species Plectomerus dombeyanus (Valenciennes in Humboldt & Bonpland, 1827): synonymy

Unio crassidens Lamarck, 1819

Lister, 1685. Conch.: pl. 150, fig. 5.
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 71, sp. 3, var. a. [in part]
(misidentified reference to Unio crassidens Lamarck, 1819)

Quadrula (sec. Crenodonta) trapezoides — Simpson (1900), Simpson (1914)
Unio (s.s.) trapezoides — Call (1900)
Plectomerus trapezoides — Ortmann & Walker (1922)
Amblema (Plectomerus) dombeyana — Frierson (1927)
Plectomerus dombeyana — R.I. Johnson (1969), Oesch (1984)
Plectomerus dombeyanus — Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008)

Unio dombeyana Valenciennes, 1827

Valenciennes, 1827. Receuil Observ. Zool. 2(11-12): 227, pl. 53, figs. 1a-b.

Quadrula (sec. Crenodonta) trapezoides — Simpson (1900), Simpson (1914)
Plectomerus trapezoides — Ortmann & Walker (1922)
Amblema (Plectomerus) dombeyana — Frierson (1927), Haas (1969)
Amblema dombeyana — Thiele (1934)
Plectomerus dombeyanus — Haas (1969), Burch (1975), Gordon et al. (1979), R.I. Johnson (1980), Turgeon et al. (1988), ... FMCS (2021), Stodola et al. (2021), Hopper et al. (2023), Freeman et al. (2025), FMCS (2025)
Amblema dombeyanus — Davis & Fuller (1981)
Plectomerus dombeyana — Oesch (1984), Vidrine (1993)

Bariosta ponderosus Rafinesque, 1831

Rafinesque, 1831. Continuation: 2.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 73.

Bariosta ponderosus — Simpson (1900), Simpson (1914)
Plectomerus trapezoides — Ortmann & Walker (1922)
Amblema (Plectomerus) dombeyana — Frierson (1927)
Plectomerus dombeyanus — Burch (1975), Howells et al. (1996)
Plectomerus dombeyana — Oesch (1984)

Lasmigona ponderosa Rafinesque, 1831

Rafinesque, 1831. Continuation: 5.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 79.

Unio interruptus Say, 1831

Say, 1831. Transylvania J. Med. Assoc. Sci. 4: 525.
Say, 1832. Amer. Conch. 4: pl. 33.
(homonym of Unio (Eurynia) solenoides var. interrupta Rafinesque, 1820)

Quadrula (sec. Crenodonta) trapezoides — Simpson (1900), Simpson (1914)
Plectomerus trapezoides — Ortmann & Walker (1922)
Amblema (Plectomerus) dombeyana — Frierson (1927)
Plectomerus dombeyanus — Haas (1969), Burch (1975), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008)
Plectomerus dombeyana — Oesch (1984)

Unio trapezoides Lea, 1831

Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 69 [79], pl. 3, fig. 1.
Type(s): FIGURED SYNTYPE USNM_84103, Lake St. Joseph, Mis.

Quadrula (sec. Crenodonta) trapezoides — Simpson (1900), Simpson (1914)
Unio (s.s.) trapezoides — Call (1900)
Quadrula trapezoides — Ortmann (1909)
Crenodonta trapezoides — Ortmann (1912)
Plectomerus trapezoides — Ortmann & Walker (1922)
Amblema (Plectomerus) dombeyana — Frierson (1927)
Plectomerus dombeyanus — Haas (1969), Burch (1975), R.I. Johnson (1980), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008), Williams et al. (2014), Graf & Cummings (2021)
Plectomerus dombeyana — Oesch (1984), Vidrine (1993)

Unio dombeiana ‘Valenciennes’ of Authors

‘Valenciennes’ of Authors.
Ferussac, 1835. Mag. Zool. 5(59-60): 27, 33.
Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 175.
(error for Unio dombeyana Valenciennes, 1827)

Quadrula trapezoides var. pentagonoides Frierson, 1902

Frierson, 1902. Nautilus 16(4): 39.
Frierson, 1927. Check List N. Amer. Naiades: 62 [as ‘A. (Plectomerus) dombeyana’].
(intro'd as intra-sp. of Unio trapezoides Lea, 1831)
Type(s): LECTOTYPE ANSP_128928 (by R.I. Johnson, 1972: 147), Lake Charles, La.

Quadrula (sec. Crenodonta) trapezoides var. pentagonoides — Simpson (1914)
Amblema (Plectomerus) dombeyana — Frierson (1927)
Plectomerus dombeyanus — Haas (1969), Parmalee & Bogan (1998)

Complanaria trapezius Agassiz, 1852

Agassiz, 1852. Arch. Naturg. 18(1): 49.
(error for Unio trapezoides Lea, 1831)