Unio granosa Bruguière, 1792
Bruguière, 1792, J. de Hist. Nat. 1: 107, pl. 6, figs. 3-4.
Bruguière, 1797, Encycl. Méth. 2: pl. 249, figs. 2a-b [as Unio sp.].
Type(s): HOLOTYPE MNHN-IM-2000-1710, Cayenne.

Unio granosa — Bruguière (1792), Lamarck (1819), Bory de St. Vincent (1827), Lea (1829), Deshayes (1832), Lea (1834), Hupé (1857)
Margarita (Unio) granosus — Lea (1836), Lea (1838)
Iridea granosa — Swainson (1840)
Unio granosus — Hanley (1843)
Margaron (Unio) granosus — Lea (1852), Lea (1870)
Unio (Iridea) granosus — Conrad (1853), Adams & Adams (1857)
Unio (Limnium sec. Iridea) granosus — Fischer (1887)
Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921), Morretes (1949), Bonetto (1965), Martinez et al. (2004), Rumi et al. (2008)
Diplodon (s.s.) granosus granosus — Haas (1931), Bonetto (1964), Haas (1969)
Diplodon granosus — Parodiz (1968), Simone (2006), Graf & Cummings (2007), Lasso et al. (2009), Massemin et al. (2010), Bogan (2010), IUCN (2011), Mansur et al. (2020), Graf & Cummings (2021)
Diplodon (s.s.) granosa — Pereira et al. (2014)

Unio psammactinus Philippi, 1848
‘Bronn’ Philippi, 1848, Abbild. Beschr. Conch. 3: 79, pl. 5, fig. 2.

Unio psammactinus — Philippi (1848), Küster (1856)
Margaron (Unio) ellipticus — Lea (1852), Lea (1870)
Unio (Niæa) multistriatus — Mörch (1853)
Unio psammactina — Hupé (1857)
Unio ellipticus — Sowerby (1868)
Unio multistriatus — Ihering (1890)
Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921)
Diplodon (s.s.) granosus granosus — Haas (1931), Haas (1969)
Diplodon granosus — Parodiz (1968), Simone (2006)
Diplodon multistriatus — Miyahira et al. (2019)

Unio famelicus Gould, 1850
Gould, 1850, Proc. Boston Soc. Nat. Hist. 3: 294.
Gould, 1852, U.S. Explor. Exped. 12: 432, figs. 544-544b.
Type(s): HOLOTYPE USNM_5929, Oregon.

Unio famelicus — Gould (1850), Conrad (1853), Sowerby (1868), B.H. Wright (1888)
Margaron (Unio) famelicus — Lea (1852), Lea (1870)
Unio (Niäa) famelicus — Adams & Adams (1857)
Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914)
Hyridella lessoni — Haas (1930)
Diplodon granosus — Simone (2006)

Unio psammaticus Lea, 1852
‘Bronn’ Lea, 1852, Synopsis Fam. Naiades: 21.
‘Philippi’ Parodiz, 1968, Sterkiana 30: 9.
(error for Unio psammactinus Philippi, 1848)

Unio psammaticus — Lea (1852)

Unio niloticus Sowerby, 1868
‘Caillaud’ [sic] Sowerby, 1868, Conch. Icon. 16: pl. 73, sp. 374.
(misidentified reference to Unio niloticus Cailliaud, 1827)

Unio niloticus — Sowerby (1868), E.A. Smith (1880)
Unio aegyptiacus — Jickeli (1874), Kobelt (1886)
Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914)
Diplodon granosus — Simone (2006)

Diplodon expansus Ihering, 1910
‘Küster’ Ihering, 1910, Abh. Senckenb. Naturf. Ges. 32: 134.
(misidentified reference to Unio expansus Küster, 1856)

Diplodon expansus — Ihering (1910)
Diplodon (s.s.) granosus — Ortmann (1921)

Unio nuloticus Simone, 2006
‘Sowerby’ Simone, 2006, Land. Freshw. Moll. Brazil.: 259.
(error for Unio niloticus Sowerby, 1868)

Unio nuloticus — Simone (2006)

Taxonomic History (since 1900)

Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914), Ortmann (1921), Morretes (1949), Bonetto (1965), Martinez et al. (2004), Rumi et al. (2008)
Diplodon expansus — Ihering (1910)
Hyridella lessoni — Haas (1930)
Diplodon (s.s.) granosus granosus — Haas (1931), Bonetto (1964), Haas (1969)
Diplodon granosus — Parodiz (1968), Simone (2006), Graf & Cummings (2007), Lasso et al. (2009), Massemin et al. (2010), Bogan (2010), IUCN (2011), Mansur et al. (2020), Graf & Cummings (2021)
Unio nuloticus — Simone (2006)
Diplodon (s.s.) granosa — Pereira et al. (2014)
Diplodon multistriatus — Miyahira et al. (2019)