On the presence of Eunectes murinus (Squamata, Serpentes) from the late Pleistocene of Northern Brazil

serpentes 0106 biological sciences Eunectes late pleistocene Tocantins state 550 northern Brazil 590 15. Life on land 01 natural sciences Geosciences
DOI: 10.4072/rbp.2013.1.06 Publication Date: 2013-05-15T04:17:46Z
ABSTRACT
Brazilian late Pleistocene snakes have an extensive fossil record and are recognized for southern, northeastern and northern regions of this country. This fossil record is represented by the families Boidae, 'Colubridae', Viperidae and Elapidae. Here is presented the fi rst record for Eunectes Wagler for the late Pleistocene of the Brazilian northern region. The material described is a single incomplete dorsal vertebra, and although it shares several vertebral features with most Boidae taxa, it can be distinguished from all other boids because is a robust and wide vertebra with a slightly depressed neural arch, relatively thick and robust zygosphene with a prominent median turbercle. The taxonomic allocation to E. murinus (Linnaeus) is based on the exceptionally large size of the vertebra. The discovery of E. murinus in the late Pleistocene of Tocantins State indicates the presence of a large body of water in a region that has previously been interpreted as relatively arid during this time. RESUMO - As serpentes do Pleistoceno fi nal do Brasil exibem um amplo registro fossilifero, sendo reconhecidas para as regioes sudeste, nordeste e norte do pais. Esta diversidade e representada pelas familias Boidae, 'Colubridae', Viperidae e Elapidae. Neste trabalho, e apresentado o primeiro registro de Eunectes Wagler para Pleistoceno fi nal da Regiao Norte do Brasil. O material consiste de uma unica vertebra dorsal incompleta e, embora compartilhe muitos caracteres com os demais representantes da familia Boidae, distingue-se de todos eles por exibir uma vertebra robusta e larga, arco neural ligeiramente deprimido, zigosfene robusta e moderadamente espessa, com um proeminente tuberculo mediano. A atribuicao taxonomica a E. murinus (Linnaeus) refere-se ao grande tamanho da vertebra do especime aqui descrito. A descoberta de E. murinus para o Pleistoceno fi nal do Estado de Tocantins indica a presenca de grandes corpos d'agua em uma regiao que foi previamente interpretada como relativamente umida durante esse momento. Palavras-chave: Serpentes, Eunectes, Pleistoceno fi nal, Tocantins, norte do Brasil.
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