Page last updated
Thu 3 September 2025

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 | Unionoida | Unionoidea | Unionidae | Ambleminae | Pleurobemini

genus Plethobasus Simpson, 1900: synonymy
     3 Recent valid species (5 total species)

Taxonomic History (since 1900)

Unio (s.s.) — Call (1900)
Pleurobema (sec. Plethobasus) — Simpson (1900), Simpson (1914)
Quadrula (sec. Theliderma) — Simpson (1900), Simpson (1914)
Pleurobema — Ortmann (1909), Ortmann (1909), Ortmann (1910), Vanatta (1915)
Quadrula — Ortmann (1909), Ortmann (1909)
Plethobasus — Ortmann (1912), Utterback (1915), Ortmann (1918), Ortmann & Walker (1922), Ortmann (1924), ... Klymus et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)
Unio — de Gregorio (1914), Henderson (1935)
Pleurobema (Plethobasus) — Frierson (1927), Haas (1930)
Quadrula (Striata) — Frierson (1927)
Quadrula (Luteacarnea) — Haas (1969)