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Unionidae
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Species & Genus Richness offreshwater musselsby Taxonomy
Species & Genus Richness offreshwater bivalves by Family
North America
Central America
South America
Afrotropics
North Eurasia
East Asia
Australasia
Species Richness & Endemism offreshwater mussels by Geography
Data last updated Mon 2 March 2026
Bivalvia | ... | Unionoidea | Unionidae | Ambleminae | Popenaiadini | Sphenonaias opacata
Sphenonaias opacata (Crosse & Fischer, 1894), Lago de Catamaco, S shore, on knoll, ca. 5 km W Juarez, Veracruz, Mexico 18° 21’ 54” N, 95° 04’ 15” W