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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!

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Bivalvia | Unionida | Unionoidea | Unionidae | Gonideinae | Rectidentini | Rectidentina

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

Rectidens Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 853.
Simpson, 1914. Descr. Cat. Naiades: 1157.
Type species: Unio prolongatus Drouët, 1894 (orig. desig.) = Rectidens sumatrensis

Elongaria Haas, 1911
Haas, 1911. Conch. Cab. 9 (pt. 2, h. 43): pl. 17.
Haas, 1913. Conch. Cab. 9 (pt. 2, h. 48): 167.
Haas, 1913. Nachr. Bl. Dtsch. Malak. Ges. 45: 34.
Type species: Unio orientalis Lea, 1840 (orig. desig.) = Rectidens orientalis

Taxonomic History (since 1900)

Nodularia (s.s.)Simpson (1900)
RectidensSimpson (1900), Frierson (1911), Simpson (1914), Haas (1914), Thiele (1934), ... Chen et al. (2025), Klymus et al. (2025), Zieritz et al. (2026), Campbell & Lydeard (2026), Wu et al. (2026)
Unio (sec. Lymnium)Simpson (1900), Simpson (1914)
UnioMartens (1900), Preston (1912)
Elongaria (s.s.)Haas (1913), Thiele (1934), Haas (1969), Haas (1969)
ElongariaHaas (1940), van Benthem Jutting (1953), Graf & Cummings (2007), Bogan (2010), Affandi et al. (2013), Zieritz et al. (2018), Pfeiffer et al. (2021), Graf & Cummings (2021), Sahidin et al. (2021)

 
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