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Generic Diversity and Distributional Dynamics of the Palaeobatrachidae (Amphibia: Anura) Michael Wuttke, Tomáš Přikryl, Viach

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Generic Diversity and Distributional Dynamics of the Palaeobatrachidae (Amphibia: Anura) Michael Wuttke, Tomáš Přikryl, Viach Generic diversity and distributional dynamics of the Palaeobatrachidae (Amphibia: Anura) Michael Wuttke, Tomáš Přikryl, Viacheslav Yu. Ratnikov, Zdeněk Dvořák & Zbyněk Roček Palaeobiodiversity and Palaeoenvironments ISSN 1867-1594 Palaeobio Palaeoenv DOI 10.1007/s12549-012-0071-y 1 23 Your article is protected by copyright and all rights are held exclusively by Senckenberg, Gesellschaft für Naturforschung and Springer. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author’s version for posting to your own website or your institution’s repository. You may further deposit the accepted author’s version on a funder’s repository at a funder’s request, provided it is not made publicly available until 12 months after publication. 1 23 Author's personal copy Palaeobio Palaeoenv DOI 10.1007/s12549-012-0071-y ORIGINAL PAPER Generic diversity and distributional dynamics of the Palaeobatrachidae (Amphibia: Anura) Michael Wuttke & Tomáš Přikryl & Viacheslav Yu. Ratnikov & Zdeněk Dvořák & Zbyněk Roček Received: 19 September 2011 /Revised: 30 November 2011 /Accepted: 12 January 2012 # Senckenberg Gesellschaft für Naturforschung and Springer 2012 Abstract A small palaeobatrachid from the Late Eocene of frontoparietal, one of the most frequently preserved skeletal Kučlín, Czech Republic is described and compared with Mid- elements in the palaeobatrachids, in a sample of Palaeoba- dle Eocene palaeobatrachids from Messel, described here as trachus grandipes from Bechlejovice, Czech Republic. It was Palaeobatrachus tobieni (Sanchiz 1998) comb. nov., and with found that other genera in which the frontoparietal is known Middle Eocene palaeobatrachids from Geiseltal. P. tobieni is (Pliobatrachus, Albionbatrachus) basically fit into the range the earliest palaeobatrachid documented by articulated skele- of variation seen in Palaeobatrachus. Therefore, the differ- tons. The description of the Eocene palaeobatrachids from ences that can be observed (e.g., sculpture in Albionbatra- Messel and Kučlín necessitated a revision of all palaeobatra- chus) may be interspecific in nature, rather than intergeneric. chid genera. In order to correctly assess taxonomic variation Moreover, some of the diagnostic characters of these genera within the Palaeobatrachidae, we studied variation in the are already used to diagnose the palaeobatrachid family (e.g., synsacrum in Pliobatrachus). Accordingly, it is proposed that these genera be synonymized with Palaeobatrachus, and that M. Wuttke variations among the currently recognised genera be consid- Section Geological History of the Earth, Department of Archaeology, General Department of Cultural Heritage Rhineland ered diagnostic at the species level only. The distribution of Palatinate, Eocene palaeobatrachids, encompassing only western and Grosse Langgasse 29, central Europe, contrasts with the distribution of palaeobatra- 551 16 Mainz, Germany chids in post-Eocene times. This suggests a shift in their T. Přikryl : Z. Roček (*) distribution between the Late Cretaceous and Palaeocene Department of Palaeobiology, Geological Institute, (western Europe) and the Pliocene and Pleistocene (eastern Academy of Sciences of the Czech Republic, Europe). The last palaeobatrachids were recorded from the Rozvojová 135, Muchkap interglacial (621–568 Ka) in Russia. This implies 165 00 Prague 6, Suchdol, Czech Republic e-mail: [email protected] that palaeobatrachids, as obligate water-dwellers, did not sur- vive the Oka glaciation (474–425 Ka). They were probably T. Přikryl “trapped” between a periglacial zone with temperatures below Department of Palaeontology, Charles University, freezing in the north and a dry steppe zone in the south. Albertov 6, 128 43 Prague 2, Czech Republic Keywords Anura . Palaeobatrachidae . Osteology. Europe . V. Y. Ratnikov Palaeogeography. Evolution Department of Historical Geology and Palaeontology, Geological Faculty, Voronezh State University, University Square 1, Voronezh 394006, Russia Introduction ř Z. Dvo ák The earliest record tentatively assigned to the Palaeobatra- Severočeské doly a.s, Doly Bílina, 5. května 213, chidae is a poorly preserved fragment of maxilla with pecu- 418 29 Bílina, Czech Republic liar lingual knobs between alveoli, recovered from the Late Author's personal copy Palaeobio Palaeoenv Barremian of Spain (Buscalioni et al. 2008). The oldest were subsequently described as Albionbatrachus wightensis doubtless representative of the Palaeobatrachidae is an iso- (Meszoely et al. 1984). However, Hossini and Rage (2000) lated fragmentary frontoparietal from the Lower Campanian questioned the generic status of this species, and considered it of the locality Villeveyrac in southern France (Buffetaut et to belong to Palaeobatrachus. The only Late Eocene palaeo- al. 1996). Indeterminate palaeobatrachids, represented by batrachid from continental Europe (documented by angulars, disarticulated angulars, one presacral vertebra, distal hu- presacral vertebrae, and humeri) is from Grisolles, France meri, and numerous ilia, have been reported from the Late (Duffaud 2000). Campanian or Early Maastrichtian of Spain (Astibia et al. Frontoparietals similar to that of Albionbatrachus were 1990; Duffaud and Rage 1999), and another indeterminate later recovered from the Early Oligocene of Hoogbutsel, palaeobatrachid was reported from the latest Maastrichtian Belgium (Duffaud 2000), from the Late Oligocene (MP 30) of Spain (Blain et al. 2010). Furthermore, Estes and Sanchíz of Oberleichtersbach, Germany (Böhme 2008), and from the (1982) described Palaeobatrachus occidentalis on the basis Early Miocene (Agenian) of Laugnac, France (Hossini and of three ilia from the Late Maastrichtian of North America, Rage 2000). The frontoparietals from Hoogbutsel and from although Sanchiz (1998) later doubted the generic assign- Laugnac were assigned to Palaeobatrachus (the latter as P. ment of this species. This was supposedly the first robustus), with the implication that Albionbatrachus can be palaeobatrachid known outside Europe. Recently, another considered a synonym of Palaeobatrachus. palaeobtrachid-like fragment (fused V1+V2) has been The post-Eocene history of palaeobatrachid frogs is reported from the Late Maastrichtian or Early Pliocene of documented by numerous finds that have been, however, North America by Gardner (2008), and a partial ilium and mostly restricted to central and eastern Europe (roughly east not sufficiently prepared urostyle from the Early Maastrichtian of the Rhine and north Italy). They are completely absent of Alberta, Canada by Larson et al. (2010). Moreover, a from Oligocene localities in France, but have been recorded recent taxonomic revision of Neusibatrachus wilferti Seiffert, in Belgium, Germany, and Switzerland. In the Miocene, 1972 from the Late Berriasian–Early Valanginian of Spain palaeobatrachids are also unknown in central European lo- revealed that all its taxonomic characters were either typical calities, although they are abundant in localities of the same of Palaeobatrachus or in agreement with the expected ances- age (e.g., Gritsev) in eastern Europe and perhaps even in tral primitive morphotype from which palaeobatrachids sup- Turkey (Claessens 1997). This suggests an eastward shift in posedly evolved (Báez and Sanchiz 2007). This would point the distribution of palaeobatrachids (Rage and Roček 2003). to Neusibatrachus as a possible ancestral form of the The youngest records of the Palaeobatrachidae are from the Palaeobatrachidae. Middle Pleistocene (Mindel I/Mindel II) of Kozi Grzbiet, Perhaps the earliest Cenozoic record of the Palaeobatra- Poland (Sanchiz and Szyndlar 1984) and from several locali- chidae is a small specimen of Palaeobatrachus from the late ties of approximately the same age (Lower Neopleistocene Palaeocene of Cernay, France, comprising a synsacrum, according to the Russian stratigraphic scale) in the basin of ilium, and humerus (Vergnaud-Grazzini and Hoffstetter the Don River (Ratnikov 1993, 1996, 1997, 2002a, b, 2003). 1972). A humerus from the late Palaeocene of Hainin, Palaeobatrachids have not been found in younger anuran Belgium, may also be referrable to Palaeobatrachidae assemblages (Ratnikov 2002a, 2005), which suggests that they (Groessens-Van Dyck 1981). Additional palaeobatrachid became extinct approximately 0.5 Ma ago. material from Hainin is mentioned by Folie (2006). The Except for the few finds mentioned above as belonging to Eocene record is substantially richer. In Belgium, indeter- Albionbatrachus, all palaeobatrachids that date to the Mio- minate palaeobatrachids are known from the Lower Eocene cene or older have been assigned to Palaeobatrachus, of Dormaal (Godinot et al. 1978), and Duffaud (2000) whereas those from the Pliocene and Pleistocene have been assigned fragmentary frontoparietals from Boutersem to assigned to Pliobatrachus (Ivanov 2007). However, the Palaeobatrachus cf. grandipes. Several articulated but latter genus was mainly based on a disarticulated synsacrum poorly preserved skeletons are known from the Middle when first erected (Fejérváry 1917). Only much later did Eocene of Geiseltal, and were assigned by Špinar (1972) Sanchíz and Młynarski (1979) assign additional specimens to Palaeobatrachus grandipes. Similar skeletons are known to this taxon. from Messel, Germany (Wuttke 1988). Recently, additional Themainaimofthispaperistoformallydescribe material was recovered in Messel, tentatively
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