Unio multistriatus Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 91, pl. 12, fig. 22.
Type(s): POSSIBLE SYNTYPE USNM_84114, R. Joanes, near Bahia, Brazil.

Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921)
Diplodon multistriatus — Ihering (1910), Bonetto (1959), Simone (2006), Graf & Cummings (2007), Bogan (2010), Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)
Diplodon (s.s.) granosus multistriatus — Haas (1931), Bonetto (1964), Bonetto (1965), Haas (1969), Mansur & Pereira (2006), Rumi et al. (2008)
Diplodon ellipticus — Parodiz (1968), Mansur (1970)
Diplodon granosus multistriatus — IUCN (2011)
Diplodon (s.s.) multistriatus — Pereira et al. (2014)

Unio coriaceus Dunker, 1849
Dunker, 1849. Zeitschr. f. Malakozool. 5(12): 181.
Type(s): TYPE ZMB_108716, [no locality available - South America].

Diplodon (s.s.) coriaceus — Simpson (1900), Simpson (1914)
Diplodon (s.s.) granosus granosus — Haas (1931), Haas (1969)
Diplodon (s.s.) granosus multistriatus — Bonetto (1964)
Diplodon granosus — Parodiz (1968)
Diplodon multistriatus — Simone (2006), Miyahira et al. (2019)

Unio granuliferus Dunker, 1849
Dunker, 1849. Zeitschr. f. Malakozool. 5(12): 182.
Pfeiffer, 1860. Novit. Conch. 2(13): 150, pl. 39, figs. 1, 3.
Type(s): TYPE ZMB_108715, Rio Macacu, Prov. Rio de Janeiro, Distr. Canto Gallo.

Diplodon (s.s.) granuliferus — Simpson (1900), Simpson (1914)
Diplodon (s.s.) granosus granosus — Haas (1931), Haas (1969)
Diplodon (s.s.) granosus multistriatus — Bonetto (1964)
Diplodon granosus — Parodiz (1968), Simone (2006)
Diplodon multistriatus — Miyahira et al. (2019)

Unio effulgens Lea, 1856
Lea, 1856. Proc. Acad. Nat. Sci. 8: 94.
Lea, 1857. Jour. Acad. Nat. Sci. 3 [O. 6]: 303 [23], pl. 28, fig. 18.
Type(s): HOLOTYPE USNM_84406, Brazil.

Diplodon (s.s.) effulgens — Simpson (1900), Simpson (1914)
Diplodon delodontus expansus — Haas (1930)
Diplodon expansus — Parodiz (1968), Mansur (1970), Simone (2006)
Diplodon (s.s.) delodontus expansus — Haas (1969)

Unio expansus Küster, 1856
‘Charpentier mss.’ Küster, 1856. Conchyl. Cab. 9(2): 149, pl. 43, fig. 5.

Diplodon (s.s.) expansus — Simpson (1900), Simpson (1914), Pereira et al. (2014)
Diplodon expansus — Ihering (1910), Bonetto (1959), Parodiz (1968), Mansur (1970), Quintana (1982), IUCN (1996), Simone (2006), Graf & Cummings (2007), Bogan (2010)
Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965), Figueiras (1965), Haas (1969), Rumi et al. (2008)
Diplodon multistriatus — Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)

Unio eurhynchus Küster, 1861
‘Bronn in lit.’ Küster, 1861. Conchyl. Cab. 9(2): 237, pl. 79, fig. 5.
Type(s): SYNTYPE BMNH_1965217, Minas Geraes, Brasilia.

Diplodon (s.s.) effulgens — Simpson (1900), Simpson (1914)
Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965), Haas (1969)
Diplodon expansus — Parodiz (1968), Mansur (1970), Quintana (1982), Simone (2006)

Unio guahybae Simpson, 1900
‘von Ihering’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 894. [nomen nudum]
‘von Ihering’ Simpson, 1914. Descr. Cat. Naiades: 1312. [nomen nudum]
Type(s): NOMEN NUDUM SMF_168335, Guahyba, Rio Grande do Sul, Brasil.

Diplodon guahybae — Simpson (1900), Simpson (1914)
Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965)
Diplodon expansus — Parodiz (1968), Mansur (1970), Simone (2006)

Diplodon (s.s.) mimus Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 1249.
Type(s): SYNTYPE USNM_162425, Iguape, Brazil.

Diplodon (s.s.) mimus — Simpson (1914), Morretes (1949)
Diplodon mimus — Marshall (1917)
Diplodon (s.s.) granosus multistriatus — Haas (1931), Bonetto (1964), Bonetto (1965), Haas (1969)
Diplodon expansus — Parodiz (1968), Mansur (1970), Quintana (1982), Simone (2006)

Unio bischoffi Simpson, 1914
‘von Ihering’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 894 [as ‘bishoffi’]. [nomen nudum]
‘von Ihering’ Simpson, 1914. Descr. Cat. Naiades: 1312. [nomen nudum]

Diplodon bischoffi — Simpson (1914)
Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965)
Diplodon expansus — Simone (2006)

Diplodon (s.s.) mogymirim Ortmann, 1921
Ortmann, 1921. Mem. Carnegie Mus. 8: 520, pl. 37, figs. 4-7; pl. 46, fig. 5; pl. 48, fig. 2; text fig. 4k.
Type(s): LECTOTYPE CM_61.9260 (by R.I. Johnson, 1977: 238), Creek near Mogy Mirim, Sao Paulo, Brazil, tributary to Rio Mogy Guassú and Rio Grande, upper Paraná drainage.

Diplodon (s.s.) mogymirim — Ortmann (1921), Morretes (1949)
Diplodon delodontus expansus — Haas (1930)
Diplodon mogymirim — Bonetto (1959)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965), Haas (1969)
Diplodon expansus — Parodiz (1968), Mansur (1970), Quintana (1982), Simone (2006)
— Miyahira et al. (2019)

Unio santi-pauli Haas, 1930
‘Ihering in litt.’ Haas, 1930. Senckenbergiana 12: 192.
(error for Unio sancta-paulae Simpson, 1914)

Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965)

Unio guatybae R.I. Johnson, 1971
‘“Ihering” Simpson’ R.I. Johnson, 1971. Bull. BMNH 20(3): 85.
(error for Unio guahybae Simpson, 1900)

Unio granulifer Paetel, 1890
‘Dkr.’ Paetel, 1890. Cat. Conch.-Samml. 3: 154.
(error for Unio granuliferus Dunker, 1849)

Diplodon (s.s.) granuliferus — Simpson (1900), Simpson (1914)

Unio psammactinus Ihering, 1893
Ihering, 1893. Arch. Naturg. 59(1): 107.
(misidentified reference to Unio psammactinus Philippi, 1848)

Diplodon expansus — Ihering (1910)

Unio bishoffi Simpson, 1900
‘von Ihering’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 894. [nomen nudum]

Diplodon bishoffi — Simpson (1900)
— Parodiz (1968)

Unio sancta-paulae Simpson, 1914
‘von Ihering’ Simpson, 1914. Descr. Cat. Naiades: 1312. [nomen nudum]

Diplodon sancta-paulae — Simpson (1914)

Unio sancti-pauli Bonetto, 1964
‘Ihering’ Bonetto, 1964. Physis 24(68): 325.
‘Ihering’ Bonetto, 1965. Anais Congr. Lat.-Amer. Zool. 2: 44.
(error for Unio santi-pauli Haas, 1930)

Diplodon expansus — Simone (2006)