Bivalvia | Unionida | Unionoidea | Unionidae | Gonideinae | Rectidentini | Contradentina

genus Trapezoideus Simpson, 1900: synonymy

5 Recent freshwater species (5 total species)

Synonymy

Trapezoideus Simpson, 1900

Simpson, 1900. Proc. U.S. Nat. Mus. 22: 858.
Simpson, 1914. Descr. Cat. Naiades: 1180.
Type species: Unio foliaceus Gould, 1843 (orig. desig.) = Trapezoideus foliaceus

Trapezioideus Starobogatov, 1970

‘Simpson’ Starobogatov, 1970. Fauna Moll. Continent.: 61.
(error for Trapezoideus Simpson, 1900)
Type species: Unio foliaceus Gould, 1843 = Trapezoideus foliaceus

Taxonomic History (since 1900)

The Taxonomic History lists the ways authors have classified the species currently assigned to Trapezoideus, since 1900.

Trapezoideus — Simpson (1900), Preston (1912), Simpson (1914), Preston (1915), Haas (1919), ... Zieritz et al. (2024), Wu et al. (2024), Jeratthitikul et al. (2024), Konopleva et al. (2025), Campbell & Lydeard (2026)