Diplodon ellipticum Wagner, 1827
Spix in Wagner, 1827. Test. Fluv. Brasil.: 33.
Spix in Wagner, 1827. Test. Fluv. Brasil.: pl. 26, figs. 1-2 [as Diplodon ellypticum].

Diplodon (s.s.) wagnerianum — Simpson (1900)
Diplodon ellipticus — Ihering (1910), Parodiz (1968), Mansur (1970), Simone (2006), Graf & Cummings (2007), Bogan (2010), Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)
Diplodon (s.s.) wagnerianus — Simpson (1914), Thiele (1934)
Diplodon (s.s.) ellipticus — Ortmann (1921), Pereira et al. (2014)
Diplodon (s.s.) granosus ellypticus — Haas (1931), Haas (1969)
Diplodon (s.s.) granosus ellipticus — Bonetto (1964)
Diplodon ellipticum — Graf (2000)
Diplodon wagnerianum — Marshall et al. (2014)

Diplodon ellypticum Wagner, 1827
Spix in Wagner, 1827. Test. Fluv. Brasil.: pl. 26, figs. 1-2.

Diplodon (s.s.) wagnerianum — Simpson (1900)
Diplodon (s.s.) wagnerianus — Simpson (1914)
Diplodon (s.s.) ellipticus — Ortmann (1921)
Diplodon (s.s.) granosus ellypticus — Haas (1931), Haas (1969)
Diplodon ellipticus — Parodiz (1968), Mansur (1970), Simone (2006), Miyahira et al. (2019)
Diplodon (s.s.) ellypticum — Haas (1969)
Diplodon ellipticus [sic] — Bogan (2010)
Diplodon granosus ellypticum — IUCN (2011)

Unio besckeanus Dunker, 1849
Dunker, 1849. Z. Malak. 5(12): 182.
Type(s): TYPE ZMB_108714, Parahiba porta da Cunha, Minas Geraes.

Diplodon (s.s.) beskeanus [sic] — Simpson (1900), Simpson (1914)
Diplodon beskeanus [sic] — Ihering (1910), Figueiras (1965), Parodiz (1968)
Diplodon besckeanus — Haas (1930), Simone (2006), Graf & Cummings (2007), Bogan (2010)
Diplodon (s.s.) besckeanus besckeanus — Morretes (1949), Haas (1969)
Diplodon (s.s.) besckeanus — Pereira et al. (2014)
Diplodon ellipticus — Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)

Diplodon beskeanus Lea, 1852
‘Dunker’ of Authors.
Lea, 1852. Synopsis Fam. Naiades: 39, Corrigenda et Addenda.
Lea, 1870. Synopsis Fam. Naiades: 61.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 875.
Ihering, 1910. Abh. Senckenb. Naturf. Ges. 32: 139.
Figueiras, 1965. Comm. Soc. Malac. Uruguay 1(8): 238.
Parodiz, 1968. Sterkiana 30: 3.

Diplodon ellipticus — Miyahira et al. (2019)

Unio dunkerianus Lea, 1856
Lea, 1856. Proc. Acad. Nat. Sci. 8: 94.
Lea, 1857. Jour. Acad. Nat. Sci. 3 [O. 6]: 305 [25], pl. 28, fig. 20.
Type(s): HOLOTYPE USNM_84155, Rio Grande, New Grenada.

Diplodon (s.s.) atratus — Simpson (1900)
Diplodon (s.s.) dunkerianus — Simpson (1914), Pereira et al. (2014)
Diplodon rhuacoicus — Haas (1930), Simone (2006)
Diplodon (s.s.) rhuacoicus — Figueiras (1965), Haas (1969)
Diplodon parallelipipedon [sic] aethiops — Parodiz (1968)
Diplodon dunkerianus — Mansur (1970), IUCN (1996)
Diplodon ellipticus — Miyahira et al. (2019), Mansur et al. (2020)

Unio rhuaconicus Küster, 1856
‘Pfeiffer teste Charpentier’ Küster, 1856. Conchyl. Cab. 9(2): 145, pl. 42, fig. 5.

Diplodon (s.s.) rhuaconicus — Simpson (1900), Simpson (1914)
Diplodon wheatleyanus — Haas (1930)
Schleschiella burroughiana rhuacoica [sic] — Modell (1950)
Diplodon burroughianus wheatleyanus — Parodiz (1968)
Diplodon (s.s.) wheatleyanus — Haas (1969)
Rhipidodonta burroughiana — Simone (2006)
Diplodon ellipticus — Miyahira et al. (2019)

Unio ellipticus Küster, 1861
‘Spix & Wagner’ of Authors.
Küster, 1861. Conchyl. Cab. 9(2): 238, pl. 80, fig. 2.
‘Spix’ Sowerby, 1868. Conch. Icon. 16: pl. 74, sp. 382.

Diplodon (s.s.) wagnerianum — Simpson (1900)
Diplodon (s.s.) wagnerianus — Simpson (1914)
Diplodon ellipticus — Mansur (1970), Miyahira et al. (2019)

Diplodon (s.s.) wagnerianum Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 877.
Simpson, 1914. Descr. Cat. Naiades: 1246 [as ‘wagnerianus’].

Diplodon (s.s.) wagnerianum — Simpson (1900)
Diplodon (s.s.) wagnerianus — Simpson (1914), Thiele (1934)
Diplodon (s.s.) ellipticus — Ortmann (1921)
Diplodon (s.s.) granosus ellypticus — Haas (1931), Haas (1969)
Diplodon (s.s.) wagnerianus wagnerianus — Morretes (1949)
Diplodon wagnerianus — Bonetto (1959)
Diplodon ellipticus — Parodiz (1968), Mansur (1970), Simone (2006), Miyahira et al. (2019)
Diplodon wagnerianum — Marshall et al. (2014)

Diplodon panco Ihering, 1910
Ihering, 1910. Abh. Senckenb. Naturf. Ges. 32: 132, pl. 12, figs. 6a-b.
Type(s): TYPE SMF_3920, Rio Doce, Staat Espirito Santo, Bras.

Diplodon panco — Ihering (1910), Simpson (1914)
Diplodon besckeanus — Haas (1930), Simone (2006)
Diplodon (s.s.) panco — Morretes (1949)
Diplodon beskeanus [sic] — Parodiz (1968)
Diplodon (s.s.) besckeanus besckeanus — Haas (1969)

Diplodon ellipticus santanus Ihering, 1910
Ihering, 1910. Abh. Senckenb. Naturf. Ges. 32: 134.
Type(s): TYPE SMF_3893, Rio Santa Maria, Nebenfl. d. Rio Doce, Esp. Santo, Bras.

Diplodon ellipticus santanus — Ihering (1910)
Diplodon (s.s.) wagnerianus var. santanus — Simpson (1914)
Diplodon (s.s.) ellipticus — Ortmann (1921)
Diplodon besckeanus — Haas (1930), Simone (2006)
Diplodon (s.s.) wagnerianus santanus — Morretes (1949)
Diplodon ellipticus var. santanus — Bonetto (1959)
Diplodon (s.s.) rhuacoicus — Figueiras (1965)
Diplodon rhombeus — Parodiz (1968)
Diplodon (s.s.) besckeanus besckeanus — Haas (1969)
Diplodon ellipticus — Miyahira et al. (2019)

Diplodon jacksoni Marshall, 1928
Marshall, 1928. Proc. U.S. Nat. Mus. 74(2762): 1, pl. 4, figs. 1-3.
Type(s): HOLOTYPE USNM_368260, Arcas, Minas Geraes, Brazil.

Diplodon (s.s.) granosus ellypticus — Haas (1931), Haas (1969)
Diplodon (s.s.) jacksoni — Morretes (1949)
Diplodon ellipticus — Parodiz (1968), Mansur (1970), Simone (2006)

Unio boscianus Lea, 1852
‘Dunker’ Lea, 1852. Synopsis Fam. Naiades: 39.

Unio rhuacoicus Modell, 1950
‘Küster’ Modell, 1950. Arch. Moll. 79(4/6): 141.

Diplodon magnerianus Simone, 2006
‘Simpson’ Simone, 2006. Land. Freshw. Moll. Brazil.: 257.

Diplodon ellipticus — Simone (2006)