Leptodea Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 295.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 40.
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Unio (Leptodea) fragilis Rafinesque, 1820 (sub. desig. by Herrmannsen, 1847: 584) = Leptodea fragilis

Lasmonos Rafinesque, 1831
Rafinesque, 1831, Continuation: 5.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 81.
(renamed Monelasmus Agassiz, 1846)
Type species: Lasmonos fragilis Rafinesque, 1831 (orig. desig.) = Leptodea fragilis

Monelasmus Agassiz, 1846
Agassiz, 1846, Nomencl. Zool. Index Univ.: 237.
(new name for Lasmonos Rafinesque, 1831)

Monelagmus Paetel, 1875
‘Agas.’ Paetel, 1875, Fam. Gatt. Moll.: 127.
(error for Monelasmus Agassiz, 1846)

Paraptera Ortmann, 1911
Ortmann, 1911, Mem. Carnegie Mus. 4: 301.
Ortmann, 1912, Ann. Carnegie Mus. 8: 330.
Type species: Unio gracilis Barnes, 1823 (orig. desig.) = Leptodea fragilis

Pareptera Frierson, 1914
‘Ortmann’ Frierson, 1914, Nautilus 28: 7.
(error for Paraptera Ortmann, 1911)

Taxonomic History (since 1900)

Lampsilis (Proptera) — Simpson (1900), Ortmann (1909), Simpson (1914)
— Simpson (1900), de Gregorio (1914), Simpson (1914), Vanatta (1915), Frierson (1927), Burch (1975)
Unio (s.s.) — Call (1900)
Proptera — Ortmann (1909), Ortmann (1910), Frierson (1927), Haas (1969)
Paraptera — Ortmann (1912), Ortmann (1918)
Unio (Symphynota) — de Gregorio (1914)
Lampsilis — Vanatta (1915)
Lasmonos — Utterback (1916), Utterback (1916)
Leptodea — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), ..., Chen et al. (2020), Teiga-Teixeira et al. (2020), Klymus et al. (2020), Graf & Cummings (2021)
Lampsilis (Leptodea) — Frierson (1927)
Unio — Henderson (1935)
Medionidus — Haas (1969), Burch (1975), R.I. Johnson (1977), Turgeon et al. (1988), ..., IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Potamilus — Smith et al. (2020)