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Late Miocene potamarchine rodents from southwestern Amazonia, Brazil - with description of new taxa

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Kerber L., Negri F. R., Ribeiro A. M., Vucetich M. G., De Souza-Filho J. P.

Acta Palaeontologica Polonica

2016

tom 61

nr 1

The fossil rodents from the southwestern Amazonia of Brazil have been studied since the first half of the 20th century. Several caviomorph rodents were reported for the Neogene of this region, mainly neoepiblemids and dinomyids. Until recently, the record of dinomyids in the Solimões Formation (Late Miocene) was predominantly based on a few isolated teeth, which made it difficult to make more accurate taxonomic identifications due to the scarcity of diagnostic characters. Here, new remains, more complete than those previously reported, of potamarchine dinomyids from the Neogene of Brazil are described. A new species of Potamarchus and a new genus and species of a Potamarchinae are erected. In addition, new material of Potamarchus murinus and Potamarchus sp. is identified. These data suggest a higher diversity of dinomyids in in the western Amazonia than previously supposed.

Tanystropheid archosauromorphs in the Lower Triassic of Gondwana

100%

De Oliveira T. M., Oliveira D., Schultz C. L., Kerber L., Pinheiro F. L.

Acta Palaeontologica Polonica

2018

tom 63

nr 4

Tanystropheidae is a clade of early archosauromorphs with a reported distribution ranging from the Early to the Late Triassic of Asia, Europe, and North America. Although some specimens with possible tanystropheid affinities from the Lower Triassic beds of Brazil have been previously attributed to “Protorosauria”, little is known about the tanystropheid record in Gondwana. Here, two new and one previously reported specimen from the Sanga do Cabral Formation (Induan–Olenekian) of Brazil are described and interpreted as ?Tanystropheidae. These records, together with other tetrapods previously reported for the Sanga do Cabral Formation, increase the knowledge of the biotic diversification during the beginning of the Triassic. This contribution reinforces that the archosauromorph diversification occurred shortly after the Permo-Triassic extinction, making the Sanga do Cabral Formation an important unit for the study of early Mesozoic faunas.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Kerber L.

1 De Oliveira T. M.

1 De Souza-Filho J. P.

1 Negri F. R.

1 Oliveira D.

1 Pinheiro F. L.

1 Ribeiro A. M.

1 Schultz C. L.

1 Vucetich M. G.

1 2018

1 2016

Wyniki wyszukiwania

Late Miocene potamarchine rodents from southwestern Amazonia, Brazil - with description of new taxa

Tanystropheid archosauromorphs in the Lower Triassic of Gondwana