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Unionidae
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Species & Genus Richness offreshwater musselsby Taxonomy
Species & Genus Richness offreshwater bivalves by Family
Summary
North America
Central America
South America
Afrotropics
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Species Richness & Endemism offreshwater mussels by Geography
Data last updated Thu 22 January 2026
Clessin, 1874. Bull. Soc. Vaud. Sci. Nat. 13: 149. [nomen nudum]Clessin, 1877. Conch. Cab. 9(3): 71, pl, 8, figs. 19-21.
=
= Pisidium (Gruppe Fossarina) demissum Clessin — Clessin, 1877
= Pisidium demissum sp. nov. — Clessin, 1874