nd Eugnatbust/oÍti (De Alessandri l 9 l 0 :9 l - 9 9 ) . Lateron,,Earohasbeenreponedìn rhe Upper Lias tt fim tdtit (Blsno Crirelli, 1319).Rr*or s k u l l i nh k n l ( A ) r n d d o . ú l ( B ) v i e w r . ion oI rhr with the speciesE,gnatbasbtou"olal,ali (Arambours 1e3s) and in the Kimmeridgirn of Cerin (Eugnatbus praelongus,îhollìère 1873; Sainr-Sainc1949). \lcnz (1965)successively Futononnandica, €recredthe specìes from rhe Upper Lias of Norrnrndy. The specimenof Ca' del Fratecorrespondsìn thc generalshapeof thc body and in the skull patternto one of the two speciesdescribedby De Alessrndri on Perledo material ()9t01 97-99)t Furo ttottiì. Tho\tsh incompletelypreserved,this spec;menshowssomeskull featuresthat are typical of the genusFrro and gcncrrlly of caturids.There are asymmetricJparietrl bones (wh'ch arealso presentin Futo ottho*omus,Fwo ninot andFuro elongatus(Saint-Seine1949:fig.69)) showing an ìnterparietalsurure srrongly interdigirarcd,visiblc alsoin Fwo nornandica (Wenz1967:fis.71).The surure bctweenparietalandfrontalbonesh irreSulrr,lvith a lateral processrnterior to rhe surure with thc frontrl bones,which is alsovisiblein CaturasandAnb$senìrs (Lîmbers 1992r150).The presenceof irregularparietrl bonesis reportedalsofor\Udt'on"l"s (Olseî 1984ifig.2) so rhat rhis charrcrer is considercdprinitivc for the (Lrmbers1992:151).Two largcsuborhalecomorphs bitrls are typical for Caturidae(Venz 1967:165);they rre presenr,for instrncc, iD Farc onhonom"s (rJ/oodw.rrdt89s1andCara'erlo/rearRrynerl94l r. The preoperculum is straight rnd subvcnicrl rnd is scparrtcd from the skull roof by the upper suborbnal,rs in Faro nomandícd (\tenz 1967: 166). Thcscfertures,togetherwith r squrmationsimilar MiL e liìd$E adììopî"rr9;ahs 355 nasal(Figs.7AB, 8, PL 2A). The {rontrl bonesarerathcr short with a narrow mterior region and . brorder Poe terior one. Their anterior nrargin is irregulrr rnd the interfrontalsuturcis:lmost srraisht(Figs 7AB, 8, Pl. 2A). The supraorbitalscnsorycanalruns rìons rhc lxteralmarginof rhc bones,enteringrhc pirietîl bones. s'ith irrcguÌar The parietalboncsrre quadrangular, suturcslighhyinterdignrting marginsrnd interparietrl There is r short întero-latenl processon the xnrenor prrt of the bones; on the;r surfacerhc pores of thc supraorbnrlsensorycanrl rrc visible (Figs.7AD, 8, Pl. 2A). The trapezoidrl dernoptcroticsare clongrte At the levelo{ thc contîct betwccn antero-posteriorly. thc parietaland the {rontrl the dermopreroticsproduce a short antcrior process.Thc poresof the suprrtcnporal canrl are placed along the ìnfcrior nr:rrginof thc bones(Figs.7,4B,8, Pl. 2A). The extr:rscnpul,'.tt ti- /i,? ónd;i (BrlsùÌo Cri\rlli. lsr9). Skull oI spccimen !ig.8 rngularandlrrge(Figs.7AB, 8, Pl. 2A). MCSNIO P.rí6. Scrl. brr: l0 nrnr. Thcre are two lrrge suborbitalboncsrnil r third, much smaller,placcdbetweenrhc first two. The dorsal clenrent,the largcronc, lies below thc dcrmopterotrc:tt to thrt dcscribcd by Voodward in the diagnos;s of the Thc shaPc is slightly quadranguhawith round DrarsiDs. gcnus, makes possiblc thc ;utriburion of the Ca'deì of the secondone is moreircgulrr rnd it contrctsthe Fratc specimcn to the gcnus Irro. preopcrculumat its posterior matgin (Figs 7A, 3, Pì 2A). Furo trottii (Bals.mo Crivclli, 1819) small(Figs zAB,8, Pl. The dermosphcnotics:rre l : i g \ ./ _ 9 .P l z A pores infraorbnrl sensorycanalatcvist2A); rhe of the ble along thcir posterior and postcroventralmargiDs. liJSe /,fnld,i óa{tr orLrrn$ Crnclli. p. 7 Thc infrrorbiul serics is badly prescrvcd:there is r (lhli'ro Crndli). B.llotri in Sropprni,p. Sc"i."dtJ.rù" tliT dorso ventnlly elongateelcnrcntborderìngthc posteri13t5 tr?nloùJrr?rtr thl\rn Crn clli, \voodwrrd,pi( lll, p 64 or prrt of the orbit rnd two to thrcc lrrger elenrenrs rîort (Brlsinú Crnclli), D. Alcsind.i, pp 97_99, l91o lrsrrr,r making rhc vcntrrl orb;trl re:ìion. A nanos', slightly curvedelemenrwith tracesof the porcs of the infrroriigs.89-91. 199l r1,,.nnii (hl\rnù Cri\ clli).lînìhùdo, pp l20_110. bìralsensorycanal,ìs intcrpretedas thc ànrorbiral(F;ss. letr, li,n rrorii (Bihnn Crirelli), Înkri e Lonrbùdo, pp. 495_ 7AB, 8, Pì.2A). 50.t. The preopcrculun is subverricrl,*ith r narrowcr Malerial:MCSNIo P.156fronì .lìc (ilkshicf.ùon. (Mclidc dorsalregionand a venrrrlone sligLdycxpmdedand Linlcronc, U|Pc! t.r.linnn) ot ci dd lÌIc (vissiù. vrrcsc) The forwardly direcred.Thc surfaceis smooth (Figs.74, 8. hoknrp.. ror.d r Nlus(, cnì.o diSrorii NÍùnlc dìMihno. hrd regionis lrrge,wirh a senrcrrcuPl. 2A). The opercular brctr lorr. dufins\i'orl{l \V.r il. The subopOishibution:Uppc! Lidi'ìiin {l thr Scnridi I'cllcdo (P{ledolar outline.Thc operculumis qurdr:rnguìrt. vÌrnnl lirnn,iù, ùìd ot,ùc Krlkschicf.rone (Meridr Lin.ionc) crculumis abour1/l of the depthof thc operculumrnd o f c l i . l l i r r e ( v i s s i i ' ,V i r c s o ) . shows n short antero-dorsalprocess(Figs. 74, I, Pl. Diagnosis (oncndùl ironr D. Ale\srndri l9l0): Dody elon shouldhavcbcen The triangolrrinteroperculurn 2A). grcjù.ildnt iron l bonN inr.riùllt con$icrcd ind cnhrgcd Poe on thc shb. only rs impresion bcing represented short, kn*rnd t'loidIntorbnil nrrùwr ìor8 irw\ vnh rutul'rnull'".* rntcri"r visible onll rhc n.rrrow suboóihls $i,h $rlhr oDe ber*.tn is Of the m.rrrll,r rloDc coni.rl ,o.rhr No lrrg. rl.n; \1u11bonN on,iDr.Dt.d by Jrnr'lv spictd ruberclsj (ilos region becausein rhe only îvliì:ìble specimcnir rs Pîr {leúpù rhin bro bchindcl.irhrun1.brùidcÌ rhrn decpin nlid_Pos,o_ tially covercdby gul:r bone and brrnchiostegalrays;its r n r r u g i o ro f t u n l . n r n N v c i , n l l ) i d t e p i r n l b o d y l o b t i N d l orrl marginbcarsn seriesof strong coni€altecrh (Fìss d.vcl()trd hinginir lulcli on mternr nnrgin ofrlllins. 7A, 8, PL 2A). Venrralto the antcriorproccssof thc visible,berringrccthsmrìlmax;lh,r smdl premaxilla;s Description is rcprcscnted by î sinslcincomPlete cr th:ìnthoseborncby mîx;lh (Fìgs.74, I, Pì.2A) This species Thc lower jaw is a strong clement,whosc vcntr;rl rvìrhr SL of t0.acm.lts skullhckspan of thc specnren rnarginis dighrly concave(F;es.74,8, Pl.2A). Thc ofothers. dcrnrlbonesandshowsdisphcemenr antcro-venralregionis chrncteriz-edby thc prescnccof dorso-vcntrally A lrrgc bone rectangular, SÉ,ril oval opcningsrnd alongrhc vcntnl marsin rhc Poresof is intcrprctcd rs rnd visiblefrom the inside, elongrtcd, 156 Df Iìi*,) - /r,r r?rr (llrlînrd (r'ir.lli, lslt). Por.rnr pr* o{ thr bodl o{ spccimcnMCSNIO P.ls6.S.ilc bir: l0 DD. have bcen countcd; Howevcr,;rbout22 lepidotrichia thc nundibulrr crnrl rrc visìblc.Thc oral bordcr of thc le.r'rrhrccri,rr^. Tht.rnrcnornr.rrgin e.rchbr.rnche'.rr boncbearsconicrltecrhtriggcrthanthoscof the muilla. Thcrc is.r l;rrgcsìrieldlìkc qulrr.rvith a smooth of thc body lobc is borderedby a seriesof lons ind welì developedbrsrl {ulcra; rhrcc basrl fulcrr prcccdethe rrfrcc (lìigs.I, Pl.2A). Up to nine eìongatebrrnventrrl lotre.Thereareeìongîteand narow lringing luìchiostesrlrrvs hrrc bccn countcd.Their surfaccis crr on thc n:arginsof both dorsrl rnd ventraìlobes. srooth (Figs.7A.8.Pl. 2A). Sqtanation. Thc singlc spccimcnof thh species All thc skullboncs,if not othcrw;scspec;f;ed, îre ornrmcnrcdbv srrongrnd rounileildcnscly,rrr:rngcd showsonly the scalecovetingof the posterìorand caudal reg;onof rhe trunk. For rhis rcrson it is impossible grnoinetubcrclcs(Figs.s, Pì.24). Thc posncmporrls arcrcctrngulrlthcscelcmcnts ro stîte the nunber of trrnsversescrle ros's. On thc s;zeînd shrpeare ,rnteriorreÍtionof thc rrunk only fcw sc:rlcsrrc visibìcr rrc incomplcte, so thît their prec;se they aredeeperthanbroadimnrcdiatclybchindthc suprunclerr(Figs.zAB, s. Pl.2A). Thc suprrcleithrunis:r bur rheydecrcrsc rr szc lrrcc,subrcctrncular clcncntrvnhsnoothsurfrcc(Figs. acleithrumrnd postcleithrum 7A, s. Ì' Ì.lA). The postcìeithruùis rlso r lrrgerectrn- posteriorly(Figs.9, Pl. 2A). Thc scilesof the lîterîl posterror sìrh.r genrlypccrinrted m:rrgrn. regionof the fl:rnk,rt the levelof rhc dorsalrnd anrl sulrrclcmcnr. (F;gs. fins, are broadcrthm decp.The dcpth of thc scrles The clcithrunis sclì<leveloped rnd sickle*haped decre:rses on the dorsaland ventr:rlrcgions.Ar thc brsc 7 4 , 8 ,P l . 2 A ) . of rhc anrl fin, scrlcsrrc nrrrorv.Aìl scrlesh:rvesen:ued A,rr. Thc lins .rrc prcscrvcdonly in prrr, rs the posteriormargins,cxccprùosc covcringthe body lolre. req;onof the spccinenis hcking rhc ;rntcto-ventrîl with ,""1;..,"'. by rhombicscrles, trurrk;úc pcctoralrnd pchic finslc thelcforcnot pre- The ìrtter;scovered gitudinrlrxcsrthey coverthc dors:rllobeof thc caudrl The dorsrl fin l,rcksthc most :rnteriorlepi- fin for halfof its lensth(F;gs.e, Pl. 2A). dotrichi.r: it h:rs;ule:rstl5 r;rys.rvirhloneproximrlbascs (Fiss.e, Pl.2A).Fdnsinsfulrnd shon disrrlsegmcnts Taxonomichistory cn rre nor prcserrcd.bur thcìr prcscnccis dcduciblc lron thc impression lelt on the rock. The rnrl fin ìs llrc BrlsrmoCrivelli(1819)erectedtle specics opposirerhc dorsrlonc.k is sm:rlìcr th:rnthe dorsalfin .rot.ii on Perledo mrrcrirl. Thc xuthor iscribed rhis rnd ;t ìls rt lcastll raysrthc distrl cnd of thc fin is speciesto the genusLePidot"' brî he pror;ded nc;rhcr (Figs. nrde oi delic.rre rnd shorteìcmcnts 8, Pì.2A). deraileddescriptionnor an illustr:uionof thc specrnen. A hrgc dorsrl lobc chrmctcrìzcs thc caudalfin Bellofti(1857)studiedagainthe speci,ìenol Bîìsanìo (figs. 9, Pl. 2A). It is not possibìeto stîre rhe exrcî Crivcllibut hc considcrcd it nrorcsimilarto thc genus numlxt of rhc lepidotrichi:r bccruscof r fold that Senionotus5ecttse of thc shrpc of rhe body rnd rhc div csrhc dorsrlregiorof rhc fìn fron:thc "cntralone. positionof the fins (Belloniin Stoppani18s7,ll). Dc M ;thllc Ttia$ i c dcrùt opî eD'sid,' (re r0) n,adeanotherrevisionof thisspecies: Alessandri he included it into the gcnusÀzgr,rtlrasbascdon the ornîmentrrionof rhc skull boncs,thc scrrrtionon the postcrior marginsof thc scrlcs and the narrow ventral l9l0:99). Hc rlso Producedlhe scrles(De Alcss,rndri firsr pictr.rrcof the holotype. Thc comprrison betwecnd,c specimenfron Cr' del Fr:uernd thc holotypeof Farorortii is possibleonly and the of De Alessandri by mcrnsof thc dcscription losr durfor rhis litter h:ìs been pictureof rhc specinren, inE rhc world \ftr Il. Ncvenhelesrhc t"o.pecimen. ro corrcspondin body shrpe,skull patternrnd seerns ornimentrt;onof thc bones,scalesshapc.positionof rhefins:rndshrpcof rhc crudrl fin. Thc other speciesof Pcrlcdo rttributed to this genus,l}o /tcnrcsi, is representedby r singleincornrvithacrrshedskull;theinclusionofthe pletcspccimen, C:r'deì Ftrte spccincn in thìs speciescrn be excludedon wcllvisibìe on the photogr:rph thebrsisofthc c:rudrlfin, ofthe holorypc(De Alessrndri1910,r:ìvVfig.2),and rhc conclusnclylcssdcvclopedfulcraon the anterior mrrgin of the rn.rl iin and on both lobesof drc caudrl Bcrg,1940 Ordcr Perleidiformes Brough, 1931 Frmily Pcrleidid;re GcnusPc,/cnlasDe Alessendrì,1910 Dlagnosis (cnrùnl.d lron Dc Ahssndri lel0): Sn,rll ,o n,odioùFsizcdf.'l. itùÍ inh$ Nnlì fu\ilom bodt; ri\ilh vnr rrro{ rntrrnr fugion rnd crpnndcdPorrrior onq Pcg like rccth on onl iisr ùd lrr{{ onó on pilrrl boDsi propdcolùm (ith vide dorîl 'úsn)ni NidL opcrculrr rúsion Nith dPrrculunrslisùrly snilltr rhln rhc 'uùopd.ulur: (ildrl fìn \yith 6 or z tpiriil rrlsi lcPi doùid1n of rll li,I Nni lms ptu\iNl bÀrs Lrtcril mnk scilcs nudcrr,clr high ind decr.r dÌn s'idc; rll$ilN sùnted. Iype-.pecies: Pùhrl,t tlblcp; (D€c.k., I 33r) D s l r i b u t i o nM: i d d 1 . î i r s ì c : U È p . r l , i d i n i ! n o fP . r l c d o M c n ! bù (l'.rlcdo VRnN FornÌrnn, úd of Kilkschiefcrzone(Meridc LinrAiÍ,nc) ofCi dd l'îrc {Vissii,-VÙ.rc)rrd M.ridt (CÍton Tici_ wrs crcctcdby De Alessandri The gcnusPerleidrrs (l9lo) on nrîter;rl coming from Perledo,previoudy dloicP; by Deecke(1889).Thc descrìbcdrs Sanriozotar of Cr'del Frrte ncw finds in rhc Krlkschieferzone ro the type speciesand allos,edro a cerr:rin:utriburion rhe first cornplcrern:rtomical resrorrtion of it This rcrverls the incornpatibility of many specicsso far ascribcdro the gen'.s Peieiclns.Severalauthors hnve crccted specics of Pcrleìdusfron Errly Triassic of Spìtzbcrgen(Perleirlaro'oorlodrliStensió,1921),MrdîPìlctcau, l9l4i P?r/ei gascar(l'erlei.l$ natlascatíensis d"s pieeter i Lehrnan, l9s2), Grecnltnd lPeieidus *oscliezvs Srensiò,19.12),Angola (PerleìdusIutousis Teixeirî, 1947),China (Pe eidusjangtze,r,r Su, 1981) rnd Crnrda (ct. PerlcitlusSchaefferet Mansus, 1976)i from Middle Tr;es;c of Spiî' (Pertei.tsssìsa tcu', Pct leidaslidi Rek!l].,1972),Souù+vesternTurkcy (Perici sp., &s sp., Beltrn ct xl., le79), of Fnncc (Pcrleidas Mazin E Mîrt;n, 1983) înd the Uppcr Trirssicof Morocco (cf. Perlclas Mrrt;n, 1982) ro thc genus Thc attributionof rll thesespecies hrs beenmrdc only on the skull pattern,of primirivc rype,and often on very poorly prcscrvedmaterirl Nevenhcless, the revision,nostly b;bl;ognphicrl,of erch spec;esreverlcda differenrsrructureof the caudrl fin, r dirgnosticfeaturefor thc family Perlcididrc The rcprc"cp:rxirl"fin raysscnsu sentativesof this frmily poscss Hurchinson(Hùtchinsonl97l) andGrrdincr(Gxrdi,,cr 1989;Tintori 1990b).Since 1988iGrrdiner& Schacffcr h;rs orhertLanthe typespccics noneof thc cncdspec;es "cprxial" rays, rhc xrtribution o{ tLcse speciesto the gems Perleídusis questioncd;rs is the prcscnceof thc gcnusin tle ÈarlyTri:rssic. smrtcdrvhenSrcnsiostudThis rnisinterpretrrion ied this genus,crcctingthe specicsPcicìd's uood-^aYtl on mnterialfrom thc E:rrlyTrirssicof Spitzbergen.Pcr Ieidu uoodwardi ts a spccicsof renarkablcsìze (up to 30 cm of SL); is skull presentsr long rnd narrowrosrrrl nisalbones(Stcnsiòle2l:259, boncandlargetrianeular regionis cìcrrly fig.8l). The prttcrn of the erhnroidal diffcrcnt from thrr found in Peieidr abalepn trnd ìn pe{e;d;forns (CleithtolepsGîrdiner l98si Dùrelofu f'J Tintoid 1990;Tbordúpte,rsTintori Et Srssit99ai PcboP' etleìdusBiirgin 1992iCabdnellìaÎnrori & Lombrrdo 1996),which showa largepcntrgonrlrosrralbonc rnd dorso-ventrallyelongrtcd or T+hrpcd n:rsrìbones.In paperthe ethoìoidàlclementsrre cireit.vith Stens;ò's different names:nasnlbonesas antorb;rxls,thc rosrral andtherntorbitrlrs ro* boneasnrsal-postrostralbonc scnsory canals,well r;sible on bonc. The course of tral rhe skull resrorrtion oÍ Perleidusuooh"ardi (Srcns;o l92l: 259, fig.8l) provesthe wrong ìntcrprctitronor theseelemenrs,rs has:rlrerdybeensrrcsscdby P;rrrcrson by rhc inffris rccognizable (197s:507).The:ìntorbital crml, whichin thiselcmentbifurcrtcsto orbhalsensory onc, and the eùmoidrl comntiv ioin the supraorbìtal uootl-^attli the clc sure. ID the restorat;onof Perleidus ment inre.prcred :rs the anrorbitîl is crossedby thc suprrorbitalcanal,bcing obviouslythc nasrl Lrone Pcr Ieiduswooduartlì hts ventrnlscrlcslonger than dccp,irr conrrastwith the rypicrl rhombic shrpc of the ventnl scalesof Perler&r; the scalesof the lateralregìonof thc trunk ate rhonrbic,:rshigh asdeep(Stensiòlez l : pì 33) ":bbreviatchcteroccrcrì"rnd Thc cnudalfin ;s defincdns it is clerr rhrt the axialbody lobe nukes rhe dorsxlmxrl92l: pl. 3l). gin of the fin (Srensiò Subscquentauthors kept considerrt;onrhc work of Stensiò,owing to his xuthor;ty,rnd rhey ;gnoredrhc the nttribuof Deeckernd Dc Alessandri: descriprions tion of thc different speciesro rhe genusP./.t1,6 w.s nr:deon the b.sir of rhe.hull prtt.rn rnd bv comprri- 35S l:;*. tC - lù1!ùlBnltuhtt! ll)clckr, l$89). Rcsor iùn. Sc.l. bf: l0ninr son rvìth rhc spccicscoming from the Spitzbergen, nrhcr rhrn rvìthrhc typc spccics of Pcrledo. Fbr exrnrplc.Pe,/cirlasnadagatcatieais(Pìr ereau lel{) shows:r he'niheterocerc:rl tril, visiblein the prper of Pivctacu(1934:48, fig. 32, pl. VI, fìs.4) rnd on thc orìgin:rlnrrteri:rlstored rt MuséumNîtion:ìl d'Histo;re Namrclledc Paris(MAE 6521 MAE 1371rb;MAE 16,+;ìbi MAE llo,+bi MAE 1023b;MAE Il00; MAE 125)iit:ìlsoshovsxn crhnoid rcgionsimìhrto rhatof Perlcidus-^ootl-^anti(Srensiól92l: 259, fig. 81) rnd of Petleidu*oschiensìs (P;reteauI 934: 46, fig. 30-3I ) . The othcr spccics fron Midisrscir, Pcrteirluspioeted"l (LchDìan1952),;srcprcscntcd by fcw specimens, often incornplctc, so thrr rlrcdcscription of rhc crudrl rcgion is not givcn. The skull shows eleo,entsdifferent {rom thoseof the other species,e.e.,spitaculatplatesof var;rblc sh:rpesrnd the presenccof a postcrior parietal (Lchnranles2). Petleidus :,anltzensu (Su l98l) is representedby r singlc spccìmcn,lackingthe posreriorprrr of rhe body. The skullis chrrrcterized with a veryshort by:r maxill:r postorbitrlrcgion.rnd r rvcrkly convcxorrl bordcr; tceth arc d;ffcrcnt frorn thosc typical of Perleididae: theyarcconicaìon theanreriorpartof naxilì: andblunt rvirhr smrll rcrodincc:rpon rhc posteriorpart of thc PktJsiiern nìnus Rtorgh, 1939in the skull paaern,the shrpe of upper and lowc jrws, thc prcopcrculunr,:ìnd the caudalfin, clearly hemihercrocercal.This spccics wasattributedto the genusPerleidas only on rhe bas;sof rhc pancrn of dcrmJ boncsof rhc chcckrnd the postcrior serrationof the scales. Thc spccicscoming fronì thc SpanishM;ddlc Triassic, Pe eídus giganteus and Pe eidus úai (Belnn, 1972)werealreadyrttributedby Bùrgin(1992)to d;fferent gcnera,Colobodas înd Pf,.roL?ú, respect;vely. A recentrevisionof the Alcover faunacon{ìrmsthe aariburion oî Perleùlussìsdnteusto Colobodu, while Perleidris zrai is more likely to belong ro rhc Ncoptcrygii, owing ro rhc shrpe of thc preoperculumand thc presenceof rn inreroperculumbone (Lombùdo, pqs. obs.). Perleidus sp. from Amélie Les Br;ns (Eastern Pyrenees, Maz;n& Maftin l98l) is represented onìy by few mrssivereerh,with r pointcd trrnsluccntcusp. Thc attr;bution to the gen\lsPetleìduswas rnadeonly by comprrison wirh rceth of Peìcidss stoschìensk, baing sp.tron clearlyinsufficientfor determ;nat;on.Perleìdus rhc I-rdinirn of Turkcy (Bchrn ct rl. )e7e) xnd cf. PerIeidus rron rhe Uppcr Trirssic of Morocco (Mîrtin 1982) are representedby disarticulatedskulls rnd fcw sc.rlcrow,. in.rdequ.rtc for r properdererminrrion. TÈerefore,Peieidusaholepr seemsto be rhe only Perlcilas lutornsìs Tcixcir:r, 1947 n<l Perteidas v id spccics of thc genus Perleidus:this impies t 1clr,aai Schacffcr, 1990 from rhe Lower Triassic of remarkablechangein the geographicrnd strrtigrrphic Angolr cle:rrlydo not belongto this gcnus:"....thc distribution of thegenus, till now considered cosmopolr:ppcrnosr principrl crudrl r:ry nrcersrhc longcsrscrlc irn rnd prcsenrrhroughour rhe Triîssic (Battail et al. row in thc rsirl lobc rnd there rre no "epaxirl" fin 1987;Behan1988).Its presence shouldbe rcstrictcdto rays...:both species h:rvebeenidentified:sperleidids on the Late Ladinian of the Southern Alps (Lombardo rhc basìsof dcrnnl skull prncrn rnd rhe squxrnar;on' r99s). (Antuncsct il. l9e0r25). The diagnosisof the genus has been emended sinceir was forn,crly mrdc on thc brsis of Lowcr TrinsThc spccicsfron Lowcr Triassicof Crnada, cl sic mater;althrt crnnot be ascribedto rhis scnustor rhc Pcrle;drr(Schreffer& Minsus, 1976)wrs dlreadyques with mentroned reasons. tioned by Bútsin (1992) for ;ts resemblance MnL e Tna*t acuaoprerystans .159 Perleldusa|tolepls(Deecke,1889) I r i A \ . 2 .l 0 1 : 1P, l . 2 B C BrlloÌÌì ir StÒppini.p1g.419. 1357 Lqnlr\" tnù6Btllúri, 1st7 PLÒli.lopltort'ob!',tstJ BolloÌÌi. Bollori in Sroppini,pp. 4281ss9 Sotn,tauB ixl4,s Dùckc, Dccckcpp- 120-l2li bÌ Vl, fig. 10. Oeccke,Vood!r.d, prd lll, p- 57. 1se5 5tùn,,rrs.bolqú Dte.kc,Schrll*icn, pp- :24-25. t9at toionr6,rlro|Ìi' t9]10 tutunlB nLahù lD.tck.), Dc Al.$rndri. pp, 49-51,hr ll, fis.2. t91a H.tuúfutùlura pftnùu (B.llori). De Alesrndi, pp. l0l-105, Pcl t91A Pl)alnlo?l)or"i obhnB,r (l'rop!re) Bcll{fii, Dc Alessin{lri,pp. l l 9 - l l l , p l ,v I l l , f i s . 9 . t92a PalenL6.tlolqn (D.t.kr), Srollty.pig. 65. 192]1 Pùhnlt\ rhol.tn (D.tckc). Stcnsiò,pp, 256'257,figs.73 79. t-'t H d , ' r l , t t , ] 'ú , :Ì , . r , , , t / , . ' r { f l l ' r " ' . \ ' r n \ i " , p p . 2 1 6 . 2 r 7 . l i L \ . tett Pù!.nlrc rltÒlctis lDee.kc), Pir€rciu,p- lrl. te52 Pùl.id6,ùolctì' (oceckc),Lchnlrn, p. ll7. t96(, Pùllil6.lblqì' lD&ckc), Lchrrn in Piv.rc.u, pp. I l4-l15, 1990 l9el r9r5 1997 1999 Polùl !altuh?^ lDccckc),Tlntori. p, l9l,ùyl, A,r/.r.16l/',, Ilúrsnr,pp.60 61,Iis. 59. Prl.i16.lblqn lDeccl,c),Búrsin,pp- 306-3ll, li8s.2-6. I'o!ù!$ nlù,la?nlDèt l,c), Lombirdo, pp.5l-75, fi8s,36-55. tuldlu\tholqs lDttckc), Tir roÌi & Lombrrdo.pp.l95 501. M a t e a l : M C S N I O P + 6 1 - + 6 1I .' t o 1 . l t 9 9 l ' 1 6 , P 6 7 6 6 3 1 , 16s6, P637. 169lrb, P692rb. MCSN 1007, 1003,5004rh, s005, I'lNlUZ 1 .1960.I.1961,T.1793. 50O6rb,5007ùbcd, Dislribulion:Llrr Lldiniin of sùti di Pùl.do (Perlcdo-vàren nr lirnnÌnx) îid oi K.lkschicfcúone(Mride Limesore) ofCr'dcl I:ri,c (vissìi,-vA) rnd ìv.rid. (cirron Ticino CH). Dagnosis (drcrdcd fron De Alessrndri 1910): Mediúnsi2rdrpccicsof 1.20nN of mrriDun, lensrii op{cùlu m slishryrnrlld ,hii $,borùculun,i sircle suborbnrlt Jen,nion nrde ot pes-like tc.rlì oD o'rl mùrsinoi mrxilh rnd dcnÌÍ_r rnd blún, R.,h on pilÍrl scilc rows. lacnl turk sàres boD.\; \qurn rbn of rz ùins6c tlropd rhîr \' 0. ciudil fin of l8 l.pidorichir with 6 'ep:xirl" nysj bonc onnnr.trhtion !.presentcd br'' sinoinc tubcr.les rnd short FiE lt - Púlèilrt dbolepú lDccckc. l83e). Reron,ion ol thc skull in hterd (A) md dosrl (B) parietrlbones(Figs.10,1lAB, 12ABC,Pl. 2BC). The parietal bones rre hrge and squarish;the interparietalsutureis wary, as is the anteriorand latcral margin of the bones, where rhey contact the frontal bonesand the dermopterotics.Poresof the supraorbitrl sensorycanalarevisiblein the anteriorhalf of the bones ( F i g ( .1 0 .I I A B . I z A B C .P ' . 2 B ) .T h e d e r m o p t e r o r i c s are rrapezoidal,elongateelements.The suprrtemporal sensorycanalran along thc rnedianpart of the bones, (Figs.10,11A8,12ABC,PL whereporesaredetectable Description 5Érll The rostralboneis lrrge and subpcntrgonal; 2BC). The extrascrpularsare recrangularwnh rounded rhc ìateralbordcr presentsa narialnotch. Its surfaceis by grnoincridgcs(Figs.10, l1AB, 12BC, posterioredge.The mediansutureis short and strright. ornamented Poresof the supratemporrlcommissureare visible on on spccimens l Pl. J87.T\e ornlnentrrionis diffcrcnL diffcrent ontogeneticscrges,being stronger on larger the whole length of the bones.The supratemporalsenThe nasalboncsrre irrcgularrnd elongated sory canrl enteredrhe dermopteroticanteriorlyànd rhc specimens. posteriorly(Figs.10, 11AB,12ABC,Pl. Jonorrntrrlly. They present.rn anteriorerprn.ion. post-temporal with the openingfor rhe nrrirl notch belo* The poste- 2BC). The dorsal marg;n of the orbit is bordered by r i o r b o r d e r . . L g h r l yc o n v e xr n d o u t l i n e t' h e r n t e r i o r rhree suprrorbital bones;the first two are rectangular, ran nrarginof rhc orbir. The supraorbitrlsensorycanal lasr one is biggerand trianSular(Figs.10, l1AB, the alongthe lengthof tLc bonc (Figs.10, I lAB, |2ABC, 12A, Pl. 2C). The dermosphenoticsare very th'n and Pì.2B). elongareelemennplacedon the postero-dorsalmrrgin The frorrrl boncs are broad and rectangular;the border in contactwith the supraorbitalbonesis slighrly of the orbit rnd posteriorlyin contact with suborbital. Poresof the infraorbnalsensorycanalare visibleon thc convex.Thc ìntcrfronrrl suturc is straight,exceptfor an indentationin the posterior hal{.The supraorbitalsen- lengthof the bones(Figs.10,11A8,12A,PL2BC).The infraorbital series;s made of two largc crescenticelesory canal entered at the întero lateral corner and menrs,vhich outline the latero-ventraledgeof orbnal rerchcdthc posrcriorm:rrginof the bones,endingin the 160 Na B openinq.The elemcntin contactrvith rhe dermosphenotic is largcr rhrn rhe secondone; borh hrve setrated ventr:rlbordcrs. A sm:rllrntorbitrl reachedrne rosrrl bone (Fies.10, llA, I2ABC, Pl.2B).Thercis r single suborbir:rl:n is quire largeand rcctangularand contacts rhc dermosphenoticrnreriorly.The postcrior border is serrltcd(Figs.10,114, l2ABC, Pl. 2BC). The preoperculurnis very hrge, with an expanded dorsal reeion :rnd a nrrrow ventral one. Th. p"'.e.or edgecontrcts rhc dennohyal;thc porcs of preopercular rn.oru crn.rlrre rrr.rnguJin r linerlong rhc posterior border of rhc bone. A well-devcloped infraorbital proccss is present(Figs.10,114, l2,{BC,Pl. 2BC).The opercuìumis dccpcrthrn wide; it conrrcrsrhe subopercuìun with a slìghtly convcx suture. The rectanguhr subopcrcuìumis bigger than rhe operculum (Figs. 10, l lA, l2ABC, llA, Pl. 2BC). The upper jaw is formcd by r srrong maxillaand a srall prem*ilh, bcrring 4 or 5 teerh similar in shape and sizc to thoseborne by rhc mrxilla. Thk latter hasa narrowrnterior regionand rn exprndedposrorbnalone (Figs.10, llA, I2ABC, Pl. 2BC). The oril margrn,s straight; tcerh are ;rbsentin rhc posrerior part of the fis. r? - Pùlc;.lrs rlralqi' (Dcecke, 1339).Skùllboncsispturoncd 'n rpcdmen\: A) MCSNIO P60s;B) MCSNIO P607iC) M.\NIO t60.1.iq ( I.r,J t bone. The dentition is madeof 20-25srrongteeth,whh the rypicalpegJikeshape;the first 10are similarin size; reethbecomesmallerin the posteriorpart of thc maxìlIi (Figs.10,114, 12ABC,Pl. 2B).Thc palare is dentigerous,bearingteethofdifferenr size.Largemd srourrc.rh predorninate.The lower jaw is clongrre, with straight oraì and ventral mrrgin. Anterior te€rh rrc sinìilar in shapeand sizc to rhoseof the 1nteriorpîft ot rhe ma\illa; posreriorlythey becornehrgcr. Pores of the mrndibularsensorycanri rre visibleon the ventralprrr of the dent;rr.7(Figs.10, I lA, I2ABC, PI. 2B). Up to 6 triangLrlar bnnchiostegalraysrverecounted (Fig.12C).There;s a singlemedianovrl gular(Figs. 12CP , l.2B). The posttenrporalsare two large and tr:rpczoidal elements,separared{rom erch other by r couple of \crle' lFiss. 10. llAB, l2AB. PL 2BCt. The posrerior edgeis roundedand lrterally are detectablethc poresof the supratemporal sensorycnnal coming trom rhc extrascapular. The supracleihrum k elong:rtcddorso ventrallyand contactsthe cleithrum rr rhe lerel of the suturebeween operculurnand suboperculum(Figs. lo, 114, I2ABC, l3A, Pl. 2BC). The anteriorrrrrsrrrrs Mi ddlc Tiase. a. u nopt.rrszùs 361 DI Scl opì fis.lJ Pe .ì1116 nlral.p^ (Doccl(t,lsse). A) MCSNIO P60abrB) ciudrllin Ò{MCSNIO P5oln.Scilc bir: 5 n,n1. alwryshiddcn by rhc operculum.Postcleithrumis a large elemcnrornamentedby tuberclesand shon ridges of ganoine(Figs.10,llA, l3A, Pl. 2BC).The cleithrumis partially visiblc, bcins coveredby the suboperculum. The posterior part is convexwnh ornnmentarionmade of short ridgcsof ganoine(Fì8s.| 0, I lA, 12A8, Pl. 28). Fias. Pectoralfins hrve 8-13 lepidorrichia.Each ray consistsof a long proximrl baseand shorter distal segments.Each branchesat least twice. The anterior mrrgin of rhe f;n bearsa seriesof strong frìnging fulcra (Figs.10, llA, PI. 2BC). The pelvicfins aresmallerthrn rhe pecronlsr rhey have 7-t3 lcpidotrichia,s;milar in structureto thoseof rhc pecrorals (Egs. 10, 1lA, Pl. 2C). Thc dorsalfin is in the posteriorhalf of the body It is triangular andcons;sts of I2-17lep;dotrichia. Distrl segncnrs branch rr least twice. Two or rhree basal fulcraare present,and therc is r serieso{ fringing fulcta alongthc rnrcriormrrginof the fin (Figs.10, 134, Pl. 2BC). The analfin is smrll rnd triangularand is madeof 7-r0 lepidorrichir.A coupleo{ basalfulcra and a series of fringing fulcra on rhe rnterior margin of rhc fin are present(Figs.10,Pl.2C). On spccimen P 605ther€are two largepreanrlscutcs,with senatedposterioredgc. The caudalfin is almostsymmetrical,wìth a short axiaìbody lobc.Thcrc arerbout 28 lepidotrichia;6-7 of rhcm rrc "epaxial".The nys rre scgmentedand they branchat leastthree times.Both the dorsaland ventnl marginsbearfringing fulcra (Figs.2, 10, l3B, Pl. 2C). Squanation.'fhescalecoveringconsisrso{ 37 vert;cal scalerows.The scalcsof the anreriorregion of the trunk arc deeper than wide; they bccome gradually srnallertowards the posrerior pan of the body. The scrlesof thc mtcrolaterrl {lank region rre rccrrngular; thcir dcprh decreases towardsboth rhe dorsalrnd venrral resion where rhey bccomc rhombo;dal (Figs. t0, 13A, Pl. 2BC). A mid-dorsalridge scaleis present.At the baseof the dorsJ fin, scalesare smalland wìderthan deep(Fiss.10, llA, Pl. 2BC). Scnlcsof thc posrerior part of the body rre rhombic, only slightly wider thrn deep.All scalesare serrated. Taxonomlc hlstory Perleidusaholepiswas ercaed by Deecke;n 1889 asSenionotusaholepison mrrerialcoming from Pcdcdo. que'rionedrhe rs\ignmcnL Schellwein ol rhisspecies ro the g€nusSezrbrotus,stressingthe primitive prtrcrn of rhe skufl (Schellwein1901t24-25) and De Alessandri erectedthe new genusPoleidzs for it. The speciesh;rd actuallybeendescribed,bur not figured in 1857by Bcllo:li ^s Lepidot"s'eratu' (Bellorti 1857:419) ànd Proli dophowsoblungn (Bellorri t8s7: 428). Complri,ons with the counterpart (rhe only avrihble prn) of the holotype of Lepidotus setatas and with the drawing of the holotype oÍ Pùolidophotusoblungusmadc for Bellot, Li' prperconfirmthe .rtrriburion ot rhcsc,pccimenrto For Perlcidn alnlepts,a. well as for m.rny'pccie' coming from Perledo,there exisrs considerabletaxonomicconfusion.Deecke(188e),revisingthc Pcrlcdo marerial,erectedthe spec;esPerleid"sattoleprìwithout comparing his mrterial wirh that of Bellotti. Decckc consideredrhe prper of Belloni not vrlid, beingwithout dr.wings(De€cke1889:110-111). Lîrer on,De Alessandri (1910)r€-studied the originalmaterialof Bellotti, but he did not understandthatP abolEis, L. senatusand P oblmgaswere the samespecies:he just erectedr ncw gcnusfor the Deeckes species.I think thrt zerle ar ser ntus, as slell as Perleídusoólaaszs,could be considered a nonen oblitan. ft has never been used aftcr Dc Alessrndri,while subsequentauthorsalwaysmentioned 162 Iris. l.l - Dr,nrì {r,r,$ g.n. n. sp. n. Resontìor. Scàlebù: 5 mm. only PerleidusaLolepis,except for Bùrgin (1995) who finr nored rhe nomencbtorirlproblems.sincemore than 50 yearshas passcdwithout mentioningPerleidu' seratus or Perleirlusoblungus, one can considt Petleidus Itolqprr (ahhough"junior synonymous")to be the only Danlniagen.n. Diagnosisràsfo!specie!. Typ€-speci€s:D,,rDn Jptdz sen. n. \p. n. Etymology: dcdi.r.d ,Ò chnluc. Dmini, cun.or of Civico Mu*o lfulbrico di sioria Nrunk dilndunoOlon4 for his brsic rnd conr.i' cortribution to rhe studrof the locrlny ofctdèlFdrc. Typelocality:Cn dd Iì& (vissii'-vr), Ihlyi Ilre Ldinid- Remarks This speciesis attributedto Perleidiformes on the skull pattern,wìth the largerosrralbone separatingthe nisalbones,the maxillashowingan enlrrgedpostorbnal region,rnd rhe preoperculumdorsaUyexpanded(Bùr gin 1992;Tìntori & Lombrrdo 1996).Also, the structurc of caudalfin, with the presenceof"epaxial"fin rays, and the lateralscalesdeeperthrn widc on the ànt€rior rcgion of the body are typical of this group (Grrdiner 1988;jGardiner& Schreffer1989;Bùrgin 1992:TinÌor]. tr Lombardo 1996).Brsìcrlly,somc peculirr characters do not allow attributing it to any known genus:this genusis in facr diffcrcnt from any orher perl€idiform taxon in the stronglyserratedscalesand in the srructure of tLe fins. These rre chrracterizedby long prox;mal basesand by distalsegm€ntsthat areshorte. but alwiys muchlongerthrn broad.In addnion,the caudalfin rays, in otLer generr usurlly scgmentedbeginningfrom the baseof the fin, show very long proximrl brses. Éiymology: frcm rhe L.tir vord ftxnr', rtf€rcd ro thr ,hony ippcú.nce of rhe $ale coy€rins. P668rb (hólÒtypÈ), rro hc Matarial: MCSNIO K.lk$hiefcu ore of G' dd lìrte (visgii'-vA); McsNIo P6l8ab, P666!b, P667,P669,P67A,P671^b,P6721b,P673îb, 167a, ló75!b fron rll€ Krlkrbiè{ezone otct dd Fn.c (viseiù vA) Groredin,ie civico M!$o Insubrico di Sbrià Ndunle di In.lùno olori) rnd McsN I,5008Írom rie KJkschic{e.zóneÒt Meridc (cin'on Ticino' CH) Gtorcd in the MuroCin,onrle di storìi NÍunh diLuslno). Type-localily:Cr'dd Fúre (viseiù-v4,lhlÍ hr L.di',ian. DisFibution: Upper Lldini.n {Middh Trià$ic) ot KJksl'iele.zó.e (Mùide l.úlk) ol cr dd Fr.e (visBiìrvA) .nd ol Mddè (crnrÒnTicino-cH). Diagnosisrsnill p{hidiform wirh elonsrÈ tùsilùnn body: opercularlegion vidci p.opèrcùlùn wnh n.Íow vcnral resio! rnd Ro Na Danlnlasplnosagen.n. sp, n. F i g s -l 4 - 1 7 ,P ì .2 D - I 1995 O/Jioptn cl.l.?bn,t Bùrgin,pp,8l8-820, fi8,,2-14. 199/ Pcrld,rd sp. Lonìbrrdo.pp, 76 73, fis. t6- B F ; 9 .1 5 - Daùinia spinùd Aen.n, sp. n Rsrontion Òf the sku hteral (A) and in do.s,l (B) liews. 363 Itl ì.Lile Trìasic dcti"optelr\ia$ median pit line is present.The interparietalsuture is srtaight(Figs.14,l5AB, 1óBD). shapc The dermopteroticshavea sub-recràngular pr€sence of is irregulrr owing to the rnd their surface small openingsand pores of the sensory cînrl, well detcctableon the ventral marginof rhe elemen* (Figs. Description 14,1sAB,16ABD,Pt.2F). S,èrii.The rostral bone is large rnd pentagonal, Extrascapulars are triangularand narroq with an with thc rypicrl pcrleidiformoutline.The ethmoidal irregularoutlinedue to rhc presence of tuberclesand perpend;cularly arrangedto the commissure;s well vìsiblcon the ventralmarginof the short ganoine ridges (Figs. ganoine cresn 14, clemcnrrnd is linedby short posteriormarginof thc elements.The two elements l5AB, l6AC, Pl.2F). Thc nrsrl bonesconsistof large are in contactby meansof a short suture (Figs. la, sub-rccrmguhrelenents:the suprrorbit.l scnsorycanal 15AB,lóABD, Pl. 2F). It is impossible to locrrer dcrentersthe postero-dorsîlcorncr,wherethe nasalbones mcct the frontal bones.Thc surfrccis smooth (Figs.14, The scriesof infraorbitalsis mrde up of one or lsAB, l6AC, Pl. 2F). The frontrl boncsrre wide,with two denderand elongrtc elementsborderingrhe dorsrl rn exprnded postcrior region and r narrower antenor mrrgin of the maxilla,followed by r larger crescenrc one.Thc posteriormarginis roundcd.The supraorbital bone on the postero-ventralcorner of the orbit. Pores (Figs.14,15A8,l6AD, Pl. sensory crnal hrs rn S-shapedcoursei it enters the rre detectable on allelemenrs anrcro-vcntralcorner of the bonesrnd rcachesthe parietal bones.Thc intcrfrontal suture is stnishr. The surThe shapeof the preoperculumis typical of per f:ce of these clcmcn* is only feebly ornamentedby leidiforms,with an enlargeddorsrl regionanda natrow' (Figs. Pl. 14, 15AB, 16ABCD, rugaein a few specnrens er ventnl one. Its ventral margin embrrcesthe dorsal 2DF). Thc prrictal bones are large and squrrish; they margin of the maxilla.The preopercularsensorycanaì rcccivethe sensorycrn,rl from the frontal t onesand a ran along the posterior margin of the bone (Figs. 14, !\prndcd donil onc Ni'h dcleloped infr.orbitll pro.ess; lons .nd pÒi .d k.rh on bodì upperrnd lovcr irNsi sqùlnlion ol 36 or 37 rrnsrsc scrler"*'; x.l*,lc€pd thrn widc in antro'ldcnl resion of trurkt nl sùlcs dccph rcú.r0d: rnil rnd do6rl fins with hldd b$.t c!ù,hl finofibou,27l.p o.icìriris.reD epùial ùúdrl fin Fr la ,, li*.t6 I) nrid 'pntúì sti. n. sp. n. Skullborcs s prerned irspecinrens:A) MCSNIO 1662;B) MCSNIO P669iC) MCSNIO P6l0i D) MCSNIO P6l2b. Scrlcbrr: ì mm, 16.{ I ir. | - / r . r x , / i . . , r ' . . , q L ì r . \ p . . r t r i Ì u l p . r r u ' ' l ; ' J l c r n d bodyof MCSNIO P6lri. S.ilc brr:5 mm. l5A, l6AD, PL 2DF).Thc opercular regionis widcrnd rccransulrr,with r rounded postcrior mnrgin.The suture betrveenopcrculumrnd suboperculumis alwrys difficultro derecr, owingro rhethinness of thebones,so th.rrthc 'h,rpc.rnd,izeof erchelemcntrcmrinsuncerrain.On spccinrcn MCSNIO P667a sm.llantero-dorsal processof rhe suboperculum gives the position of boundarybetweenthe rwo bones(F;gs.164, Pl. 2F). The surfrcc of thc opercularregion is ornrmentedby concentricstriaeat ìeaston the do.srl ma.gin. Thc m:rxilh shorvsrhc rypical perleidiform outline, wiù rn cxprndcdpostorbitalregion and r slender anrcriorone.The or;ìì ffrrgin bcrrs scverrlrows of long and pointed tecrh; on rhe anterior tip of the nraxillary (premrx;lhry))teeth:ìreslighrlylonser(Figs.14, l5A, l6AD, Pl. 2DF). Thc mand;bleis a strongwedgclike elemenrbcaringrccthsimilarin shnpcrnd sizero those of thc mrx;lh. On its posteriorprrt r lrrge angularis present,;rndthe ventralrcgion showsthe courseof thc mrndibuhr scnsorycrnal (Figs. 14, l5A, 16AD, Pl. 2DF). The palamlregion bearsconicalrccth hrger than thoseborne by nrrxilh and lowq jaws,rnansed 'n sev- st.;ae(Figs.14,l5A, l6AC, 17,Pl.2EF);on a fewspccimensrherc are rwo rows of minute denticles:rrnngcd along the antero-ventralmrrgin of the elemenr.On the dorsalareathe courseof rhe lareralline sensorycanalis visible.The postcleìrhrumis subtriangular, with r roundedposteriormarginand a straightvcnrralonc; the ornamentrtionis sirnilir ro thar shownby the supracleithrum. The cleithrumis wide rnd sicklelikc, bur irs outlineir not clerr.osrng ro rhe vrre of pre.erv.:rion. Firs. All fins are characterizedby :r rcmrrkable development:paired fins are long, whilc med;anfins show a brord base.owing ro the delicacyof rll fins, their distal endsare poorly preserved.The pcctoralfins haveabout ten lepidotrichir, wirh long proximal brses andshorrdisralsegments. They branchrt lcrst twicc and rherearestrongfringingfulcrr rlong rhe rnteriorm.rrgin. Pelvicfins rre mrde of long and slenderrays;thcy are placcdrr rhe I2rh scal€row înd opposircrhc dorsal fin. Fringing:ndbasalfulcrî îre nor visible(Fiss.l,r, 17, Pl. 2DE). The dorsalfin is placedrr rbour rhe 18 20th scale row rnd shows a brord base;;r has :r leîsr 15 lcpi dorrichir, with very long proximal brscs.An ovrl scute and 2-3 strong basalfulca prccedethe fìn. The anrl fin At lqrst fivc rriangularbranchiostegrlrays have is locatedat abour rhe 20rh scalerow and it snowsrne bcencounted;theirsurf:rce is smooth. the dorsalone; h hasrr lcrsr 15 rays Behindthc exrrrscapulars rhereare two postrem- andtwo or threebasalfulcrr. In fronr of the fin thereare porrls w;th r roundedposteriormrrgin; rhe supraorbitrl two or more pre-analscutes:on specimcnMCSNIO sensorycrnal rin on the venrralregion of eachctemenr ó73a the larger one shows a sub-ovaloud;ne, with :r rnd rcrchcsthe supr:rcleithrum behind(Fìss.14, l5AB, round,:d.rnLcrior mrrgin.:ndrn irregul.rr po,trriorone. l6A. 17,Pì.2EF).Therc is a largeovalsupracleithrum Ganoineridsesendingwith r tip ornrncnr rhc surface with orn.rnrcnr.rriun th.,rconsi'r'of delit.rre conccnrric (Figs.14, 17,Pl.2DE). The c.udal{in has25,27rrys, ILATE 2 A) lrrJ r?r', (B1lúno Crirelli, ls39): MCSNIO Pas6:B) Prkid6 dhalEn (Dccck., l33e): McsNIo P6o2tC) Pcleidb altok\ lDtcc^. rss9): MCSNIO lrtorii D) D"tiÌh spnnn {e\ \. sp, n,: 'h. holÒrtpoMCSNIO P66et E) Dd|ntd Vkúa Fn n. sp-n-: MCSNIO P67]li E) Dd,nd *nrM s.n. n. \p. r.: MCSNIO P662. lt l È r . . i ,{*"Ì ' ; ; n 166 with sevcn "epaxial"rays; lepidotrichiadre segmented and even distal elementsdre clongate.Both the dorsal rnd ventrrl lobes show strong and long basalfulcra; fringingfulcraarenot visiblc(Figs.13,16,Pl. 2DE). Squanatiox. Squamation consists of about 37 rînsverse scile rows; all scJcs are characrerizedby a distinct;velyscruircdposteriormrrgin. Scrlesaredeeper rhrn brord on rhc rntero-lateralregion of the flank, while scrlcs of the ventrrl rnd dorsal region arc lower but, os'ing ro rhc deepserrat;on,ir is impossibleto identify tbcir preciseourlinc. Beginningfrom the dorsalfin and towards thc posterior part of the body, scrles decrcrsein depth,becominghnceolateon rhe axialbody Iobe. Therc rre large basalscutesin front of borh the dorsaland venrr.l lobe of the caudalfin and one or two prc-rnal scuteswirh largc denticleson thcir posterior margin.Thc surfaceof the scalcsis smooth; the lateral scalcsbehind the cleirhrunr show 6-7 long dent;cles whose numbcr dccreasestowards the Posterior,dorsîl rnd vcntrrlregionof thc body (Figs.14,17,PI 2DE). recognisableon specimcnT 4964 for its pentagonal shapeand the ethmoidalconmissurethat runs through ir. The maxillaL not narrow and eìongate,but is madc enlrrscdrcsionànd: nrro"cr rnterior ol r posLorbirrl one.The interopcrculumis absent.The axialbody lobc, accordingto Bùrgin, extendsabout hrlf way rlong the lengthof the dorsallobe of the caudalfin (Bùrs;n 1995, pg. 819); the specimensfrom Ca' del Frate and Meridc show "epaxial" fin rrys, excluding rh;s gcnus fronr of rhese.p..;-,.' to The .rrtriburion neop(erygians. the genus Opfioprs rnd in particuh. to the Perlcdo speciesseemsto havebeenmrdc by Bùrgin on rhe brsis of rhe genenl shapeof the body and rhc fins, thoughthc 'ome difference' in m"'t mcrisaurhorhimselfstresse. holorype of (Bùrgin l99s: 819). The tic characiers re10, rav (figured De Alessrndri by ophiopsisleptutu III, fig. a) has been losr, but a cast of ir, storcd at the in Senckenberg Nîturmuseumund Forschunginstirut Frankfun (P 12a3),shows clerrly some of rhe typical ncopterygianfearurcs,suchasa nrrro* and venicrl prcoperculumand the interopcrculum(p*s. obs ) Discusslon belongingto this The size of mosr specimens speciesis very smrll; they reachabout 35 mm of toril show the srnc sizeand length.Atmost all specimens come from rhc samebedd;ngplanc. As for other taxa comìng from Cr'dcl Fratc, which rre clusteredin sizechsscs,(Lonbardo 1997;Tintori 1990a;Tinrori èt Lombrrdo 1999).thcy probablyreprcscntthe sameontogeby the mostlikclyiuvenile: thìsis supported ncricst:rge, presencein rhe collectionof r singlespecimenof larger s;ze(MCSNIO P61sab).This kind o{ srmplingmaybe relatedto thc scasonalityof thc Ca' del Fnte dcpositional environmcnt(Tintori 8. Lonrbîrdo 1999). Some specimcnscoming from tbe Middle of Meride,storedat MuseoCrntonale Kalkschicferzone di Storia Naturale of Lugano and at Palàontologische Institur und Museumder Univcrsitàtin Zùrìch,are rr tnburedtc rh.rr"rmc 'pecier.The .rlc of preser";tion o{ rhescspccimensallowedcomparisonthem with the rnd. .trLh. ..rmerime.que.tìonCr'del Frlc spcc'nrens madeby Bùrsin (1995) Búrgin ing the determination describedthesespecimensts Opbiopsi cf. teptutxs,bur rhe obsenatìon of sone skull eìen,ents(especirllyon T 4964rnd MCSN 3014)suchasrheopercuspecimcns Irr region,shrpeand sizeof preoperculum,rostraìbone, fron the genus thcscspecimens rnd maxilla,excìudes Opl'iop';. nd morc cencr.lly, from : neoprerygirn group (pers.obs.).The preoperculumis not narrow,as in neoprerygirns,but it showsa wide dorsalregionand along the posterior margin pores of the preoperculrr sensorycanalare dercctrblerconsequendy,this rrea is not occupicdby the largesuborbir:rlsmentionedby Bùras the Pregin (199s:819). The elemenrinrcrprered mrxillary is, on thc contrary,a hrge rostral bone well Ackna@ledqenkni\. G. Adh ind M. wilson did rhe Íniciìind ìirsunric rt ins: I inì veryB.Íèfúl tor thci! hclprnd Pr.cio{s su88c$nrnsMintthinks 80 to A. înrorifor thc lonsrnd siruì.ting dncusìons,whichSrcit ly mp'"'rd 'h.. prpcr v\ ',nnte rhrnk' r." '- rll 'h ir.:'J'inr' vho save tinrncirl suppon {or fiold work borh r cr dd F-nt ind Mùide; ,hè cirico Musco l."ub.icÒ dì s,orià Ndurft di Llduno Olon( thc Múnicipihy of Vissii' rnd th. MuscoClnk,nrlc di Srorir Natunle di Lùg.no: spccill thtrnksgó to c Drnini rnd M lcltrci 'fh,n", s" ro rlì rho'c *ìr- h.lprJ 'n collc'rinr rl, 'p..iN(n' f n. cirlly D. Moriiio. C. Ptr.orind M.Tentoro{rhe Mrrco I'rlcontolosiund có lî Roccn'di Mon{rl.onc- I m indehtedto ,hc Nruflruru'ì Fó6chùnsìnrirut Scnckcnbùs(Fnnkf un im Mrìn), PrLionblosn.h. In*no, und Museun dèr Univcsitir (Zuri.h), Musóum NdnDd dHn,onc NJruElle (Prit. 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