WFS News: A high-latitude fauna of mid-Mesozoic mammals from Yakutia, Russia

@WFS,World Fossil Society, Riffin T Sajeev,Russel T Sajeev

A high-latitude fauna of mid-Mesozoic mammals from Yakutia, Russia

Citation: Averianov A, Martin T, Lopatin A, Skutschas P, Schellhorn R, Kolosov P, et al. (2018) A high-latitude fauna of mid-Mesozoic mammals from Yakutia, Russia. PLoS ONE 13(7): e0199983. https://doi.org/10.1371/journal.pone.0199983

Editor: Anthony Fiorillo, Perot Museum of Nature and Science, UNITED STATES

Teeth of Stegosauria indet. (a, b), Ornithischia indet. (c-e), and Eleutherodontidae indet. cf. Sineleutherus sp. (f, g). a, b, ZIN PH 1/246, in occlusal (a) and labial or lingual (b) views. c-e, ZIN PH 2/246, in occlusal (c), lingual (d), and mesial or distal (e) views. f, g, PIN 5614/4, left upper molariform tooth, in labial (f) and occlusal (g) views. Scale bars equal 1 mm.

Teeth of Stegosauria indet.(a, b), Ornithischia indet. (c-e), and Eleutherodontidae indet. cf. Sineleutherus sp. (f, g). a, b, ZIN PH 1/246, in occlusal (a) and labial or lingual (b) views. c-e, ZIN PH 2/246, in occlusal (c), lingual (d), and mesial or distal (e) views. f, g, PIN 5614/4, left upper molariform tooth, in labial (f) and occlusal (g) views. Scale bars equal 1 mm.

The Early Cretaceous (?Berriasian-Barremian) Teete vertebrate locality in Western Yakutia, East Siberia, Russia, has produced mammal remains that are attributed to three taxa: Eleutherodontidae indet. cf. Sineleutherus sp. (Haramiyida; an upper molariform tooth), Khorotherium yakutensis gen. et sp. nov. (Tegotheriidae, Docodonta; maxillary fragment with three molariform teeth and dentary fragment with one molariform tooth), and Sangarotherium aquilonium gen. et sp. nov. (Eutriconodonta incertae sedis; dentary fragment with one erupted molariform tooth and one tooth in crypt). This is the second occurrence of Mesozoic mammals in high latitudes (paleolatitude estimate N 63–70°) of the Northern Hemisphere. In spite of the presumed Early Cretaceous age based on freshwater mollusks, the Teete mammal assemblage has a distinctive Jurassic appearance, being most similar to the Middle-Late Jurassic mammal assemblages known from Siberia, Russia and Xinjiang, China. The smooth transition from Jurassic to Cretaceous biota in Northern Asia is best explained by stable environmental conditions.

@WFS,World Fossil Society, Riffin T Sajeev,Russel T Sajeev

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