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Multituberculate mammals from the Middle Jurassic of Western Siberia, Russia, and the origin of Multituberculata

Averianov, Alexander O.; Martin, Thomas; Lopatin, Alexey V.; Schultz, Julia A.; Schellhorn, Rico; Krasnolutskii, Sergei; Skutschas, Pavel; Ivantsov, Stepan

Tashtykia primaeva gen. et sp. nov. and Tagaria antiqua gen. et sp. nov. (Multituberculata incertae sedis) are described based on isolated teeth from the Middle Jurassic (Bathonian) Itat Formation from the Berezovsk coal mine in Krasnoyarsk Territory, Western Siberia, Russia. Tashtykia primaeva gen. et sp. nov. is characterized by a P5 with three rows of cusps (cusp formula 2B:4M:6L) and a high sectorial p4 with two triangular lobes, five serrations associated with labial and lingual ridges, and a unique distal cusp. Tagaria antiqua gen. et sp. nov. differs from all other multituberculates by a very long P5 with flat crown and many cusps arranged in three rows (4B:6M:7L). Morphologically the teeth of Kermackodon and Megaconus are transitional between Euharamiyida and Middle Jurassic Multituberculata. Kermackodon shares several characteristics with Euharamiyida, such as pointed cusps on the molars connected by longitudinal ridges, a distolabial cusp on the M2 that is higher than the other cusps, and a single large sectorial premolar (p4) with a distal basin. The euharamiyidan characters of Megaconus are an ultimate upper premolar with a shorter lingual side, a p4 with a distal basin, and one cusp on the molars being larger than the other cusps. In addition, Megaconus shares an ultimate upper premolar with three rows of cusps, horizontal wear on the molars, and pyramidal cusps on the molars separated by transverse grooves with multituberculates. The multituberculate characters of Kermackodon include horizontal rather than basined wear on the surface of the molars and serrations on the p4.

Funding provided by: Deutsche Forschungsgemeinschaft
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100001659
Award Number: MA 1643/14-1, 3

Funding provided by: Russian Foundation for Basic Research
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100002261
Award Number: 11-04-91331-NNIO

Funding provided by: Ministry of Education and Science of the Russian Federation
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100003443
Award Number: 5.4217.2017/4.6

Funding provided by: Russian Science Foundation
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100006769
Award Number: 19-14-00020

Funding provided by: Zoological Institute Russian Academy of Sciences*
Crossref Funder Registry ID:
Award Number: АААА-А17-117022810195-3

Funding provided by: Alexander von Humboldt-Stiftung
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100005156
Award Number: Humboldt Research Award

Funding provided by: Zoological Institute Russian Academy of Sciences
Crossref Funder Registry ID:
Award Number: АААА-А17-117022810195-3

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