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Abstract
Fourteen Bivalvia species are described from the Lower Permian Río Genoa Formation, exposed in the southern Tepuel-Genoa Basin (Chubut Province, Argentina), of which one, Fletcheripecten genoensis, is new. The studied specimens are well preserved, retaining fine details of the ornament and shell morphology. Palaeotaxodonta is represented by two species of Nuculopsis and four species of Phestia; Pteriomorphia by five species in five genera; and Heteroconchia by three informal species. Most of the species recorded also occur in the northern part of Tepuel-Genoa Basin and allow demarcation of new and distinct marine intervals in the Río Genoa Formation, which was classically interpreted to represent continental deposits. The bivalve fauna confirms a Cisuralian (Early Permian) age for the Río Genoa Formation and offers potential for improved regional and global correlations.
Acknowledgements
We thank reviewers M. Hautmann and A. Biakov, who greatly helped to improve the paper. We also extend our gratitude to Editor S. McLoughlin for his valuable comments and improving the English text. Fieldwork was supported by the Museo Paleontológico ‘Egidio Feruglio’ (Trelew) and the ANPCyT (Argentina) through the Project PICT 33080 ‘Quantitave paleobiogeographic analysis of bivalve and cephalopod fauna from upper Palaeozoic of Tepuel-Genoa Basin (Patagonia, Argentina)’. We are grateful to I. Escapa, P. Puerta, M. Caffa and L. Canessa for their help during fieldwork. Many thanks are expressed to Mr E. Ruigomez (MEF Collection Manager) for his help in the laboratory and collections, and to L. Canessa who prepared the specimens and casts. We are grateful to Raquel Guterman for improving the English text. Our thanks are also extended to the Museo Paleontologico ‘Egidio Feruglio’ (MEF), which provided laboratory and logistic facilities.