New mammalian remains from the Late Cretaceous La Colonia Formation, Patagonia, Argentina

• Autorzy: Rougier G W , Forasiepi A.M. , Hill R.V. , Novacek M.
• Języki publikacji: EN

Abstrakty

EN

Knowledge of the latest Late Cretaceous mammalian fauna in the South America was, until now, mostly based on dentally known taxa recovered at Los Alamitos (Río Negro, Argentina). Here we describe new mammalian remains collected in outcrops of the La Colonia Formation (Campanian–Maastrichtian) exposed in Chubut Province, Argentina, warranting the recognition of a new mesungulatid: Coloniatherium cilinskii gen. et sp. nov. The mammalian high−level taxonomic compositions of the localities in the La Colonia Formation and at Los Alamitos are roughly similar (Reigitheriidae, Mesungulatidae, and Ferugliotheridae are represented in both localities), but gondwanatheriids and the more plesiomorphic dryolestoids from Los Alamitos are missing from La Colonia. The most abundant mammalian remains collected at La Colonia correspond to large−sized mesungulatids. Coloniatherium cilinskii is recognized by the dentition and lower jaw, and we assign five isolated petrosal bones, focusing our study primarily on the analysis of the ear regions. The morphology of the petrosals suggests a phylogenetic position similar to Vincelestes, but sharing some derived features, possibly convergent, with therians. Attribution of the petrosals to the mesungulatid Coloniatherium cilinskii is supported by overall morphology, size, and relative abundance among the mammalian remains from La Colonia.

Słowa kluczowe

EN

paleontology; mammalian remains; Late Cretaceous; La Colonia Formation; Patagonia; Argentina; mammal fauna; Los Alamitos; Coloniatherium cilinskii; Vincelestes; Mammalia; Mesungulatidae; Cretaceous; new remains; Campanian; Maastrichtian

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2009
• Tom: 54
• Numer: 2
• Opis fizyczny: p.195-212,fig.,ref.

Twórcy

autor

Rougier G W

• Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville KY 40292, USA

autor

Forasiepi A.M.

autor

Hill R.V.

autor

Novacek M.

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