First ? cimolodontan multituberculate mammal from South America

• Autorzy: Kielan-Jaworowska Z , Ortiz-Jaureguizar E. , Vieytes C. , Pascual R. , Goin F.J.
• Języki publikacji: EN

Abstrakty

EN

We describe a Cretaceous ?cimolodontan multituberculate p4 from South America, for which we erect the new genus and species Argentodites coloniensis. This new taxon is represented by an isolated ?left p4 from the Upper Cretaceous (?Campanian or Maastrichtian) La Colonia Formation of Patagonia (Fig. 1). It has a strongly convex anterior margin and prismatic enamel, which attest to its cimolodontan nature, while the previously known p4 (MACN−RN 975) from the Late Cretaceous Los Alamitos Formation is roughly rectangular, suggesting “plagiaulacidan” affinity. The presence of normal prismatic enamel in Argentodites suggests similarities to Ptilodontoidea. However, it differs from the Late Cretaceous and Paleocene Laurasian cimolodontans (including Ptilodontoidea) in having a long, straight posterior margin, a nearly straight dorsal margin, characteristic of some “Plagiaulacida”, and in having the lingual side close to the mirror image of the labial side, the character that poses difficulties in establishing whether it is a right or left tooth. Because of these differences we assign Argentodites to ?Cimolodonta, tentatively only, superfamily and family incertae sedis.

Słowa kluczowe

EN

Argentina; mammal; Cretaceous; Argentodites coloniensis; new species; new genus; La Colonia Formation; South America; Multituberculata; paleontology; Cimolodonta

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2007
• Tom: 52
• Numer: 2
• Opis fizyczny: p.257-262,fig.,ref.

Twórcy

autor

Kielan-Jaworowska Z

• Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland

autor

Ortiz-Jaureguizar E.

autor

Vieytes C.

autor

Pascual R.

autor

Goin F.J.

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