A new relict stem salamander from the Early Cretaceous of Yakutia, Siberian Russia

• Autorzy: Skutschas P.P. , Kolchanov V.V. , Averianov A.O. , Martin T. , Schellhorn R. , Kolosov P.N. , Vitenko D.D.
• Języki publikacji: EN

Abstrakty

EN

A new stem salamander, Kulgeriherpeton ultimum gen. et sp. nov., is described based on a nearly complete atlas from the Lower Cretaceous (Berriasian–Barremian) Teete vertebrate locality in southwestern Yakutia (Eastern Siberia, Russia). The new taxon is diagnosed by the following unique combination of atlantal characters: the presence of a transversal ridge and a depression on the ventral surface of the posterior portion of the centrum; ossified portions of the intercotylar tubercle represented by dorsal and ventral lips; the absence of a deep depression on the ventral surface of the anterior portion of the centrum; the absence of pronounced ventrolateral ridges; the absence of spinal nerve foramina; the presence of a pitted texture on the ventral and lateral surfaces of the centrum and lateral surfaces neural arch pedicels; the presence of a short neural arch with its anterior border situated far behind the level of the anterior cotyles; moderately dorsoventrally compressed anterior cotyles; and the absence of a deep incisure on the distal-most end of the neural spine. The internal microanatomical organization of the atlas is characterized by the presence of a thick, moderately vascularized cortex and inner cancellous endochondral bone. The recognition of stem salamanders and other vertebrates with Jurassic affinities in the Early Cretaceous high-latitude (paleolatitude estimate N 63–70°) vertebrate assemblage of Teete suggests that: (i) the large territory of present day Siberia was a refugium for Jurassic relicts; (ii) there were no striking differences in the composition of high-latitude Yakutian and mid-latitude Western Siberian Early Cretaceous vertebrate assemblages; and (iii) there was a smooth transition from the Jurassic to Cretaceous biotas in North Asia.

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2018
• Tom: 63
• Numer: 3
• Opis fizyczny: p.519-525,fig.,ref.

Twórcy

autor

Skutschas P.P.

• Vertebrate Zoology Department, Saint Petersburg State University, Universitetskaya nab. 7/9, 199034 Saint Petersburg, Russia

autor

Kolchanov V.V.

• Vertebrate Zoology Department, Saint Petersburg State University, Universitetskaya nab. 7/9, 199034 Saint Petersburg, Russia

autor

Averianov A.O.

• Zoological Institute of the Russian Academy of Sciences, Universitetskaya nab. 1, 199034 Saint Petersburg, Russia
• Institute of Earth Sciences, Saint Petersburg State University, 16 Liniya VO 29, 199178 Saint Petersburg, Russia; Institute of Geology and Petroleum Technology, Kazan Federal University, Kremlevskaya str. 4/5, 420008 Kazan, Russia

autor

Martin T.

• Steinmann-Institut fur Geologie, Mineralogie und Palaontologie, Universitat Bonn, Nussallee 8, 53115 Bonn, Germany

autor

Schellhorn R.

• Steinmann-Institut fur Geologie, Mineralogie und Palaontologie, Universitat Bonn, Nussallee 8, 53115 Bonn, Germany

autor

Kolosov P.N.

• Institute of Diamond and Precious Metals Geology, Siberian Branch of the Russian Academy of Sciences, pr. Lenina 39, 677980 Yakutsk, Russia

autor

Vitenko D.D.

• Vertebrate Zoology Department, Saint Petersburg State University, Universitetskaya nab. 7/9, 199034 Saint Petersburg, Russia

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Identyfikatory

DOI

10.4202/app.00498.2018