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New Coelacanth Material from the Middle Triassic of Eastern Switzerland, and Comments on the Taxic Diversity of Actinistans

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New Coelacanth Material from the Middle Triassic of Eastern Switzerland, and Comments on the Taxic Diversity of Actinistans Swiss J Geosci (2013) 106:161–177 DOI 10.1007/s00015-013-0143-7 New coelacanth material from the Middle Triassic of eastern Switzerland, and comments on the taxic diversity of actinistans Lionel Cavin • Heinz Furrer • Christian Obrist Received: 1 February 2013 / Accepted: 9 August 2013 / Published online: 16 November 2013 Ó Swiss Geological Society 2013 Abstract New coelacanth material from the Middle Tri- preserved on the holotype and allows the addition of new assic Prosanto Formation of the Ducan and Landwasser characters to a previously published data matrix of acti- area near Davos in eastern Switzerland, Canton Graubu¨n- nistians. A phylogenetic analysis is performed, which den, is described. A sub-complete individual is visible in supports that Ticinepomis is nested among the Latimeri- ventral view, and shows details of its branchial apparatus. idae. The diversity of post-Palaeozoic coelacanths is In particular, it possesses relatively large teeth on the assessed. The taxic diversity of observed occurrences ceratobranchials, and possible ossified hypobranchials. shows a peak in the Early Triassic and a peak in the Late Few diagnostic characters are observable, and most of them Jurassic, as detected in previous studies. When ghost lin- are visible on the mandibles preserved in lateral view. This eages are included in the computation, the Late Jurassic specimen shares characters with Ticinepomis peyeri,a peak is smoothened. By comparing the taxic diversity smaller form from the Middle Triassic of Monte San curves with the curve of average ghost lineage duration, we Giorgio, whose holotype is re-described in part here. A conclude that the Early Triassic peak of diversity was second specimen, a fragmentary caudal skeleton shows the probably caused by a biological radiation, whereas the Late typical supplementary lobe of coelacanths, and meristic Jurassic peak of observed diversity is probably the result of characters indicating probable close affinities with T. pey- a Lagersta¨tten effect. eri. We refer this material to Ticinepomis cf. T. peyeri. Because the new specimen is larger than the holotype, we Keywords Prosanto Formation Á Ladinian Á Phylogeny Á refute the possible juvenile status of the small specimen Taxic diversity Á Branchial apparatus from Monte San Giorgio. The new material of Ticinepomis from Canton Graubu¨nden shows anatomical features not Institutional and anatomical abbreviations PIMUZ Collection of the Palaeontological Institute Editorial handling: D. Marty. and Museum, University of Zu¨rich Ang Angular Electronic supplementary material The online version of this a.Pa Anterior parietal article (doi:10.1007/s00015-013-0143-7) contains supplementary Apal Autopalatine material, which is available to authorized users. Art Articular L. Cavin (&) art.fa Articular facet Department of Geology and Palaeontology, Muse´um d’Histoire ax.mes Axial mesomeres Naturelle, CP6434, 1211 Geneva 6, Switzerland Bb Basibranchial e-mail: [email protected] b.fen Basicranial Fenestra H. Furrer Boc Basioccipital Pala¨ontologisches Institut und Museum der Universita¨tZu¨rich, Bs Basisphenoid Karl Schmid-Strasse 4, 8006 Zurich, Switzerland Cb Ceratobranchial (numbered) C. Obrist Ch Ceratohyal Erliackerweg 8, 4462 Rickenbach, BL, Switzerland Cl Cleithrum 162 L. Cavin et al. Cla Clavicle v.pr.Pa Ventral process of the posterior parietal Co Coronoid (numbered) IX Glossopharyngeal foramen De Dentary (l) and (r) Refer to ossifications from the left and right Dpal Dermopalatine side of the specimen, respectively d.p Enlarged sensory pore within dentary D1.b Basal bone of the first dorsal fin d1.f First dorsal fin 1 Introduction D2.b Basal bone of the second dorsal fin d2.f Second dorsal fin Coelacanths form a clade of sarcopterygian fishes known Ecl Extracleithrum from the Early Devonian (Johanson et al. 2006) up to the Exo Exoccipital present day (Smith 1939), with a long fossiliferous gap f.pop.sc Foramen for the preopercular sensory canal during the whole Cenozoic. The group is known for its f.VII.m.ext External mandibular ramus of the VII evolutionary conservatism and studies have shown that Gu Gular coelacanths reached their peak of taxic diversity during the h.a ? s Haemal arch and spine Early Triassic (Cloutier 1991; Forey 1998; Schultze 2004; Hb Hypobranchial Wendruff and Wilson 2012). In the Middle Triassic, the Ih Interhyal diversity was still proportionally high, with 6 species n.a ? s Neural arch and spine according to Forey (1998) and 12 species according to Op Opercle Schultze (2004) (the difference is due to the way authors ot.sh Otic shelf assessed species status), plus some new species described Part Prearticular from 2004. In Europe, the properly-defined Middle Triassic Pb Pharyngobranchial species are Alcoveria brevis Beltan, 1972, from Spain; P.b Pelvic bone Garnbergia ommata Martin and Wenz, 1984 and Hain- P.Co Principal coronoid bergia granulata Schweizer, 1966, both from Germany; Pmx Premaxilla Heptanema paradoxum Bellotti, 1857, from Italy and Ti- Ppa Postparietal cinepomis peyeri Rieppel, 1980, from Switzerland. The p.Pa Posterior parietal latter species has been described on the basis of a specimen Pop Preopercle discovered in the famous Middle Triassic locality of Monte Ps Parasphenoid San Giorgio in Ticino, Switzerland (Rieppel 1980). In Pt Pterygoid 1985, Rieppel described fragments of a larger coelacanth p.w.Pro Posterior wing of the prootic from Monte San Giorgio, which he referred to cf. Holo- pec.f Pectoral fin phagus picenus (Undina picenus according to Rieppel, Q Quadrate 1980 and Undina picena according to Forey, 1998). Out- Ra Radial side Europe, Middle Triassic coelacanths have been Rart Retroarticular recorded in the USA with Moenkopia wellesi Schaeffer and ros.m Median rostral Gregory, 1961, and recently in China with Luoping- ros.l Lateral rostral coelacanthus eurylacrimalis and Yunnancoelacanthus Sb Suprapharyngobranchial acrotuberculatus (Wen et al. 2013). Sc Scale Here, we describe new coelacanth material of Ticine- Scc Scapulocoracoid pomis cf. T. peyeri from the Middle Triassic Prosanto s.l.c.f Supplementary lobe of the caudal fin Formation of the Canton Graubu¨nden. Characters of these So Supraorbital new specimens, together with new observations on the type Sop Subopercle specimen of T. peyeri and new information from recently sop.br Subopercular branch of the preopercular described coelacanths, allow us to perform a new phylo- canal genetic analysis, and to discuss the taxic diversity pattern Spl Splenial of post-Palaeozoic coelacanths. Stt Supratemporal Sy Symplectic 2 Geology, stratigraphy and palaeoenvironment T Tooth t.p.Bb Basibranchial tooth plates Since 1989, systematic prospecting and excavations in the t.p.Cb Ceratobranchial tooth plates Middle Triassic Prosanto Formation by a team of the Zu¨rich Uhy Urohyal University and volunteers directed by one of us (H.F.) Coelacanths from the Triassic of Switzerland 163 provided a rich fauna of well-preserved vertebrate and fragmentary but articulated remains of another terrestrial invertebrate fossils from this Fossil Lagersta¨tte (Bu¨rgin tetrapod, Macrocnemus (Fraser and Furrer 2013) must have et al. 1991; Furrer 2009). The assemblage comprises plants, been washed in. invertebrates such as bivalves, gastropods, and crustaceans, as well as vertebrates including fish and reptiles. Among the fishes, ray-finned fishes (Actinopterygii) are represented by 3 Materials and methods saurichthyiforms, peltopleuriforms, perleidiforms, gingly- modians and halecomorphs (Arratia and Herzog 2007; The material under study consists of a sub-complete Bu¨rgin 1999;Bu¨rgin and Herzog 2002;Bu¨rgin et al. 1991; specimen preserved on a slab of dark limestone, and a Herzog 2001, 2003a, b). caudal fin in dark marlstone. The caudal fin was prepared A first fragment of a coelacanth, consisting of an articu- only mechanically with thin steel needles under the lated caudal fin, was found in 1992 during the first systematic microscope at the Palaeontological Institute and Museum, excavation in the main fish beds of the upper Prosanto For- University of Zu¨rich (PIMUZ). The preparation of the sub- mation at the locality Strel (2,580 m a.s.l.), located 10 km complete specimen was done mechanically with an air tool, SW of Davos. The second specimen, a sub-complete fish, thin steel needles and sand blaster all under the micro- was discovered in 2006 by one of us (C.O.) in the middle part scope, completed by chemical treatment with diluted acetic of the Prosanto Formation at site DF 10 (2,750 m a.sl.l.) near acid totaling 240 h of work by one of us (C.O.). We took the Ducanfurgga, 13 km south of Davos. X-ray photographs of the branchial apparatus in order to The Prosanto Formation of the eastern Swiss Alps is detect more details, but it was unsuccessful. The fossils are formed by a 100–200 m thick sequence of dark limestones, stored in the collection of PIMUZ. Osteological nomen- shales and dolomites. Overlying the Vallatscha and under- clature used in the descriptive part follows Forey (1998). lying the Altein formations, the Prosanto Formation extends The parsimony analysis was run in PAUP* 4.0b10 for more than 20 km as a lenticular intercalation in shallow (Swofford 2001). A heuristic search (using random addi- water dolomites that are part of the strongly deformed tion sequence, replicated 10,000 times, 1 tree held at each sediments of the Austroalpine Silvretta Nappe near Davos iteration, and tree bisection and reconnection branch (Figs. 1, 2; Furrer et al. 1992). The diverse fauna and flora swapping) was carried out to try to avoid the ‘islands of of sauropterygian reptiles, fishes, molluscs, crustaceans, trees’ problem (Maddison 1991). marine and terrestrial plants (e.g. Bu¨rgin et al. 1991; Furrer For analyzing the diversity of coelacanths through time, 1995, 2009) in the Prosanto Formation shares many simi- we plotted the amount of observed genera for each epoch larities with the classic Late Anisian/Early Ladinian Monte of the Late Permian–Recent time interval (‘observed San Giorgio Fossil Lagersta¨tten in the Southern Alps (Be- diversity’).
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