Freshwater gastropods from Early Eocene Difunta Group, northeastern Mexico
1992; Cambridge University Press; Volume: 66; Issue: 4 Linguagem: Inglês
10.1017/s002233600002446x
ISSN1937-2337
AutoresFrancisco J. Vega, María del Carmen Perrilliat,
Tópico(s)Aquatic Invertebrate Ecology and Behavior
ResumoThree 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.
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