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!
Bivalvia | ... | Unioninae | Unionini | Unio crassus nominal species Unio crassissimus Hanley, 1843 Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33 [as ‘Mysca tumida var. crassissima’]. [nomen nudum]
 ‘Fer.’ Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 209. = Unio crassus Taxonomic Opinions+ Margaritana crassa (Retzius, 1788) — Simpson, 1914 + Margaritana crassa (Retzius, 1788) — Simpson, 1900 + Margaron (Unio) crassus (Retz.) — Lea, 1870 = Unio crassissimus Fer. — Hanley, 1843 = Mysca tumida var. crassissima m. — Schlüter, 1838
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