Baiotomeus, a new ptilodontid multituberculate (Mammalia) from the middle Paleocene of western North America

Baiotomeus is a new genus of ptilodontid multituberculate from the late Torrejonian Land-Mammal Age (late middle Paleocene) of western North America. Baiotomeus douglassi (Simpson), the type species, has been assigned, at one time or another, to Ptilodus, Mimetodon, and Neoplagiaulax. In addition, a...

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Bibliographic Details
Published in:Journal of paleontology 1987-05, Vol.61 (3), p.595-603
Main Author: Krause, David W.
Format: Article
Language:English
Subjects:
Cheek
Dentition
Fauna
Holotypes
Mammals
Mathematical cusps
National museums
Natural history
Primates
Teeth
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Summary:Baiotomeus is a new genus of ptilodontid multituberculate from the late Torrejonian Land-Mammal Age (late middle Paleocene) of western North America. Baiotomeus douglassi (Simpson), the type species, has been assigned, at one time or another, to Ptilodus, Mimetodon, and Neoplagiaulax. In addition, a second, new species, B. lamberti, from three localities in the Medicine Rocks area of southeastern Montana is reported here. The Medicine Rocks localities are tentatively assigned a latest Torrejonian age, younger than localities yielding B. douglassi and younger than previously suggested on the basis of plesiadapid primates. Multituberculates appear to have attained their highest species richness during the Torrejonian Land-Mammal Age, but the discovery of B. lamberti illustrates that our knowledge of multituberculate diversity is incomplete from even that interval of time.
ISSN:0022-3360
1937-2337
DOI:10.1017/S0022336000028766