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Freshwater gastropods from Early Eocene Difunta Group, northeastern Mexico

Published online by Cambridge University Press:  20 May 2016

Francisco J. Vega
Affiliation:
Instituto de Geología, Universidad Nacional Autónoma de México
Maria del Carmen Perrilliat
Affiliation:
Instituto de Geología, Universidad Nacional Autónoma de México

Abstract

Three new species of freshwater gastropods are described from the lower Eocene Adjuntas Formation. Five more species are reported from the same fauna. This is the first report of Tertiary freshwater Mollusca of the Campanian–lower Eocene Difunta Group. The three new species (Hemisinus (Longiverena) reticulosus, Hemisinus (Longiverena) adjuntaensis, and Melanatria ypresiana) belong to the family Thiaridae, which today is a worldwide distributed group of freshwater gastropods of medical importance. Paleoenvironmental interpretation for red, green, and yellow beds of Adjuntas Formation suggests delta-plain deposits. Gastropods here described lived in swamps and marshes of this portion of the ancestral Gulf of Mexico.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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