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.

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), Bogan (2010), Massemin et al. (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.

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.

Diplodon (s.s.) granosus — Simpson (1900), Simpson (1914)
Hyridella lessoni — Haas (1930)
— Haas (1969)
Diplodon granosus — Simone (2006)

Unio psammaticus Lea, 1852
‘Bronn’ Lea, 1852. Synopsis Fam. Naiades: 21.
‘Philippi’ Parodiz, 1968. Sterkiana 30: 9.

Unio niloticus Sowerby, 1868
‘Caillaud’ [sic] Sowerby, 1868. Conch. Icon. 16: pl. 73, sp. 374.

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.

Diplodon (s.s.) granosus — Ortmann (1921)

Unio nuloticus Simone, 2006
‘Sowerby’ Simone, 2006. Land. Freshw. Moll. Brazil.: 259.