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!
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Bivalvia | Venerida | Cyrenoidea | Cyrenoididae | Polymesoda placens nominal species Cyrena placens Hanley, 1844 Hanley, 1844. Proc. Zool. Soc. London 1844: 160.
 Hanley, 1856. Illustr. Descr. Cat. Rec. Bivalve Shells: 352, pl. 14, fig. 52. = Polymesoda placens Taxonomic Opinions= Cyanocyclas placens (Hanley, 1844) — Simone, 2006 = Polymesoda (s.s.) placens (Hanley, 1844) — Martens, 1900 = Cyrena placens Hanley — Clessin, 1877 = Cyrena placens Hanley — Prime, 1870 = Cyrena placens Hanley — Prime, 1865 = Cyrena placens Hanl. — Hanley, 1856 = Cyrena placens Hanley, 1844 — Deshayes, 1855
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