The multituberculate Catopsalis from the early Paleocene of the Crazy Mountains Basin in Montana

• Autorzy: Buckley G A
• Języki publikacji: EN

Abstrakty

EN

A new species of the taeniolabidid multituberculate Catopsalis is described from the Simpson Quarry fauna of the Puercan age Bear Formation of the Crazy Mountains Basin, south-central Montana. The molars retain a conservative cusp formula, yet are distinct from those of other early members of the genus in their extremely large size, which is approximately the same as that of C. calgariensis from the late Torrejonian to early Tiffanian. The combination of apomorphic and plesiomorphic features in the new species indicates a greater degree of complexity in the evolution of the genus than previously recognized.

PL

W oparciu o trzy zęby trzonowe z wczesnopaleoceńskiej (Puercan NALMA, PU2/3) formacji Bear z basenu Crazy Mountains płd. części centralnej Montany opisano nowy gatunek Catopsalis waddleae sp. n. wieloguzkowca z rodziny Taeniolabididae Granger & Simpson 1929. Catopsalis jest rodzajem definiowanym przez cechy plezjomorficzne, wskutek czego jego monofiletyzm jest niepewny i często poddawany w wątpliwość. Jako gatunek C. waddleae sp. n. odróżnia się od innych zaliczanych do rodzaju Catopsalis swoistą kombinacją cech plezjomorficznych zębów z ich dużymi rozmiarami, które to rozmiary uznano za nową cechę gatunku. Zęby C. waddleae sp. n. osiągają w już puerkanie wielkość charkterystyczną dla młodszego stratygraficznie paleoceńskiego (późny Torrejonian po wczesny Tiffanian) gatunku C. calgariensis, świadcząc o większym niż sądzono wcześniej zróżnicowaniu wewnątrz rodzaju Catopsalis.

Słowa kluczowe

PL

zeby trzonowe; Montana; skamienialosci; Taeniolabididae; wieloguzkowce; paleobiologia; Catapsalis waddleae; zroznicowanie wewnatrzgatunkowe; paleogen

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1995
• Tom: 40
• Numer: 4
• Opis fizyczny: s.389-398,fot.,rys.,bibliogr.

Twórcy

autor

Buckley G A

• Department of Geology, Field Museum of Natural History, Roosevelt Road at Lakeshore Drive, chicago, Illinois, 60605, USA

Bibliografia

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