A new genus of dipnoiformes from the Cretaceous of Brazil

Anais da Academia Brasileira de Ciências

Carlos E.v. Toledo²  Eliane P. De Sousa¹  Manuel A.a. Medeiros¹  Reinaldo J. Bertini¹ 

[1] ,USP IGC GSASão Paulo SP ,Brasil

关键词: Dipnoiformes;    neoceratodontids;    Equinoxiodus alcantarensis gen. et sp. nov.;    Cretaceous;    Dipnoiformes;    neoceratodontídeos;    Equinoxiodus alcantarensis gen. et sp. nov.;    Cretáceo;   

DOI  :  10.1590/S0001-37652011000400006

来源: SciELO

【 摘 要 】

The Alcântara Formation, an important stratigraphic unit from the early Cenomanian of Brazil, was deposited under transitional (estuarine) conditions, and its fossil record includes fragmentary remains of plants, fishes, crocodylomorphs, pterosaurs and dinosaurs, with a noteworthy diversity of dipnoiformes tooth plates. The dipnoiformes material reported here comprises a new taxon, Equinoxiodus alcantarensis, gen. et sp. nov. Most of the identified morphotypes of continental vertebrates collected in the Alcântara Formation are similar to chronocorrelative faunas from Northern Africa, but this new genus of Dipnoiformes indicates some degree of paleogeographic isolation and endemism. This was probably caused by the widening of the equatorial Atlantic Ocean during the early Cenomanian, which may have selectively affected some species.

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