Basal turtle material from the Lower Cretaceous of Yakutia (Russia) filling the gap in the Asian record

Pavel P. Skutschas, Valentina D. Markova, Veniamin V. Kolchanov, Alexander O. Averianov, Thomas Martin, Rico Schellhorn, Petr N. Kolosov, Dmitry V. Grigoriev, Dmitry D. Vitenko, Ekaterina M. Obraztsova, Igor G. Danilov

Research outputpeer-review

Abstract

This paper describes fragmentary turtle material (isolated basisphenoid, shell bones, humerus and ilium) from the Lower Cretaceous (Berriasian–Barremian) Teete locality in Yakutia (Eastern Siberia, Russia). All the material is attributed to one taxon of basal turtles (Mesochelydia indet.), based on the morphology of the basisphenoid, shell bones and humerus, as well as microanatomy and histology of the shell bones and humerus. Canals and foramina of the basisphenoid of this taxon revealed by CT scanning show an unusual pattern, which allows various interpretations and suggests a higher diversity of carotid and/or vidian systems in basal turtles than hitherto believed. Mesochelydia indet. from Teete fills an Early Cretaceous gap in the record of Asian basal turtles and represents the northernmost Asian non-marine turtle occurrence of the Mesozoic. All in all, the record of Asian basal turtles appears to be wider geographically and more complete temporally than previously thought. The Asian basal turtles are represented by at least three phylogenetic lineages: primitive Testudinata in the Late Triassic, primitive Mesochelydia from the Early Jurassic to the Early Cretaceous and primitive Perichelydia from the Middle Jurassic to the Late Cretaceous. The presence of such a primitive (Jurassic level) turtle in Teete supports the hypothesis that the vast territory of Siberia was a refugium for Jurassic vertebrate faunal elements. Details of the external morphology and histology of the Teete turtle material as well as its high paleolatitude occurrence argue in favor of its aquatic lifestyle.

Original languageEnglish
Article number104186
JournalCretaceous Research
Volume106
Early online dateAug 2019
DOIs
Publication statusE-pub ahead of print - Aug 2019

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turtle
Cretaceous
Jurassic
bone
histology
shell
material
paleolatitude
refugium
lifestyle
canal
vertebrate
Triassic
fill
phylogenetics

Scopus subject areas

  • Paleontology

Cite this

Skutschas, Pavel P. ; Markova, Valentina D. ; Kolchanov, Veniamin V. ; Averianov, Alexander O. ; Martin, Thomas ; Schellhorn, Rico ; Kolosov, Petr N. ; Grigoriev, Dmitry V. ; Vitenko, Dmitry D. ; Obraztsova, Ekaterina M. ; Danilov, Igor G. / Basal turtle material from the Lower Cretaceous of Yakutia (Russia) filling the gap in the Asian record. In: Cretaceous Research. 2020 ; Vol. 106.
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abstract = "This paper describes fragmentary turtle material (isolated basisphenoid, shell bones, humerus and ilium) from the Lower Cretaceous (Berriasian–Barremian) Teete locality in Yakutia (Eastern Siberia, Russia). All the material is attributed to one taxon of basal turtles (Mesochelydia indet.), based on the morphology of the basisphenoid, shell bones and humerus, as well as microanatomy and histology of the shell bones and humerus. Canals and foramina of the basisphenoid of this taxon revealed by CT scanning show an unusual pattern, which allows various interpretations and suggests a higher diversity of carotid and/or vidian systems in basal turtles than hitherto believed. Mesochelydia indet. from Teete fills an Early Cretaceous gap in the record of Asian basal turtles and represents the northernmost Asian non-marine turtle occurrence of the Mesozoic. All in all, the record of Asian basal turtles appears to be wider geographically and more complete temporally than previously thought. The Asian basal turtles are represented by at least three phylogenetic lineages: primitive Testudinata in the Late Triassic, primitive Mesochelydia from the Early Jurassic to the Early Cretaceous and primitive Perichelydia from the Middle Jurassic to the Late Cretaceous. The presence of such a primitive (Jurassic level) turtle in Teete supports the hypothesis that the vast territory of Siberia was a refugium for Jurassic vertebrate faunal elements. Details of the external morphology and histology of the Teete turtle material as well as its high paleolatitude occurrence argue in favor of its aquatic lifestyle.",
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author = "Skutschas, {Pavel P.} and Markova, {Valentina D.} and Kolchanov, {Veniamin V.} and Averianov, {Alexander O.} and Thomas Martin and Rico Schellhorn and Kolosov, {Petr N.} and Grigoriev, {Dmitry V.} and Vitenko, {Dmitry D.} and Obraztsova, {Ekaterina M.} and Danilov, {Igor G.}",
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Basal turtle material from the Lower Cretaceous of Yakutia (Russia) filling the gap in the Asian record. / Skutschas, Pavel P.; Markova, Valentina D.; Kolchanov, Veniamin V.; Averianov, Alexander O.; Martin, Thomas; Schellhorn, Rico; Kolosov, Petr N.; Grigoriev, Dmitry V.; Vitenko, Dmitry D.; Obraztsova, Ekaterina M.; Danilov, Igor G.

In: Cretaceous Research, Vol. 106, 104186, 02.2020.

Research outputpeer-review

TY - JOUR

T1 - Basal turtle material from the Lower Cretaceous of Yakutia (Russia) filling the gap in the Asian record

AU - Skutschas, Pavel P.

AU - Markova, Valentina D.

AU - Kolchanov, Veniamin V.

AU - Averianov, Alexander O.

AU - Martin, Thomas

AU - Schellhorn, Rico

AU - Kolosov, Petr N.

AU - Grigoriev, Dmitry V.

AU - Vitenko, Dmitry D.

AU - Obraztsova, Ekaterina M.

AU - Danilov, Igor G.

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AB - This paper describes fragmentary turtle material (isolated basisphenoid, shell bones, humerus and ilium) from the Lower Cretaceous (Berriasian–Barremian) Teete locality in Yakutia (Eastern Siberia, Russia). All the material is attributed to one taxon of basal turtles (Mesochelydia indet.), based on the morphology of the basisphenoid, shell bones and humerus, as well as microanatomy and histology of the shell bones and humerus. Canals and foramina of the basisphenoid of this taxon revealed by CT scanning show an unusual pattern, which allows various interpretations and suggests a higher diversity of carotid and/or vidian systems in basal turtles than hitherto believed. Mesochelydia indet. from Teete fills an Early Cretaceous gap in the record of Asian basal turtles and represents the northernmost Asian non-marine turtle occurrence of the Mesozoic. All in all, the record of Asian basal turtles appears to be wider geographically and more complete temporally than previously thought. The Asian basal turtles are represented by at least three phylogenetic lineages: primitive Testudinata in the Late Triassic, primitive Mesochelydia from the Early Jurassic to the Early Cretaceous and primitive Perichelydia from the Middle Jurassic to the Late Cretaceous. The presence of such a primitive (Jurassic level) turtle in Teete supports the hypothesis that the vast territory of Siberia was a refugium for Jurassic vertebrate faunal elements. Details of the external morphology and histology of the Teete turtle material as well as its high paleolatitude occurrence argue in favor of its aquatic lifestyle.

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