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The sphenacodontid synapsid Neosaurus cynodus, and related material, from the Permo-Carboniferous of France

100%

Falconnet J.

Acta Palaeontologica Polonica

2015

tom 60

nr 1

Sphenacodontid synapsids were major components of early Permian ecosystems. Despite their abundance in the North American part of Pangaea, they are much rarer in Europe. Among the few described European taxa is Neosaurus cynodus, from the La Serre Horst, Eastern France. This species is represented by a single specimen, and its validity has been questioned. A detailed revision of its anatomy shows that sphenacodontids were also present in the Lodève Basin, Southern France. The presence of several synapomorphies of sphenacodontids—including the teardrop-shaped teeth—supports the assignment of the French material to the Sphenacodontidae, but it is too fragmentary for more precise identification. The discovery of sphenacodontids in the Viala Formation of the Lodève Basin provides additional information about their ecological preferences and environment, supporting the supposed semi-arid climate and floodplain setting of this formation. The Viala vertebrate assemblage includes aquatic branchiosaurs and xenacanthids, amphibious eryopoids, and terrestrial diadectids and sphenacodontids. This composition is very close to that of the contemporaneous assemblages of Texas and Oklahoma, once thought to be typical of North American lowland deposits, and thus supports the biogeographic affinities of North American and European continental early Permian ecosystems.

A new basal sphenacodontid synapsid from the Late Carboniferous of the Saar-Nahe Basin, Germany

80%

Frobisch J., Schoch R., Muller J., Schindler T., Schweiss D.

Acta Palaeontologica Polonica

2011

tom 56

nr 1

A new basal sphenacodontid synapsid, represented by an anterior portion of a mandible, demonstrates for the first time the presence of amniotes in the largest European Permo−Carboniferous basin, the Saar−Nahe Basin. The new taxon, Cryptovenator hirschbergeri gen. et sp. nov., is autapomorphic in the extreme shortness and robustness of the lower jaw, with moderate heterodonty, including the absence of a greatly reduced first tooth and only a slight caniniform development of the second and third teeth. Cryptovenatorshares with Dimetrodon, Sphenacodon, and Ctenospondylus, but notably not with Secodontosaurus, enlarged canines and a characteristic teardrop outline of the marginal teeth in lateral view, possession of a deep symphyseal region, and a strongly concave dorsal margin of the dentary. The new find shows that sphenacodontids were present in the Saar−Nahe Basin by the latest Carboniferous, predating the record of sphenacodontid tracks from slightly younger sediments in this region.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Falconnet J.

1 Frobisch J.

1 Muller J.

1 Schindler T.

1 Schoch R.

1 Schweiss D.

1 2015

1 2011

Wyniki wyszukiwania

The sphenacodontid synapsid Neosaurus cynodus, and related material, from the Permo-Carboniferous of France

A new basal sphenacodontid synapsid from the Late Carboniferous of the Saar-Nahe Basin, Germany