The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)
FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win!
Search the database pages:
Bivalvia | Sphaerioida | Sphaerioidea | Sphaeriidae | Sphaeriinae | Sphaerium transversum nominal species Sphaerium contractum Prime, 1865  Prime, 1865. Smithsonian Misc. Coll. (145): 48, fig. 46.
= Sphaerium transversum Taxonomic Opinions+ Musculium partumeium (Say, 1822) — Mackie, 2007 + Musculium transversum (Say, 1829) — Mackie, 2007 + Musculium transversum (Say, 1829) — Burch, 1975 + Sphaerium partumeium (Say, 1822) — Herrington, 1962 + Sphærium transversum Say — Prime, 1895 = Sphærium contractum Prime — Prime, 1870 = Sphærium contractum Prime — Prime, 1865
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