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Author	F.P. Wesselingh
Title	On relict hydrobiid species in Brazilian Amazonia (Gastropoda, Prosobranchia, Hydrobiidae)
Journal	Basteria
Volume	64
Year	2000
Pages	129-136
ISSN	0005-6219
Keywords	South America; Amazonia; Miocene; Recent; Hydrobiidae; Dyris; Sioliella; new species
Abstract	Two extant hydrobiid species from the lower Tapajos river of Brazil are redescribed. Potamopyrgus amazonicus Haas, 1949, is assigned to the genus Dyris Conrad, 1871. At least eleven species from Miocene deposits of Western Amazonia are assigned to Dyris, a genus that was previously assumed to be extinct. The apertural features of Sioliella effusa Haas, 1949, are considered indicative of a close relationship to Miocene Amazonian taxa formaly assigned to Eubora Kadolsky, 1980. Sioliella ovata spec. nov., a Miocene species resembling S. effusa is described. The two Tapajos species can be regarded as relicts of a speciose, endemic, Miocene Western Amazonian molluscan fauna.
Classification	42.73 ; 38.22
Document type	article
Download paper	http://www.repository.naturalis.nl/document/54012