Abstract

PAGANI, María Alejandra. Carboniferous and Permian bivalves from Patagonia (Chubut, Argentina): Part VI: families Aviculopectinidae, Deltopectinidae and Schizodidae. Ameghiniana [online]. 2006, vol.43, n.2, pp.461-476. ISSN 1851-8044.

A thorough systematic analysis is performed on the bivalve fauna of the Upper Paleozoic of the Tepuel-Genoa Basin (Chubut Province Argentina), as a contribution to the knowledge of early Permian faunas of Argentina. This fourth part comprises the families Aviculopectinidae, Deltopectinidae and Schizodidae, of which abundant well preserved specimens allowed the recognition of three new species, Limipecten herrerai nov. sp., Streblopteria lagunensis n. sp. and Streblopteria minuta n. sp. Two new records of Aviculopecten sp. and Aviculopecten? sp. are included too. On the basis of new material from the Tepuel-Genoa Basin, the diagnoses of Orbiculopecten parma González and Schizodus paucus González are emended. In addition, the descriptions of these and other previously known species are supplemented by new information and their geographical ranges are expanded. Detailed comparisons of all species with taxa from other regions are also provided. A new record of Schizodus sp. is discussed too.

Keywords : Bivalves; Systematics; Carboniferous; Permian; Tepuel-Genoa Basin; Patagonia; Argentina.