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Maisch M.W.,Hartmeyerstr. 6 | Matzke A.T.,Am Stadtgraben 3 | Rathgeber T.,Staatliches Museum fur Naturkunde
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2013

The holotype and only specimen of the small suchian archosaur Dyoplax arenaceus O. FRaas, 1867 from the Stuttgart-Formation (Schilfsandstein) of southwestern Germany is partially redescribed and re-evaluated. The type locality can be identified as Stuttgart, not Stuttgart-Feuerbach as erroneously suggested by previous authors. A re-description of the skull and the dorsal armour provides several new characters and a restoration of the skull is attempted for the first time. The phylogenetic placement of Dyoplax is discussed. Although it is agreed with previous authors that the taxon is not an aetosaur, its placement in Crocodylomorpha is questioned. Instead we demonstrate that Dyoplax has several important cranial and postcranial features in common with Erpetosuchus from the Late Triassic of Scotland and North America, and it is tentatively re-assigned to ?Erpetosuchidae. © 2012 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany. Source

Maisch M.W.,Hartmeyerstr. 6 | Matzke A.T.,Am Stadtgraben 3
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2014

The dicynodont Sungeodon kimkraemerae n. gen. n. sp. is described on the basis of a skull from the Lower Triassic Jiucaiyuan Formation of Dalongkou (Junggar Basin, Xinjiang Uygur Autonomous Region, People's Republic of China). It is the first representative of Kannemeyeriiformes from the earliest Triassic. Kannemeyeriiforms were the predominant clade of Triassic dicynodonts, which constituted a major component of terrestrial Triassic ecosystems. The new taxon helps closing one of the most significant gaps in the fossil record of dicynodonts, since stem-kannemeyeriiforms are known from the Late Permian, whereas the first true kannemeyeriiforms previously known are late Early Triassic in age. After a phylogenetic analysis Sungeodon belongs to the family Stahleckeriidae. Therefore, the Stahleckeriidae may not have had its origin in Africa as previously assumed, but in Central Asia. More importantly, Sungeodon also suggests that the major radiation of kannemeyeriiform dicynodonts, including the emergence of all relevant subgroups of this clade, occurred not later than in the Early Triassic, soon after the end-Permian extinction. To date, only few dicynodont taxa are known from the earliest Triassic, none of which are kannemeyeriiforms. The addition of Sungeodon confirms previous predictions that our knowledge of Early Triassic dicynodont diversity and evolution is far from being complete, and that new discoveries from historically low-sampled geographic regions may fill this gap. A rapid post-extinction diversification of kannemeyeriiforms also fits with the emerging picture from other clades, such as archosaurs, of a rapid recovery from the end-Permian event in the terrestrial realm. © 2014 E. Source

Maisch M.W.,Hartmeyerstr. 6
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2014

A partial mandible of a tapirid perissodactyl and a proboscidean molar determined as Tetralophodon longirostris are described from the basal Kaisiynitsa Formation (Turolian) of the Beli Breg Basin in western Bulgaria. The tapirid is the first record of this family (generally a rare component of Late Miocene European land mammal faunas) from the Beli Breg Basin. The specimen can be determined as Tapirus arvernensis Croizet & Jobert, 1828, but also shows some clear resemblance to Tapirus balkanicus SpaSSov & GinSburG, 1999. The stratigraphic significance of mammalian fossils from the Beli Breg Basin is briefly discussed and it is concluded that they point to a Turolian age of the basal Kaisiynitsa Formation, concurring with recent studies on the fossil flora of the basin. © 2014 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany. Source

Maisch M.W.,Hartmeyerstr. 6
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2014

A sauropterygian skull from the uppermost Buntsandstein (earliest Anisian, uppermost Röt-Formation, Cölestinschichten) of Wogau (Thuringia, eastern Germany) is described in detail and assigned to a new species of Cymatosaurus, Cymatosaurus erikae. Cymatosaurus erikae n. sp. differs from all other species of the genus by a unique combination of dental and cranial features, including nasals that do not reach the external naris or the anterior margin of the orbit, frontals that do not enter the orbital margin and closely approach but do not enter the temporal fenestra, at least two maxillary teeth anterior to the fangs, a long parietal that extends up to the orbit and narrows posteriorly without forming a sagittal crest, unfused vomers, narrow and elongate palatines, and inclined quadrates and quadrate condyles. The new specimen shows a completely closed palate as in nothosaurids, but retains an open occiput. A small lacrimal (recorded here for the first time in Cymatosaurus) is probably present. These features are plesiomorphic for sauropterygians. This combination of features makes it conceivable that Cymatosaurus might actually be a stem-nothosaur rather than a stem plesiosaur, as previously suggested. A phylogenetic analysis of Cymatosaurus species indicates that C. erikae is the sister-taxon of C. latifrons and C. fridericianus. Cymatosaurus gracilis (Schrammen, 1899) is reconsidered and re-established as a valid species of the genus, contrary to previous suggestions. © 2014 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany. Source

Matzke A.T.,Hartmeyerstr. 6 | Maisch M.W.,Am Stadtgraben 3
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2011

Two associated cervical paramedian osteoderms and one isolated paramedian osteoderm of an aetosaur from the famous Trossingen Plateosaurus Quarry are described. They represent the first evidence of aetosaurs from Trossingen as well as the stratigraphically youngest remains of this group from Germany. Therefore, the Trossingen assemblage consists now of four species level taxa. Hitherto only three species level taxa were known from this quarry. Plateosaurus longiceps and Proganochelys quenstedti from complete specimens as well as one tooth of cf. Liliensternus. The finds indicate that more small- to medium-sized taxa may be present in the Trossingen Quarry. ©2011 E. Schweizerbart'sche Verlagsbuchhandlung Stuttgart Germany. Source

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