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[dinosaur] Khorotherium and Sangarotherium, new mammals from Early Cretaceous of Siberia (free pdf)

Ben Creisler

New in PLoS ONE:

Khorotherium yakutensis gen. et sp. nov.

Sangarotherium aquilonium gen. et sp. nov.Â

Alexander Averianov, Thomas Martin, Alexey Lopatin, Pavel Skutschas, Rico Schellhorn, Petr Kolosov& Dmitry Vitenko (2018)
A high-latitude fauna of mid-Mesozoic mammals from Yakutia, Russia.
PLoS ONE 13(7): e0199983.
doi:Â https://doi.org/10.1371/journal.pone.0199983


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 63â70Â) 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.