Obovaria stegaria Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 312, pl. 82, figs. 4-5 [also as ‘Unio stegaria’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 55.

Obovaria stegaria — Simpson (1900), Simpson (1914)
Cyprogenia stegaria — Vanatta (1915), Ortmann (1918), Frierson (1927), Haas (1930), Thiele (1934), ... Klymus et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)
Cyprogenia irroratus — Ortmann & Walker (1922)
Cyprogenia irrorata — Burch (1975)

Obovaria stegaria var. fasciolata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 312.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 55.
(intro'd as intra-sp. of Obovaria stegaria Rafinesque, 1820)

— Vanatta (1915)

Obovaria stegaria var. tuberculata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 312.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 55.
(intro'd as intra-sp. of Obovaria stegaria Rafinesque, 1820; homonym of Obovaria striata var. tuberculata Rafinesque, 1820)
Type(s): LECTOTYPE ANSP_20241, Ohio River.

Cyprogenia stegaria — Vanatta (1915), Williams et al. (2008), Watters et al. (2009)

Unio irroratus Lea, 1828
Lea, 1828. Trans. Amer. Phil. Soc. 3 [O. 1]: 269, pl. 5, fig. 5-7.
Type(s): PARATYPE USNM_84299, Cincinnati, Ohio.

Cyprogenia irrorata — Simpson (1900), Ortmann (1909), Ortmann (1909), Ortmann (1912), Simpson (1914), Ortmann (1924), Ortmann (1925), Burch (1975)
Unio (s.s.) irroratus — Call (1900)
Cryptogenia [sic] irrorata — Ortmann (1909)
Unio irroratus — de Gregorio (1914)
Cyprogenia stegaria — Vanatta (1915), Ortmann (1918), Frierson (1927), Haas (1930), Thiele (1934), ... Parmalee & Bogan (1998), Graf & Cummings (2007), Williams et al. (2008), Watters et al. (2009), Graf & Cummings (2021)
Cyprogenia irroratus — Ortmann & Walker (1922)
Cyprogenia irrorata irrorata — ITIS (2012)

Unio verrucosus albus Hildreth, 1828
Hildreth, 1828. Amer. J. Sci. 14: 281.
(intro'd as intra-sp. of Unio verrucosus Barnes, 1823)

Cyprogenia irrorata — Simpson (1900), Simpson (1914)
Cyprogenia stegaria — Frierson (1927), Haas (1969), R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008)

Unio stegarius Say, 1834
‘Rafinesque’ of Authors.
Say, 1834. Amer. Conch. 6: ??.
Ferussac, 1835. Mag. Zool. 5: 28.
Conrad, 1838. Monogr. Fam. Unionidae 1(10): 83, pl. 46, fig. 1.
Reeve, 1864. Conch. Icon. 16: pl. 12, sp. 45.
(reference to Obovaria stegaria Rafinesque, 1820)

Cyprogenia irrorata — Simpson (1900), Simpson (1914)
Cyprogenia stegaria — R.I. Johnson (1980), Watters et al. (2009)

Cyprogenia irrorata var. pusilla Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 610.
Simpson, 1914. Descr. Cat. Naiades: 328.
(intro'd as intra-sp. of Unio irroratus Lea, 1828)
Type(s): LECTOTYPE USNM_152004 (by R.I. Johnson, 1975: 18), Mammoth Cave (Green R.), Kentucky.

Cyprogenia irrorata var. pusilla — Simpson (1900), Simpson (1914)
Cyprogenia stegaria-pusilla — Frierson (1927)
Cyprogenia stegaria — Haas (1969), R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Cyprogenia irrorata pusilla — ITIS (2012)