MUSSELpdb
Taxonomy
Species & Genus Richness of
freshwater mussels
by Taxonomy
Species & Genus Richness of
freshwater bivalves
by Family
Geography
Species Richness & Endemism of
freshwater mussels
by Geography
Data last updated
Wed 04 February 2026
Bivalvia | Venerida | Cyrenoidea | Cyrenoididae | Polymesoda fontainei
nominal species Cyrena placens Hanley, 1844
Cyrena placens Hanley, 1844 = Polymesoda fontainei
Hanley, 1844. Proc. Zool. Soc. London 1844: 160.
Hanley, 1856. Illustr. Descr. Cat. Rec. Bivalve Shells: 352, pl. 14, fig. 52.
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, 1853
