species Anodontites trapesialis (Lamarck, 1819): synonymy

Anodonta sinuosa Lamarck, 1819

Bruguière, 1797. Encycl. Méth. 2: pl. 203 [204], fig. 2a-b [as Anodontites sp.].
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 87, sp. 14.
POSSIBLE SYNTYPE MNHN_MPL_0009, [unknown].

Glabaris (s.s.) sinuosus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) sinuosus — Simpson (1914)
Anodontites sinuosus — Marshall (1915)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta exotica Lamarck, 1819

Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 87, sp. 12.
POSSIBLE SYNTYPE MNHN_MPL_0007, de Amérique de Sud acheté de la vente de M. Faujas St. Frond [South America purchased from Mr. Faujas St. Frond] “Paratype” according to Johnson (1952).

Glabaris (s.s.) trapesialis var. exoticus — Simpson (1900)
Anodonta exotica — Corsi (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. exoticus — Simpson (1914)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites exotica — Pilsbry (1933)
Glabaris trapesialis — Modell (1942)
Anodontites (s.s.) trapesialis trapesialis — Figueiras (1965)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta trapesialis Lamarck, 1819

Schröter, 1779. Gesch. Flußconch.: pl. 3, fig. 1.
Martini & Chemnitz, 1785. Conchyl. Cab. 8: 185, pl. 86, fig. 762.
Bruguière, 1797. Encycl. Méth. 2: pl. 205, fig. 1a-b [as Anodontites sp.].
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 87, sp. 11.
LECTOTYPE [AS HOLOTYPE] & PARALECTOTYPE MHNG_MOLL_50581 (by R.I. Johnson, 1953: 94), Unknown.

Glabaris (s.s.) trapesialis — Simpson (1900)
Glabaris trapezialis [sic] — Ihering (1910)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites trapezialis [sic] — Marshall (1915), H.B. Baker (1930)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Figueiras (1965), Haas (1969)
Glabaris trapesialis — Modell (1942)
Anodontites (Pachyanodon) trapezialis trapezialis [sic] — Morretes (1949)
Anodontites trapesialis — Lucena (1951), R.I. Johnson (1951), Simone (1994), Graf (2000), Martinez et al. (2004), ... Campbell & Lydeard (2026), Martínez et al. (2026), Prié et al. (2026), Barraza et al. (2026), Li et al. (2026)
Anodontites trapesialis trapesialis — Mansur & Valer (1992), Ramírez et al. (2003)
Anodontites (s.s.) trapesialis — Rumi et al. (2008), Pereira et al. (2014), Torres et al. (2018)

Anodonta trapezialis ‘Lamarck’ of Authors

(error for Anodonta trapesialis Lamarck, 1819)
‘Lamarck’ of Authors.
Blainville, 1825. Manuel Malacol. et Conch.: 538.
Bory de St. Vincent, 1827. Encycl. Méth. 2: 147.
Menke, 1828. Syn. Method. Moll.: 63.
Menke, 1830. Syn. Method. Moll.: 106.
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 93.
d’Orbigny, 1835. Mag. Zool. 5(61-62): 43.
Lea, 1836. Synopsis Fam. Naiades: 53.
Lea, 1838. Synopsis Fam. Naiades: 31.
Swainson, 1840. Treat. Malacol.: 287.
Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 220.
d’Orbigny, 1846. Voyage dans l’Amérique Méridionale 5(3): 596.
Lea, 1852. Synopsis Fam. Naiades: 52.
Hupé, 1857. [in] Castelnau, Anim. Nouv. Rares d’Amer. Sud: 85.
Adams & Adams, 1857. Gen. Rec. Moll. 2(31-32): 504.
Lea, 1870. Synopsis Fam. Naiades: 82.
Ihering, 1893. Arch. Naturg. 59(1): 135.
Corsi, 1900. Anais Mus. Nac. Montevideo 2: 456.
Marshall, 1915. Proc. U.S. Nat. Mus. 49(2122): 529.
Haas, 1929. Senckenbergiana 11: 340.
H.B. Baker, 1930. Occ. Pap. Mus. Zool. Univ. Mich. (210): 70.
Morretes, 1949. Arqu. Mus. Paranaense 7: 27.
Prié et al., 2026. Environmental DNA 8: Table S1.

Glabaris (s.s.) trapesialis — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon anserinus Spix in Wagner, 1827

Spix in Wagner, 1827. Test. Fluv. Brasil.: 29, pl. 21, figs. 1-2.

Glabaris (s.s.) trapesialis var. anserinus — Simpson (1900)
Anodonta exotica — Corsi (1900)
Anodontites trapezialis [sic] var. anserinus — F. Baker (1913)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. anserinus — Simpson (1914)
Anodontites (s.s.) trapesialis anserina — Ortmann (1921)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites (Pachyanodon) trapezialis [sic] anserina — Morretes (1949)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta glauca Valenciennes, 1827

Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 87. [nomen nudum]
Valenciennes, 1827. Receuil Observ. Zool. 2(11-12): 236, pl. 50, fig. 2.
LECTOTYPE [AS HOLOTYPE] MHNG-MOLL-50591 (by R.I. Johnson, 1953: 90), Acapulco.

Glabaris (s.s.) glaucus — Simpson (1900)
Anodonta (Patularia) glauca — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) glaucus — Simpson (1914)
Leila (Pseudoleila) trapezialis [sic]-glauca — Frierson (1927)
Anodontites trapezialis [sic] glaucus — Haas (1929)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontoides glauca — Contreras-Arquieta (2000)
Anodontites trapesialis — Cummings et al. (2025)

Anodon radiatus Spix in Wagner, 1827

Spix in Wagner, 1827. Test. Fluv. Brasil.: 31, pl. 23, fig. 1.
LECTOTYPE ZSM_MOL_20041234 (by Fechter, 1983: 236), Staat Minas Gereas, Brasilien.

Glabaris (s.s.) radiatus — Simpson (1900)
Anodonta exotica — Corsi (1900)
Anodontites (s.s.) (Group of A. trapesialis) radiatus — Simpson (1914)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006), Nagel (2025)

Anodon giganteus Spix in Wagner, 1827

Bruguière, 1797. Encycl. Méth. 2: pl. 205, fig. 1a-b [as Anodontites sp.].
Spix in Wagner, 1827. Test. Fluv. Brasil.: 27, pl. 19, figs. 1-2.
LECTOTYPE ZSM_MOL_20041225 (by Fechter, 1983: 227-229), Rio Solimões.

Glabaris (s.s.) trapesialis — Simpson (1900)
Anodonta exotica — Corsi (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites trapesialis trapesialis — Mansur & Valer (1992), Ramírez et al. (2003)
Anodontites trapesialis — Simone (1994), Simone (2006), Nagel (2025)

Anodon susannae Gray in Griffith & Pidgeon, 1833

Gray in Griffith & Pidgeon, 1833. [in] Cuvier, Animal Kingdom 12(38): pl. 24, fig. 1 [as ‘susannæ’].
Gray in Griffith & Pidgeon, 1834. [in] Cuvier, Animal Kingdom 12(39-40): 595 [as ‘susannæ].

Glabaris (s.s.) trapesialis — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites (s.s.) exoticus susannae — Haas (1931), Haas (1969)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970), Rumi et al. (2008)
Anodontites trapesialis — Simone (1994), Simone (2006)
Anodontites trapesialis trapesialis — Ramírez et al. (2003)

Anodon penicillatus Gray, 1834

Gray, 1834. Proc. Zool. Soc. London 1834: 57.

Glabaris (s.s.) trapesialis — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites (s.s.) exoticus susannae — Haas (1931), Haas (1969)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon sinuosis Swainson, 1841

(error for Anodonta sinuosa Lamarck, 1819)
‘Lamarck’ Swainson, 1841. Ex. Conch.: 29, pl. 16.

Glabaris (s.s.) sinuosus — Simpson (1900)
Anodonta (Pseudoleila) ciconia — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) sinuosus — Simpson (1914)

Anodonta nicaraguae Philippi, 1849

Philippi, 1849. Zeitschr. f. Malakozool. 5(9): 130.
LECTOTYPE MALA.2015.0.619.0.MHN (by Haas, 1930: 322), Nicaragua.

Anodonta (Glabaris) nicaragua — Martens (1900)
Leila (Pseudoleila) nicaragua [sic] — Frierson (1927)
Anodontites trapezialis [sic] bridgesii — Haas (1929)
Anodontites (s.s.) trapesialis nicaraguae — Haas (1930)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontites nicaraguae — R.I. Johnson (1951)
Anodontites trapesialis — R.I. Johnson (1951), Cummings et al. (2025), Nagel (2025)

Anodon ciconia Gould, 1851

Gould, 1851. Proc. Boston Soc. Nat. Hist. 4: 92.
LECTOTYPE [AS HOLOTYPE] MCZ_169084 (by R.I. Johnson, 1964: 54), Mexico ?

Glabaris (s.s.) trapesialis — Simpson (1900)
Glabaris (s.s.) glaucus — Simpson (1900)
Anodonta (Pseudoleila) ciconia — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Leila (Pseudoleila) ciconia — Frierson (1927)
Anodontites (s.s.) trapesialis nicaraguae — Haas (1930)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontites trapesialis — Cummings et al. (2025)

Anodonta ciconia ‘Gould’ of Authors

(reference to Anodon ciconia Gould, 1851)
‘Gould’ of Authors.
Carpenter, 1857. Maz. Shells: 117.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 534, pl. 68, 78, figs. 2-2a.
Martens, 1900. Biol. Centr.-Amer., Moll.: 536, pl. 41, fig. 4.

Glabaris (s.s.) glaucus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) glaucus var. sinaloensis — Simpson (1914)

Anodonta burroughiana Chenu, 1858

(misidentified reference to Anodonta burroughiana Lea, 1834)
Chenu, 1858. Illustr. Conchyl.: pl. 3.

Glabaris (s.s.) glaucus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) glaucus — Simpson (1914)

Anodonta forbesiana Lea, 1860

Lea, 1860. Proc. Acad. Nat. Sci. 12: 92.
Lea, 1863. Jour. Acad. Nat. Sci. 5 [O. 10]: 393, pl. 47, fig. 301.
HOLOTYPE USNM_86694, Uruguay River.

Glabaris (s.s.) forbesianus — Simpson (1900)
Anodonta forbesiana — Corsi (1900)
Anodontites (s.s.) (Group of A. trapesialis) forbesianus — Simpson (1914)
Anodontites (s.s.) forbesiana — Ortmann (1921)
Anodontites (s.s.) trapesialis forbesianus — Haas (1931), Figueiras (1965), Haas (1969), Mansur (1970), Quintana (1982)
Anodontites (Pachyanodon) forbesiana — Morretes (1949)
Anodontites trapesialis forbesianus — Schade (1965), Mansur et al. (1988), Ramírez et al. (2003)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon scriptus G.B. Sowerby II, 1867

‘Férussac’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 4, sp. 9.
HOLOTYPE BMNH_1964370, Hab._?

Glabaris (s.s.) trapesialis var. scriptus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. scriptus — Simpson (1914)
Anodontites (s.s.) trapesialis scripta — Ortmann (1921)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites (Pachyanodon) trapezialis [sic] scripta — Morretes (1949)
Leila blainvilliana — Veitenheimer (1973), Ramírez et al. (2003)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon subsinuatus G.B. Sowerby II, 1867

G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 7, sp. 14.

Glabaris (s.s.) trapesialis var. scriptus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. scriptus — Simpson (1914)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Leila blainvilliana — Veitenheimer (1973)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon areolatus G.B. Sowerby II, 1867

(homonym of Anodon areolatus Swainson, 1829)
G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 10, sp. 28.

Glabaris (s.s.) trapesialis var. scriptus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. scriptus — Simpson (1914)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon exoticus G.B. Sowerby II, 1867

(homonym of Anodonta exotica Lamarck, 1819; renamed Leila grayana Frierson, 1922)
‘Gray’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 16, sp. 57.
HOLOTYPE BMNH_1965207, Rio de la Plata.

Glabaris (s.s.) moricandii — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) moricandii — Simpson (1914)
Leila grayana — Frierson (1922)
Anodontites trapesialis — Simone (1994)

Anodon gigantea ‘Lea’ of Authors

(misidentified reference to Anodonta gigantea Lea, 1838)
‘Lea’ of Authors.
‘Lea’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 8, sp. 19, fig. 18.
H. Adams, 1867. Proc. Zool. Soc. London 1866: 444 [as ‘Leila gigantea’].
Sowerby, 1870. Conch. Icon. 17: pl. 36, sp. 152 [as ‘A. trapezialis Lamarck’].

Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta bridgesii Lea, 1868

Lea, 1868. Proc. Acad. Nat. Sci. 20: 95.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 291 [51], pl. 42, fig. 104.
LECTOTYPE [AS HOLOTYPE] USNM_86691 (by R.I. Johnson, 1951: 81), Lake Nicaragua.

Glabaris (s.s.) bridgesii — Simpson (1900)
Anodonta (Glabaris) nicaragua — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) bridgesii — Simpson (1914)
Leila (Pseudoleila) nicaragua [sic] — Frierson (1927)
Anodontites trapezialis [sic] bridgesii — Haas (1929)
Anodontites (s.s.) trapesialis nicaraguae — Haas (1930)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontites nicaraguae — R.I. Johnson (1951)
Anodontites trapesialis — Cummings et al. (2025)

Anodonta jewettiana Lea, 1868

Lea, 1868. Proc. Acad. Nat. Sci. 20: 95.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 289, pl. 41, fig. 101 [as ‘jewettii’].
HOLOTYPE (MONOTYPY) USNM_86681, Lake Nicaragua.

Glabaris (s.s.) jewittianus [sic] — Simpson (1900)
Anodonta (Glabaris) jewettii — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) jewettianus — Simpson (1914)
Leila (Pseudoleila) nicaragua [sic] — Frierson (1927)
Anodontites nicaraguae — R.I. Johnson (1951)
Anodontites (s.s.) trapesialis glaucus — Haas (1969)
Anodontites trapesialis — Bieler (2021), Cummings et al. (2025)

Anodonta jewettii Lea, 1868

(error for Anodonta jewettiana Lea, 1868)
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 289, pl. 41, fig. 101.
OBJECTIVE SYNONYM USNM_86681, Lake Nicaragua.

Glabaris (s.s.) jewittianus [sic] — Simpson (1900)
Anodonta (Glabaris) jewettii — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) jewettianus — Simpson (1914)
Leila (Pseudoleila) nicaragua [sic] — Frierson (1927)
Anodontites (s.s.) trapesialis nicaraguae — Haas (1930)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontites nicaraguae — R.I. Johnson (1951)
Anodontites trapesialis — Bieler (2021), Cummings et al. (2025)

Anodonta gigantea ‘Spix’ of Authors

(reference to Anodon giganteus Spix in Wagner, 1827)
‘Spix’ of Authors.
Martens, 1868. Malak. Blatt. 15: 196.
Clessin, 1888. Malak. Blatt. 10: 171.

Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)
Anodontites trapesialis — Mansur & Pereira (2006)

Anodonta exotica ‘Lamarck’ of Authors

(reference to Anodonta exotica Lamarck, 1819)
‘Lamarck’ of Authors.
Martens, 1868. Malak. Blatt. 15: 197.
Pilsbry & Rush, 1896. Nautilus 10: 81.

Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)

Anodonta wallisi Mousson, 1869

Mousson, 1869. Malak. Blatt. 16: 188.
SYNTYPE ZMZ_531839, Puerto Nacional, New Grenada.

Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)

Anodon rioplatensis Sowerby, 1870

Sowerby, 1870. Conch. Icon. 17: pl. 26, sp. 101 [as ‘Rio-Platensis’].

Glabaris (s.s.) trapesialis var. rioplatensis — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. rioplatensis — Simpson (1914)
Anodontites (s.s.) rioplatensis — Ortmann (1921)
Anodontites (s.s.) trapesialis forbesianus — Haas (1931), Figueiras (1965), Haas (1969), Mansur (1970), Quintana (1982)
Anodontites trapesialis — Simone (1994), Simone (2006)
Anodontites trapesialis trapesialis — Ramírez et al. (2003)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Anodon glaucus ‘Valenciennes’ of Authors

(reference to Anodonta glauca Valenciennes, 1827)
‘Valenciennes’ of Authors.
Sowerby, 1870. Conch. Icon. 17: pl. 27, sp. 105.
Clessin, 1876. Conchyl. Cab.: 222, pl. 73, fig. 4.

Glabaris (s.s.) glaucus — Simpson (1900)
Anodonta (Pseudoleila) ciconia — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) glaucus var. sinaloensis — Simpson (1914)
Leila (Pseudoleila) ciconia — Frierson (1927)

Anodonta nicaragua Philippi of Authors

(error for Anodonta nicaraguae Philippi, 1849)
Philippi of Authors.
Tate, 1870. Amer. J. Conch. 5: 161.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [7].
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 932.
Haas, 1930. Senckenbergiana 12(6): 324.

Anodonta bahiensis Clessin, 1873

‘Küster’ Clessin, 1873. Conchyl. Cab. 9(1): 94, pl. 20, fig. 2.

Glabaris (s.s.) trapesialis var. scriptus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. scriptus — Simpson (1914)
Anodontites (s.s.) trapesialis scripta — Ortmann (1921)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta angustata Clessin, 1876

Clessin, 1876. Conchyl. Cab.: 226, pl. 74, figs. 6-7.

Glabaris (s.s.) moricandii — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) moricandii — Simpson (1914)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta glauca var. B sinaloensis Crosse & Fischer, 1884

(intro'd as intra-sp. of Anodonta glauca Valenciennes, 1827)
Crosse & Fischer, 1884. J. de Conch. 31: 219.
SYNTYPE MNHN_IM-2000-1707, Rio Presidio, pres Mazatlan, etat de Sinaloa, Mexique.

Glabaris (s.s.) glaucus var. sinaloensis — Simpson (1900)
Anodonta (Pseudoleila) ciconia — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) glaucus var. sinaloensis — Simpson (1914)
Leila (Pseudoleila) ciconia — Frierson (1927)
Anodontites trapezialis [sic] sinaloensis — Haas (1929)
Anodontites (s.s.) trapesialis nicaraguae — Haas (1930)
Anodontites (s.s.) trapesialis glaucus — Haas (1931), Haas (1969)
Anodontites sinaloensis — Contreras-Arquieta (2000)
Anodontites trapesialis — Cummings et al. (2025)

Anodonta riograndensis Ihering, 1890

Ihering, 1890. Arch. Naturg. 56(1): 158.
LECTOTYPE SMF_3838 (by Haas, 1931: 101), Rio Guahyba, Staat Rio Grande do Sul, Brasilien.

Anodontites (s.s.) riograndensis — Ortmann (1921)
Anodontites (s.s.) exoticus susannae — Haas (1931), Haas (1969)
Anodontites (Pachyanodon) riograndensis — Morretes (1949)
Anodontites (s.s.) trapesialis forbesianus — Figueiras (1965), Mansur (1970)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970)
Anodontites trapesialis — Simone (1994), Simone (2006), Mansur & Pereira (2006), Nagel (2025)
Anodontites trapesialis trapesialis — Ramírez et al. (2003)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Glabaris simpsonianus Pilsbry, 1896

Pilsbry, 1896. Proc. Acad. Nat. Sci. 48: 564, pl. 27, fig. 13.
FIGURED SYNTYPE ANSP_41845, Rio de la Plata.

Glabaris (s.s.) simpsonianus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) simpsonianus — Simpson (1914)
Anodontites (s.s.) exoticus susannae — Haas (1931), Haas (1969)
Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970)
Anodontites trapesialis — Simone (1994), Simone (2006)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Glabaris trapesialis var. cygneiformis Pilsbry, 1896

(intro'd as intra-sp. of Anodonta trapesialis Lamarck, 1819)
Pilsbry, 1896. Proc. Acad. Nat. Sci. 48: 563, pl. 26, figs. 5-6.
SYNTYPES ANSP_69741, pond, near Maldonado, Uruguay.

Glabaris (s.s.) trapesialis var. cygnæformis [sic] — Simpson (1900)
Anodonta trapezialis v. cigneiformis [sic] — Corsi (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. cygnæformis [sic] — Simpson (1914)
Anodontites (s.s.) exoticus susannae — Haas (1931), Haas (1969)
Anodontites (s.s.) trapesialis forbesianus — Figueiras (1965), Mansur (1970), Quintana (1982)
Anodontites (s.s.) trapesialis susannae — Bonetto & Mansur (1970)
Anodontites trapesialis — Simone (1994), Simone (2006)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Glabaris (s.s.) umbonatus Simpson, 1900

‘Gould’ Sowerby, 1870. Conch. Icon. 17: pl. 29, sp. 115, fig. 115b [as ‘Anodon ciconia’]. [in part]
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 926, footnote.
Simpson, 1914. Descr. Cat. Naiades: 1436.

Glabaris (s.s.) umbonatus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) umbonatus — Simpson (1914)
Anodontites (s.s.) trapesialis forbesianus — Haas (1969)

Anodonta jewittiana ‘Lea’ of Authors

(error for Anodonta jewettiana Lea, 1868)
‘Lea’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 927.
Frierson, 1927. Check List N. Amer. Naiades: 97.

Anodontites (s.s.) (Group of A. trapesialis) jewettianus — Simpson (1914)

Anodonta jewittii ‘Lea’ of Authors

(error for Anodonta jewettii Lea, 1868)
‘Lea’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 927.
Frierson, 1927. Check List N. Amer. Naiades: 97.
‘Lea’ Haas, 1931. Senckenbergiana 13: 99.

Glabaris dulcis Ihering, 1910

Ihering, 1910. Abh. Senckenb. Naturf. Ges. 32: 132, pl. 12, figs. 5a-b.
LECTOTYPE SMF_3841 (by Zilch, 1967: 130), Fazenda do Sacramento, Mun. de Sao Domingo do Prata, Minas Gereas, Geb. des Rio Doce.

Glabaris dulcis — Ihering (1910)
Anodontites (s.s.) (Group of A. trigonus) dulcis — Simpson (1914)
Anodontites (s.s.) exoticus exoticus — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006), Nagel (2025)

Anodontites aurora Marshall, 1915

Marshall, 1915. Proc. U.S. Nat. Mus. 49(2122): 529, pl. 69.
HOLOTYPE (ORIG. DESIG.) USNM_273689, Ceara, Brazil.

Anodontites aurora — Marshall (1915)
Anodontites (Styganodon) aurora — Morretes (1949)
Anodontites (s.s.) exoticus exoticus — Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodontites salmonea Marshall, 1915

Marshall, 1915. Proc. U.S. Nat. Mus. 49(2122): 528, pl. 67.
HOLOTYPE (ORIG. DESIG.) USNM_273688, Ceara, Brazil.

Anodontites salmonea — Marshall (1915)
Anodontites (Styganodon) crispata salmonea — Morretes (1949)
Anodontites (s.s.) patagonicus patagonicus — Haas (1969)
Anodontites trapesialis — Simone (2006)

Anodontites darochai Marshall, 1915

Marshall, 1915. Proc. U.S. Nat. Mus. 49(2122): 528, pl. 68.
HOLOTYPE (ORIG. DESIG.) USNM_273687, Ceara, Brazil.

Anodontites darochai — Marshall (1915)
Anodontites (Pachyanodon) trapezialis [sic] darochai — Morretes (1949)
Anodontites (s.s.) exoticus exoticus — Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Leila grayana Frierson, 1922

(new name for Anodon exoticus G.B. Sowerby II, 1867)
‘Gray’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 16, sp. 57.
Frierson, 1922. Nautilus 36: 9.

Leila grayana — Frierson (1922)
Anodontites trapesialis — Simone (2006)

Anodontites flucki Walker, 1924

Walker, 1924. Nautilus 38(2): 53, pl. 1, figs. 3-4.
HOLOTYPE (ORIG. DESIG.) UMMZ_112641, Wanks River (Rio Coco), near Sang Sangta, Nicaragua.

Anodontites (s.s.) trapesialis glaucus — Haas (1969)
Anodontites trapesialis — Cummings et al. (2025)

Anodontites marcusi Mendes, 1939

Mendes, 1939. Bol. Biol. São Paulo 4: 481, 5 Abb.

Anodontites (s.s.) exoticus susannae — Haas (1969)
Anodontites trapesialis — Simone (1994), Simone (2006)

Anodonta trapezia ‘Küster’ of Authors

(error for Anodonta trapezialis ‘Lamarck’ of Authors)
‘Küster’ of Authors.

Anodonta exotica Cuvier, 1817

(reference to Anodonta exotica Lamarck, 1819)
‘Lamarck’ Cuvier, 1817. Règne Animal 2: pl. 90, figs. 1-1a.

Unio (Anodontes) exotica var. A elongata d’Orbigny, 1835

(intro'd as intra-sp. of Anodonta exotica Lamarck, 1819; homonym of Anodon elongatus Swainson, 1823)
d’Orbigny, 1835. Mag. Zool. 5(61-62): 39 [as ‘Var. A’].

Anodontites trapesialis — Simone (1994), Simone (2006)

Unio (Anodontes) exotica var. C larga d’Orbigny, 1835

(intro'd as intra-sp. of Anodonta exotica Lamarck, 1819)
d’Orbigny, 1835. Mag. Zool. 5(61-62): 39 [as ‘Var. C’].

Anodontites trapesialis — Simone (1994), Simone (2006)

Unio (Anodontes) exotica var. B oblonga d’Orbigny, 1835

(intro'd as intra-sp. of Anodonta exotica Lamarck, 1819)
d’Orbigny, 1835. Mag. Zool. 5(61-62): 39 [as ‘Var. B’].

Anodontites trapesialis — Simone (1994), Simone (2006)

Iridina trapezialis d’Orbigny, 1846

(reference to Anodonta trapesialis Lamarck, 1819)
d’Orbigny, 1846. Voyage dans l’Amérique Méridionale 5(3): 596.

Anodonta esula Gray, 1847

(misidentified reference to Iridina esula d’Orbigny, 1835)
‘Orb.’ Gray, 1847. Proc. Zool. Soc. London 15: 197.

Anodontites trapesialis — Simone (1994), Simone (2006)

Anodon pencillatus Lea, 1852

(error for Anodon penicillatus Gray, 1834)
‘Gray’ Lea, 1852. Synopsis Fam. Naiades: 52.
‘Gray’ Lea, 1870. Synopsis Fam. Naiades: 83.

Anodon blainvilleana G.B. Sowerby II, 1867

(error for Anodonta blainvilliana Lea, 1834; misidentified reference to Anodonta blainvilliana Lea, 1834)
‘Lea’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 6, sp. 12.

Glabaris (s.s.) trapesialis — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis — Simpson (1914)
Anodontites (s.s.) trapesialis trapesialis — Haas (1931), Haas (1969)
Anodontites trapesialis — Simone (2006)

Anodon moretonianus G.B. Sowerby II, 1867

(error for Anodonta mortoniana Lea, 1834; misidentified reference to Anodonta mortoniana Lea, 1834)
‘Lea’ G.B. Sowerby II, 1867. Conch. Icon. 17: pl. 9, sp. 21, fig. 20.

Glabaris (s.s.) trapesialis var. moretonianus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. moretonianus — Simpson (1914)
Anodontites (s.s.) trigona — Ortmann (1921)
Anodontites trapesialis — Simone (1994)

Anodon ciconia Sowerby, 1870

(reference to Anodon ciconia Gould, 1851)
‘Gould’ Sowerby, 1870. Conch. Icon. 17: pl. 29, sp. 115, fig. 115a. [in part]

Glabaris (s.s.) trapesialis var. rioplatensis — Simpson (1900)
Anodonta (Pseudoleila) ciconia — Martens (1900)
Anodontites (s.s.) (Group of A. trapesialis) trapesialis var. rioplatensis — Simpson (1914)
Leila (Pseudoleila) ciconia — Frierson (1927)

Anodon ciconia Sowerby, 1870

(reference to Anodon ciconia Gould, 1851)
‘Gould’ Sowerby, 1870. Conch. Icon. 17: pl. 29, sp. 115, fig. 115b. [in part]

Glabaris (s.s.) umbonatus — Simpson (1900)
Anodontites (s.s.) (Group of A. trapesialis) umbonatus — Simpson (1914)

Anodonta anserina Clessin, 1873

(reference to Anodon anserinus Spix in Wagner, 1827)
‘Spix’ Clessin, 1873. Conchyl. Cab. 9(1): 80, pl. 20, fig. 1.

Anodonta trapezialis Doering, 1875

(error for Anodonta trapesialis Lamarck, 1819; reference to Anodonta trapesialis Lamarck, 1819)
‘Lamarck’ Doering, 1875. Periód. Zool. 2: 46.
Ihering, 1890. Arch. Naturg. 56(1): 147, 157.

Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Glabaris susannae Ihering, 1893

(reference to Anodon susannae Gray in Griffith & Pidgeon, 1833)
‘Gray’ Ihering, 1893. Arch. Naturg. 59(1): 118.

Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)
Anodontites trapesialis forbesianus — Ramírez et al. (2003)

Glabaris trapesialis var. cygnaeformis Simpson, 1900

(error for Glabaris trapesialis var. cygneiformis Pilsbry, 1896)
‘Pilsbry’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 925.
‘Pilsbry’ Simpson, 1914. Descr. Cat. Naiades: 1432.

Anodontites trapesialis — Simone (1994)

Anodonta troperziali, var. exotica Corsi, 1900

(reference to Anodonta exotica Lamarck, 1819)
‘Lamarck’ Corsi, 1900. Anais Mus. Nac. Montevideo 2: 456, fig. 37.

Anodontites (s.s.) riograndensis — Ortmann (1921)
Anodontites (s.s.) trapesialis forbesianus — Mansur (1970)

Anodonta trapezialis v. cigneiformis Corsi, 1900

(error for Glabaris trapesialis var. cygneiformis Pilsbry, 1896)
‘Pilsbry’ Corsi, 1900. Anais Mus. Nac. Montevideo 2: 455.

Anodonta troperziali Corsi, 1900

(error for Anodonta trapesialis Lamarck, 1819)
‘Lamarck’ Corsi, 1900. Anais Mus. Nac. Montevideo 2: 456.

Anodon auserinus Corsi, 1900

(error for Anodon anserinus Spix in Wagner, 1827)
‘Spix’ Corsi, 1900. Anais Mus. Nac. Montevideo 2: 456.

Glabaris trapesialis var. cygneyformis Ramírez et al., 2003

(error for Glabaris trapesialis var. cygneiformis Pilsbry, 1896)
‘Pilsbry’ Ramírez et al., 2003. Rev. Biol. Trop. 51: 273.

Anodontites susanae Simone, 2006

(error for Anodon susannae Gray in Griffith & Pidgeon, 1833)
‘Gray’ Simone, 2006. Land. Freshw. Moll. Brazil.: 282.