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.

Unio multistriatus — Lea (1831), Hanley (1843), Sowerby (1868), Ihering (1890)
Unio (s.s.) multistriata — d’Orbigny (1835)
Margarita (Unio) multistriatus — Lea (1836), Lea (1838)
Diplodon multistriatus — Sowerby (1839), Ihering (1910), Bonetto (1959), Simone (2006), Graf & Cummings (2007), Bogan (2010), Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)
Unio multistriata — d’Orbigny (1846), Hupé (1857)
Margaron (Unio) ellipticus — Lea (1852), Lea (1870)
Unio (Niæa) multistriatus — Mörch (1853)
Unio ellipticus — Küster (1861)
Unio (Limnium sec. Niaea) multistriatus — Fischer (1887)
Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921)
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 expansus Küster, 1856
‘Charpentier mss.’ Küster, 1856, Conchyl. Cab. 9(2): 149, pl. 43, fig. 5.

Unio expansus — Küster (1856)
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), Figueiras (1965), Bonetto (1965), Haas (1969), Rumi et al. (2008)
Diplodon multistriatus — Miyahira et al. (2019), Mansur et al. (2020), Graf & Cummings (2021)

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

Unio coriaceus — Dunker (1849)
Unio coriacea — Hupé (1857)
Unio multistriatus — Ihering (1890)
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, Z. Malak. 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.

Unio granuliferus — Dunker (1849)
Unio granulifera — Hupé (1857)
Unio multistriatus — Ihering (1890)
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.

Unio effulgens — Lea (1856)
Margaron (Unio) effulgens — Lea (1870)
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 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.

Unio eurhynchus — Küster (1861)
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 granulifer Paetel, 1890
‘Dkr.’ Paetel, 1890, Cat. Conch.-Samml. 3: 154.
(error for Unio granuliferus Dunker, 1849)

Unio granulifer — Paetel (1890)
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)

Unio psammactinus — Ihering (1893)
Diplodon expansus — Ihering (1910)

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

Unio bishoffi — Simpson (1900)
Diplodon bishoffi — Simpson (1900)

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.

Unio guahybae — Simpson (1900)
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]

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

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

Unio sancta-paulae — Simpson (1914)
Diplodon sancta-paulae — Simpson (1914)

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, 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)

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

Unio santi-pauli — Haas (1930)
Diplodon delodontus expansus — Haas (1930)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Bonetto (1965)

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)

Unio sancti-pauli — Bonetto (1964)
Diplodon expansus — Simone (2006)

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

Unio guatybae — R.I. Johnson (1971)

Taxonomic History (since 1900)

Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921)
Diplodon (s.s.) coriaceus — Simpson (1900), Simpson (1914)
Diplodon (s.s.) granuliferus — Simpson (1900), Simpson (1914)
Diplodon (s.s.) effulgens — Simpson (1900), Simpson (1914)
Diplodon (s.s.) expansus — Simpson (1900), Simpson (1914), Pereira et al. (2014)
Unio bishoffi — Simpson (1900)
Diplodon bishoffi — Simpson (1900)
Unio guahybae — Simpson (1900)
Diplodon guahybae — Simpson (1900), Simpson (1914)
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 expansus — Ihering (1910), Bonetto (1959), Parodiz (1968), Mansur (1970), Quintana (1982), IUCN (1996), Simone (2006), Graf & Cummings (2007), Bogan (2010)
Diplodon (s.s.) mimus — Simpson (1914), Morretes (1949)
Unio bischoffi — Simpson (1914)
Diplodon bischoffi — Simpson (1914)
Unio sancta-paulae — Simpson (1914)
Diplodon sancta-paulae — Simpson (1914)
Diplodon mimus — Marshall (1917)
Diplodon (s.s.) mogymirim — Ortmann (1921), Morretes (1949)
Diplodon delodontus expansus — Haas (1930)
Unio santi-pauli — Haas (1930)
Diplodon (s.s.) granosus multistriatus — Haas (1931), Bonetto (1964), Bonetto (1965), Haas (1969), Mansur & Pereira (2006), Rumi et al. (2008)
Diplodon (s.s.) granosus granosus — Haas (1931), Haas (1969)
Diplodon mogymirim — Bonetto (1959)
Diplodon (s.s.) delodontus expansus — Bonetto (1964), Figueiras (1965), Bonetto (1965), Haas (1969), Rumi et al. (2008)
Unio sancti-pauli — Bonetto (1964)
Diplodon ellipticus — Parodiz (1968), Mansur (1970)
Diplodon granosus — Parodiz (1968), Simone (2006)
Unio guatybae — R.I. Johnson (1971)
Diplodon granosus multistriatus — IUCN (2011)
Diplodon (s.s.) multistriatus — Pereira et al. (2014)