Unio iris Lea, 1829
Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 439, pl. 11, fig. 18.
Type(s): SYNTYPES USNM_86035, Cincinnati, Ohio.

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Unio (s.s.) iris — Call (1900)
Lampsilis iris — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910)
Eurynia (Micromya) iris — Ortmann (1912), Utterback (1916)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Unio iris — de Gregorio (1914)
Micromya iris — Ortmann (1924), Ortmann (1925)
Lampsilis (Ligumia) nervosa — Frierson (1927)
Ligumia nervosa — Haas (1969)
Villosa iris — Burch (1975), Gordon et al. (1979), Mathiak (1979), R.I. Johnson (1980), Mackie et al. (1980), ... Bolotov et al. (2020), Inoue et al. (2020), Klymus et al. (2020), Gasparini et al. (2020), Jeratthitikul et al. (2022)
Cambarunio iris — Watters (2018), Pfeiffer et al. (2019), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025), Campbell & Lydeard (2026)

Unio creperus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 28. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 33, pl. 10, fig. 28.
Type(s): HOLOTYPE (MONOTYPY) USNM_85264, Tennessee.

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) nervosa — Frierson (1927)
Ligumia nervosa — Haas (1969)
Villosa iris — Oesch (1984), Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio glaber Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 29. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 34, pl. 10, fig. 29.
Type(s): HOLOTYPE USNM_85266, Holston R., Tenn.

Lampsilis (sec. Eurynia) nebulosus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) nebulosa — Simpson (1914)
Unio glaber, aff. — de Gregorio (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) nebulosa — Frierson (1927)
Ligumia nebulosa — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio novieboraci Lea, 1838
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 104, pl. 24, fig. 114 [as ‘novi-eboraci’].
Type(s): LECTOTYPE USNM_86042 (by R.I. Johnson, 1974: 100), Oak Orchard Cr., N.Y.

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Micromya iris — Ortmann (1925)
Lampsilis (Ligumia) nervosa — Frierson (1927)
Ligumia (Micromya) iris novieboraci — F.C. Baker (1928)
Ligumia nervosa — Haas (1969)
Villosa iris — Oesch (1984), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Cambarunio iris — Watters (2018)

Unio obscurus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 26. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 7, pl. 3, fig. 7.
Type(s): HOLOTYPE USNM_85128, Tennessee.

Lampsilis (sec. Eurynia) obscurus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis subrostrata) obscura — Simpson (1914)
Unio obscurus — de Gregorio (1914)
Eurynia nebulosus — Ortmann (1918)
Micromya nebulosa — Ortmann (1924)
Lampsilis (Ligumia) vanuxemensis — Frierson (1927)
Ligumia vanuxemensis — Haas (1969)
Villosa nebulosa — Burch (1975)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Leaunio vanuxemensis — Watters (2018)

Unio zeiglerianus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 26. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 32, pl. 10, fig. 27.
Type(s): HOLOTYPE USNM_85130, Cumberland R., Tenn.

Lampsilis (sec. Eurynia) obscurus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis subrostrata) obscura — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) zeigleriana — Frierson (1927)
Ligumia zeigleriana — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Leaunio vanuxemensis — Watters (2018)

Unio amoenus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 286 [as ‘amœnus’].
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 200, pl. 10, fig. 12 [as ‘amœnus’].
Type(s): HOLOTYPE USNM_85070, Holston R., Tenn.

Lampsilis (sec. Eurynia) amœnus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) amœna — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) nervosa — Frierson (1927)
Ligumia nervosa — Haas (1969)
Villosa nebulosa — Burch (1975)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio fatuus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 287.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 201, pl. 11, fig. 14.
Type(s): HOLOTYPE USNM_86047, Holston R., Tenn.

Lampsilis (sec. Eurynia) fatuus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) fatua — Simpson (1914)
Unio fatuus, var. — de Gregorio (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) nervosa — Frierson (1927)
Ligumia nervosa — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio tener Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 286.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 198, pl. 10, fig. 10.
Type(s): HOLOTYPE USNM_85026, Big Pigeon R., Tenn.

Lampsilis (sec. Eurynia) tener — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) tenera — Simpson (1914)
— de Gregorio (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) tenera — Frierson (1927)
Ligumia tenera — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio regularis Lea, 1841
Lea, 1841. Proc. Amer. Phil. Soc. 2: 82.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 243, pl. 25, fig. 59.
Type(s): HOLOTYPE USNM_85067, French Broad River, E Tenn.

Lampsilis (sec. Eurynia) tener — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) tenera — Simpson (1914)
— de Gregorio (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) tenera — Frierson (1927)
Ligumia tenera — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio puniceus Haldeman, 1842
Haldeman, 1842. Jour. Acad. Nat. Sci. 8: 201.

Lampsilis (sec. Eurynia) puniceus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis subrostrata) punicea — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) vanuxemensis — Frierson (1927)
Ligumia vanuxemensis — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio zieglerianus Hanley, 1843
‘Lea’ of Authors.
Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 193.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 260.
Lea, 1870. Synopsis Fam. Naiades: 45.
(error for Unio zeiglerianus Lea, 1838)

Unio perpictus Lea, 1860
Lea, 1860. Proc. Acad. Nat. Sci. 12: 306.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 350, pl. 58, fig. 175.
Type(s): HOLOTYPE USNM_85034, Bull R., Tenn.

Lampsilis (sec. Eurynia) nebulosus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) nebulosa — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) nebulosa — Frierson (1927)
Ligumia nebulosa — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio scitulus Lea, 1860
Lea, 1860. Proc. Acad. Nat. Sci. 12: 93.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 42, pl. 55, fig. 167.
Type(s): HOLOTYPE USNM_85084, Tuscumbia, Alabama.

Lampsilis (sec. Eurynia) nebulosus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) nebulosa — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Micromya nebulosa — Ortmann (1925)
Lampsilis (Ligumia) nebulosa — Frierson (1927)
Ligumia nebulosa — Haas (1969)
Villosa nebulosa — Burch (1975)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Cambarunio iris — Watters (2018)

Unio cressurus Binney, 1864
Binney, 1864. Smithsonian Misc. Coll. (174): 57.
(error for Unio cresserus Hanley, 1843)

Ligumia nervosa — Haas (1969)

Unio subrostratus Reeve, 1864
‘Say’ Reeve, 1864. Conch. Icon. 16: pl. 17, sp. 78; errata [changed to ‘U. patulus Lea’].
(misidentified reference to Unio subrostratus Say, 1831; error for Unio patulus Lea, 1829)

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Lampsilis (Ligumia) nervosa — Frierson (1927)
— Haas (1969)

Unio opalinus J.G. Anthony, 1866
J.G. Anthony, 1866. Amer. J. Conch. 2(2): 146, pl. 7, fig. 2.
Type(s): HOLOTYPE MCZ_161893, Michigan.

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Lampsilis (Ligumia) fasciata-opalina — Frierson (1927)
Ligumia siliquoidea siliquoidea — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Cambarunio iris — Watters (2018)

Unio dispansus Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 191.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 19 [23], pl. 6, fig. 16.
Type(s): FIGURED SYNTYPE USNM_85094, E Tennessee.

Lampsilis (sec. Eurynia) vanuxemensis — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis subrostrata) vanuxemensis — Simpson (1914)
Eurynia nebulosus — Ortmann (1918)
Lampsilis (Ligumia) vanuxemensis — Frierson (1927)
Ligumia vanuxemensis — Haas (1969)
Villosa iris — Parmalee & Bogan (1998), Williams et al. (2008)
Leaunio vanuxemensis — Watters (2018)

Lampsilis (Ligumia) nervosa Frierson, 1927
‘Rafinesque’ of Authors.
Frierson, 1927. Check List N. Amer. Naiades: 77, sp. 336.
Haas, 1969. Das Tierreich 88: 445.
(misidentified reference to Unio (Leptodea) nervosa Rafinesque, 1820)

Villosa iris — Parmalee & Bogan (1998), Watters et al. (2009)
Cambarunio iris — Watters (2018)

Unio cresserus Hanley, 1843
‘Lea’ Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 196.
(error for Unio creperus Lea, 1838)

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Ligumia nervosa — Haas (1969)
Villosa iris — Parmalee & Bogan (1998)

Unio radiatus De Kay, 1843
‘Gmelin’ De Kay, 1843. Zool. New York 5: 189, pl. 18. fig. 236.
(misidentified reference to Mya radiata Gmelin, 1791)

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Villosa iris — Oesch (1984), Parmalee & Bogan (1998)

Unio amaenus Lea, 1852
Lea, 1852. Synopsis Fam. Naiades: 29 [as ‘amænus’].
‘Lea’ Hanley, 1856. Illustr. Descr. Cat. Rec. Bivalve Shells: 386 [as ‘amænus’].
(error for Unio amoenus Lea, 1840)

Unio subrostratus Küster, 1861
‘Say’ Küster, 1861. Conchyl. Cab. 9(2): 203, pl. 67, fig. 3.
(misidentified reference to Unio subrostratus Say, 1831)

Lampsilis (sec. Eurynia) iris — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) iris — Simpson (1914)
Lampsilis (Ligumia) nebulosa — Frierson (1927)
Villosa iris — Parmalee & Bogan (1998), Watters et al. (2009)

Unio subrostratus Küster, 1861
‘Say’ Küster, 1861. Conchyl. Cab. 9(2): 203, pl. 68, fig. 1.
(misidentified reference to Unio subrostratus Say, 1831)

Lampsilis (sec. Eurynia) subrostratus — Simpson (1900)
Lampsilis (Eurynia) (Group of Lampsilis iris) nebulosa — Simpson (1914)