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A new Pennsylvanian Oriocrassatellinae from Brazil and the distribution of the genus Oriocrassatella in space and time
  • Universidade de São Paulo (USP)
  • Universidade Estadual Paulista (UNESP)
  • Consejo Nacl Invest Cient & Tecn
  • Universidade Federal do Rio Grande do Sul (UFRGS)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Sponsorship Process Number: 
  • CNPq: 59969/92-3
  • CNPq: 483947/2007-5
  • FAPESP: 99/10797-4
Oriocrassatella Etheridge Jr., 1907 is a long range crassatellid bivalve genus well recognized in shallow waters of epeiric seas throughout the upper part of Paleozoic. The first occurrences of this genus are recorded in the sedimentary successions of the Gondwana, both in Australia and South America. However, the geographic and age distribution of Oriocrassatella in Late Mississippian deposits of Australia and Argentina may indicate an earliest Visean or even a pre-Visean origin for the genus. Following its origin in Early Carboniferous a complex paleobiogeographic history from Southern to Northern Hemisphere took place in the Permian. During its initial dispersal phase from Late Carboniferous to the Early Permian the genus thrived in cold water environments associated to the Late Paleozoic Gondwana glaciation. Shallow-water bottoms of the warm waters of the central Gondwana fringe and Laurussia were colonized by Oriocrassatella only during Early Permian times when the genus became cosmopolitan. A new species of this genus is described herein, Oriocrassatella piauiensis n. sp., recorded from the Piaui Formation, Pennsylvanian of the Parnaiba Basin. This new species may represent an early adaptation to warm waters. However, based on available data, species of this genus seem to have adapted definitely to warm water environments probably related the Late Pennsylvanian interglacial phases. In these phases, climatic barrier were interrupted allowing the faunal interchange and larval dispersion following a South to North migration route through the eastern margins of Gondwana and the eastern Paleotethys.
Issue Date: 
Geodiversitas. Paris: Museum Natl Histoire Naturelle, v. 34, n. 3, p. 489-504, 2012.
Time Duration: 
Museum Natl Histoire Naturelle
  • Oriocrassatella
  • bivalve
  • Gondwana
  • Upper Paleozoic
  • glaciation
  • paleobiogeography
  • new species
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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