Unio (Leptodea) leptodon Rafinesque, 1820
Rafinesque, 1818. Amer. Mon. Mag. 3: 355 [as ‘Potamilus leptodon’]. [nomen nudum]
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 426 [as ‘U. (Plagiola) leptodon’]. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 295, pl. 80, figs. 5-7 [also as ‘Elliptio leptodon’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 29, 40.
Type(s): NEOTYPE ANSP_20214, Kentucky River.

Lampsilis (Proptera) leptodon — Simpson (1900), Simpson (1914)
Lampsilis leptodon — Vanatta (1915)
Lasmonos leptodon — Utterback (1916)
Paraptera leptodon — Ortmann (1918)
Leptodea leptodon — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), Haas (1969), ... Wu et al. (2020), Chen et al. (2020), Teiga-Teixeira et al. (2020), Graf & Cummings (2021), Wu et al. (2021)
Lampsilis (Leptodea) leptodon — Frierson (1927)
Potamilus leptodon — Smith et al. (2020), Smith & Johnson (2020), Zieritz et al. (2021), FMCS (2021), Wu et al. (2022), ... Hopper et al. (2023), Wu et al. (2023), Wu et al. (2024), Dai et al. (2024), Dai et al. (2025)

Unio (Leptodea) leptodon var. olivacea Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 295.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 41.
(intro'd as intra-sp. of Unio (Leptodea) leptodon Rafinesque, 1820)

— Vanatta (1915)

Unio (Leptodea) leptodon var. semiradiata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 295 [as ‘semi-radiata’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 41.
(intro'd as intra-sp. of Unio (Leptodea) leptodon Rafinesque, 1820)

— Vanatta (1915)

Anodon purpurascens Swainson, 1823
Swainson, 1823. Zool. Illustr. 3(1): pl. 160 [260?].
Swainson, 1840. Treat. Malacol.: 287; 381 [as ‘Hemiodon purpurscens’].

Lampsilis (Proptera) leptodon — Simpson (1900), Simpson (1914)
Leptodea leptodon — Ortmann & Walker (1922), Haas (1969), Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Lampsilis (Leptodea) leptodon — Frierson (1927)

Symphynota tenuissima Lea, 1829
Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 453, pl. 11, fig. 21.
Type(s): PARATYPE USNM_86052, Cincinnati, Ohio.

Lampsilis (Proptera) leptodon — Simpson (1900), Simpson (1914)
Unio (s.s.) tenuissimus — Call (1900)
Unio (Symphynota) tenuissima — de Gregorio (1914)
Lasmonos leptodon — Utterback (1916)
Leptodea leptodon — Ortmann & Walker (1922), Ortmann (1924), F.C. Baker (1928), Haas (1969), Burch (1975), Oesch (1984), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Lampsilis (Leptodea) leptodon — Frierson (1927)

Unio velum Say, 1829
Say, 1829. New Harm. Dissem. 2(19): 293.
Say, 1858. [in] Binney, Compl. Writings T. Say: 132.

Lampsilis (Proptera) leptodon — Simpson (1900), Simpson (1914)
Leptodea leptodon — Ortmann & Walker (1922), F.C. Baker (1928), Burch (1975), Oesch (1984), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Lampsilis (Leptodea) velum — Frierson (1927)
Leptodea velum — Haas (1969)

Lampsilis blatchleyi Daniels, 1902
Daniels, 1902. Nautilus 16(2): 13, pl. 2.
Type(s): HOLOTYPE UMMZ_82960, Wabash River, Grand Chain, Posey Co., Indiana.

Lampsilis (Proptera) blatchleyi — Simpson (1914)
Lampsilis (Leptodea) velum — Frierson (1927)
Leptodea velum — Haas (1969)
Leptodea leptodon — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Anodon purpurescens Ferussac, 1835
‘Swainson’ Ferussac, 1835. Mag. Zool. 5: 25.
(error for Anodon purpurascens Swainson, 1823)

Unio leptodon Conrad, 1836
‘Rafinesque’ Conrad, 1836. Monogr. Fam. Unionidae 1(7): 58, pl. 33.
(reference to Unio (Leptodea) leptodon Rafinesque, 1820)

Lampsilis (Proptera) leptodon — Simpson (1900)
Leptodea leptodon — Watters et al. (2009)

Unio planus Conrad, 1836
Conrad, 1836. Monogr. Fam. Unionidae 1(7): 59.
(misidentified reference to Unio planus Barnes, 1823)