Anodon rotundus Wagner, 1827
Spix in Wagner, 1827. Test. Fluv. Brasil.: 28, pl. 20, figs. 2-4.
Type(s): SYNTYPE SMF_3809, Brasilien, Staat Sao Paulo.

Glabaris (s.s.) rotundus — Simpson (1900)
Anodontites (s.s.) rotundus — Simpson (1914)
Anodontites (s.s.) trapezea — Ortmann (1921)
Anodontites (s.s.) trapezeus — Haas (1931), Figueiras (1965), Haas (1969), Mansur (1970)
Anodontites trapezeus — Mansur et al. (1988), Ramírez et al. (2003), Simone (2006)

Anodon trapezeus Wagner, 1827
Spix in Wagner, 1827. Test. Fluv. Brasil.: 28, pl. 20, fig. 1.
Type(s): HOLOTYPE ZSM_MOLL_20041232, Rio Solimoes, Brazil.

Glabaris (s.s.) patagonicus — Simpson (1900)
Glabaris trapezea — Ihering (1910)
Anodontites (s.s.) patagonicus — Simpson (1914)
Anodontites (s.s.) trapezea — Ortmann (1921)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1949), Figueiras (1965), Haas (1969), Mansur (1970), Rumi et al. (2008), Pereira et al. (2014), Torres et al. (2018)
Anodontites (Styganodon) trapezeus — Morretes (1949)
Anodontites trapezia [sic] — Lucena (1951)
Anodontites trapezeus — Mansur et al. (1988), Ramírez et al. (2003), Simone (2006), Mansur & Pereira (2006), Graf & Cummings (2007), Lasso et al. (2009), Bogan (2010), Mansur et al. (2020)
Anodontites trapezea — Graf & Cummings (2021), Torres et al. (2024)

Unio (Anodontes) spixii d’Orbigny, 1835
d’Orbigny, 1835. Mag. Zool. 5(61-62): 39.

Glabaris spixii — Simpson (1900)
Anodontites (s.s.) spixii — Simpson (1914), Figueiras (1965)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Anodon trapezius Lea, 1836
‘Spix & Wagner’ of Authors.
Lea, 1836. Synopsis Fam. Naiades: 53.
Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 221.
Lucena, 1951. Pap. Avuls. Dept. Zool. 10(3): 98.

Anodonta cailliaudii Lea, 1860
Lea, 1860. Proc. Acad. Nat. Sci. 12: 308.
Lea, 1863. Jour. Acad. Nat. Sci. 5 [O. 10]: 395 [31], pl. 45, fig. 297.
Type(s): HOLOTYPE USNM_86705, Brazil.

Glabaris (s.s.) rotundus — Simpson (1900)
Anodontites (s.s.) rotundus — Simpson (1914)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (s.s.) spixii — Figueiras (1965)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Anodonta rubicunda Lea, 1860
Lea, 1860. Proc. Acad. Nat. Sci. 12: 92.
Lea, 1863. Jour. Acad. Nat. Sci. 5 [O. 10]: 392, pl. 46, fig. 299.
Type(s): HOLOTYPE USNM_86401, Uruguay River.

Glabaris (s.s.) rubicundus — Simpson (1900)
Anodonta rubicunda — Corsi (1900)
Anodontites (s.s.) rubicundus — Simpson (1914)
Anodontites (s.s.) patagonica rubicunda — Ortmann (1921)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (Pachyanodon) patagonica rubicunda — Morretes (1949)
Anodontites (s.s.) patagonicus — Figueiras (1965)
Anodontites (s.s.) patagonicus patagonicus — Bonetto & Mansur (1970)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Anodonta pazii Lea, 1866
Lea, 1866. Proc. Acad. Nat. Sci. 18: 35.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 274, pl. 36, fig. 87.
Type(s): HOLOTYPE USNM_86703, So. Am.

Glabaris (s.s.) pazii — Simpson (1900)
Anodontites (s.s.) pazii — Simpson (1914)
Anodontites (s.s.) patagonica rubicunda — Ortmann (1921)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (s.s.) spixii — Figueiras (1965)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Glabaris trapezea var. caipira Ihering, 1893
Ihering, 1893. Arch. Naturg. 59(1): 58.
Type(s): HOLOTYPE SMF_3829, Rio Piracicaba, Staat Sao Paulo, Brasilien.

— Simpson (1914)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Glabaris trapezea var. sowerbyana Ihering, 1893
Ihering, 1893. Arch. Naturg. 59(1): 58.
Type(s): HOLOTYPE SMF_3830, Brasilien.

— Simpson (1914)
Anodontites (s.s.) trapezeus — Haas (1931), Haas (1969), Mansur (1970)
Anodontites (s.s.) trapezeus spixii — Quintana (1982)
Anodontites trapezeus — Ramírez et al. (2003), Simone (2006)

Anodonta trapezium of Authors, unknown year
‘Mori.’ of Authors.

Anodon caillaudii Sowerby, 1867
‘Lea’ Sowerby, 1867. Conch. Icon. 17: pl. 12, sp. 38.

Glabaris (s.s.) rotundus — Simpson (1900)
Anodontites (s.s.) trapezeus — Mansur (1970)

Anodon parii Sowerby, 1870
‘Lea’ Sowerby, 1870. Conch. Icon. 17: index.

Anodonta cailludi Ramírez et al., 2003
‘Lea’ Ramírez et al., 2003. Rev. Biol. Trop. 51: 273.

Anodontites sowerbiana Simone, 2006
‘Ihering’ Simone, 2006. Land. Freshw. Moll. Brazil.: 283.