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The largest Cretaceous podocnemidoid turtle (Pleurodira) revealed by an isolated plate from the Bauru Basin, south-central Brazil

Texto completo
Autor(es):
Hermanson, Guilherme ; Ferreira, Gabriel S. ; Langer, Max C.
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: HISTORICAL BIOLOGY; v. 29, n. 6, p. 833-840, 2017.
Citações Web of Science: 0
Resumo

The Bauru Basin (south-central Brazil) fossils have largely contributed to understand the faunal composition of South American Cretaceous. Among those, several turtle specimens were retrieved from those deposits, all belonging to Podocnemidoidae, the single group known from the Basin. On the other hand, only incomplete shell elements indicate large turtles such as `Peiropolis A'. Another shell fragment, a large peripheral plate from the Marilia Formation, is described here. Its lack of surface ornamentation, and deep sulci are generally typical for podocnemidoids. The plate exhibits a narrow knob slightly projected onto the pleuro-marginal sulcus, absent in any other Bauru Basin turtle. According to extant and fossil podocnemidoids measures, we estimated this individual reached 1 m of carapace length, exceeding in size all other taxa known from the Basin. This new report reveals a broader size variation among podocnemidoids from the Late Cretaceous of Bauru Basin and a morphological diversity previously unknown for the period, comparable to those of the Amazon Basin today, in which inhabits the largest extant podocnemidoid Podocnemis expansa. Furthermore, the occurrence of such large turtles implies the presence of perennial streams on the northeastern portion of the Bauru Basin during the Maastrichtian and a richer environment than previously thought. (AU)

Processo FAPESP: 14/03825-3 - A origem e irradiação dos dinossauros no Gondwana (Neotriássico - Eojurássico)
Beneficiário:Max Cardoso Langer
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/25379-5 - Evolução, morfologia e desenvolvimento da região do pterigóide em Testudines com foco em Pleurodira
Beneficiário:Gabriel de Souza Ferreira
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 16/03373-0 - Descrição da anatomia interna do crânio de um Podocnemidoidea (Pleurodira: Pelomedusoides) do Cretáceo de São Paulo
Beneficiário:Guilherme Hermanson Souza
Linha de fomento: Bolsas no Brasil - Iniciação Científica