Unio (Leptodea) fragilis Rafinesque, 1820
Rafinesque, 1818, Amer. Mon. Mag. 3: 355 [‘Potamilus fragilis’]. [nomen nudum]
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 295 [also as ‘Elliptio fragilis’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 22, 41.
Type(s): LECTOTYPE ANSP_20209, creeks, Kentucky.

Unio (Leptodea) fragilis — Rafinesque (1820)
Potamilus fragilis — Rafinesque (1818), Smith et al. (2020), Johnson & Smith (2020), Smith & Johnson (2020), FMCS (2021)
Unio fragilis — Deshayes (1830), Conrad (1836), Küster (1848)
Symphynota fragilis — Ferussac (1835)
Unio gracilis — Hanley (1843)
Metaptera fragilis — Agassiz (1852), Conrad (1853)
Lampsilis fragilis — Vanatta (1915)
Lasmonos fragilis — Utterback (1916)
Paraptera fragilis — Ortmann (1918)
Leptodea fragilis — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), ..., Smith et al. (2019), Klymus et al. (2020), Inoue et al. (2020), Graf & Cummings (2021)
Lampsilis (Leptodea) fragilis — Frierson (1927)

Medionidus mcglameriae van der Schalie, 1939
van der Schalie, 1939, Occ. Pap. Mus. Zool. Univ. Mich. (407): 1, pl. 1, figs. 1-3.
Type(s): HOLOTYPE UMMZ_130460, Tombigbee River, Epes, Sumpter Co., Alabama.

Medionidus mcglameriae — van der Schalie (1939), Haas (1969), Burch (1975), R.I. Johnson (1977), ..., IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Medionidus macglameriae — Turgeon et al. (1988), Williams et al. (1993)
Leptodea fragilis — Williams et al. (2008), Bogan (2010), Williams et al. (2017), Graf & Cummings (2021)

Lasmonos fragilis Rafinesque, 1831
Rafinesque, 1831, Continuation: 5.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 81.
(homonym of Unio (Leptodea) fragilis Rafinesque, 1820)

Lasmonos fragilis — Rafinesque (1831), Utterback (1916)
Dipsas fragilis — Ferussac (1835)
Leptodea leptodon — Ortmann & Walker (1922), Haas (1969), Oesch (1984)
Leptodea fragilis — Davis & Fuller (1981), Lydeard et al. (1996), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio gracilis Barnes, 1823
Barnes, 1823, Amer. J. Sci. 6 (1-2): 274 [‘174’].

Unio gracilis — Barnes (1823), Hildreth (1828), Hanley (1843), Lapham (1860), Sowerby (1866), Lewis (1871), B.H. Wright (1888), Singley (1893), Call (1895), Pilsbry & Rhoads (1896)
Symphynota gracilis — Lea (1829), Jay (1835)
Symphynota fragilis — Ferussac (1835)
Unio fragilis — Conrad (1836), Küster (1848)
Margarita (Unio) gracilis — Lea (1836), Lea (1838)
Metaptera gracilis — Stimpson (1851), Agassiz (1852)
Margaron (Unio) gracilis — Lea (1852), Lea (1870)
Metaptera fragilis — Conrad (1853)
Unio (Metaptera) gracilis — Adams & Adams (1857)
Lampsilis (Proptera) gracilis — Simpson (1900), Ortmann (1909), Simpson (1914)
Unio (s.s.) gracilis — Call (1900)
Proptera gracilis — Ortmann (1909), Ortmann (1910), Haas (1969)
Paraptera gracilis — Ortmann (1912)
Lampsilis fragilis — Vanatta (1915)
Lasmonos fragilis — Utterback (1916)
Paraptera fragilis — Ortmann (1918)
Leptodea fragilis — Ortmann & Walker (1922), Ortmann (1924), F.C. Baker (1928), Murray & Leonard (1962), ..., Howells et al. (1996), Strayer & Jirka (1997), Williams et al. (2008), Watters et al. (2009)
Lampsilis (Leptodea) fragilis — Frierson (1927)

Unio (Leptodea) fragilis var. fuscata 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) fragilis Rafinesque, 1820; homonym of Unio (Elliptio) viridis var. fuscata Rafinesque, 1820)

Unio (Leptodea) fragilis var. fuscata — Rafinesque (1820)

Unio fragilis Swainson, 1823
‘Rafinesque’ of Authors.
Swainson, 1823, Zool. Illustr. 3(1): pl. 171.
Deshayes, 1830, Enc. Méth. 2: 587.
Conrad, 1836, Monogr. Fam. Unionidae 1(6): 55, pl. 30.
(reference to Unio (Leptodea) fragilis Rafinesque, 1820)

Unio fragilis — Swainson (1823), Conrad (1836), Küster (1848)
Symphynota gracilis — Lea (1829)
Symphynota fragilis — Ferussac (1835)
Margarita (Unio) atratus — Lea (1836)
Margarita (Unio) gracilis — Lea (1838)
Mysca (Lymnadia) fragilis — Swainson (1840)
Margaron (Unio) gracilis — Lea (1852), Lea (1870)
Metaptera fragilis — Conrad (1853)
Unio gracilis — Call (1895)
Lampsilis (Proptera) gracilis — Simpson (1900), Simpson (1914)
Lampsilis (Leptodea) fragilis — Frierson (1927)
Proptera gracilis — Haas (1969)

Unio planus Barnes, 1823
Barnes, 1823, Amer. J. Sci. 6 (1-2): 272, pl. 13, fig. 16.
(homonym of Unio planus Studer, 1820)

Unio planus — Barnes (1823)
Symphynota gracilis — Lea (1829)
Symphynota fragilis — Ferussac (1835)
Margarita (Unio) gracilis — Lea (1836), Lea (1838)
Unio leptodon — Conrad (1836), Küster (1861)
Unio gracilis — Hanley (1843)
Margaron (Unio) gracilis — Lea (1852), Lea (1870)
Leptodea leptodon — Conrad (1853)
Lampsilis (Leptodea) leptodon — Frierson (1927)
Lampsilis (Leptodea) velum — Frierson (1927)
Proptera laevissima — Frierson (1927)
Leptodea fragilis — F.C. Baker (1928), Williams et al. (2008), Watters et al. (2009)
Proptera gracilis — Haas (1969)

Unio (Niaa) atrata Swainson, 1823
Swainson, 1823, Zool. Illustr. 3(1): pl. 171.

Unio (Niaa) atrata — Swainson (1823)
Margarita (Unio) atratus — Lea (1836), Lea (1838)
Unio atratus — Sowerby (1839), Hanley (1856)
Unio atrata — Hanley (1843)
Margaron (Unio) atratus — Lea (1852), Lea (1870)
Unio (Niäa) atratus — Adams & Adams (1857)
Unio (sec. Naïa) atratus — Paetel (1890)
Lampsilis (Proptera) gracilis — Simpson (1900), Simpson (1914)
Lampsilis (Leptodea) fragilis — Frierson (1927)
Leptodea fragilis — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Mya plana Eaton, 1826
‘Barnes’ Eaton, 1826, Zool. Text-Book: 221.
(reference to Unio planus Barnes, 1823)

Mya plana — Eaton (1826)
Margaron (Unio) gracilis — Lea (1870)
Lampsilis (Proptera) gracilis — Simpson (1900), Simpson (1914)
Leptodea fragilis — Parmalee & Bogan (1998), Watters et al. (2009)

Margarita (Unio) atratus Lea, 1836
‘Swain.’ Lea, 1836, Synopsis Fam. Naiades: 31.
Lea, 1852, Synopsis Fam. Naiades: 33.
(reference to Unio (Niaa) atrata Swainson, 1823)

Margarita (Unio) atratus — Lea (1836)
Unio atrata — Hanley (1843)
Unio atratus — Hanley (1856)
Proptera gracilis — Haas (1969)

Unio leptodea var. planus Jay, 1850
‘Barnes’ Jay, 1850, Cat. Rec. Shells: 61.
(reference to Unio planus Barnes, 1823)

Unio leptodea var. planus — Jay (1850)
Leptodea fragilis — Parmalee & Bogan (1998), Watters et al. (2009)

Lampsilis simpsoni Ferriss, 1900
Ferriss, 1900, Nautilus 14: 38, text fig.

Lampsilis simpsoni — Ferriss (1900)
Lampsilis (Proptera) simpsoni — Simpson (1914)
Lasmonos simpsoni — Utterback (1916)
Lampsilis (Leptodea) fragilis-simpsoni — Frierson (1927)
Proptera gracilis — Haas (1969)
Leptodea fragilis — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Lampsilis gracilis lacustris F.C. Baker, 1922
F.C. Baker, 1922, Nautilus 35(4): 131.
F.C. Baker, 1928, Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 237, pl. 80, figs. 5-7; pl. 81, figs. 1-2.
(intro'd as intra-sp. of Unio gracilis Barnes, 1823)
Type(s): HOLOTYPE (ORIG. DESIG.) UMMZ_209186, L. Butte de Morts, Wisc.

Lampsilis gracilis lacustris — F.C. Baker (1922)
Leptodea fragilis lacustris — F.C. Baker (1928)
Leptodea fragilis — R.I. Johnson (1980), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Medionidus macglameriae Turgeon et al., 1988
‘van der Schalie’ of Authors.
Turgeon et al., 1988, Am. Fisher. Soc. Spec. Publ. (16): 31.
Williams et al., 1993, Fisheries 18(9): 13.
(error for Medionidus mcglameriae van der Schalie, 1939)

Medionidus macglameriae — Turgeon et al. (1988)
Medionidus mcglameriae — Turgeon et al. (1998)

Unio plantus Williams et al., 2008
‘Barnes’ Williams et al., 2008, Freshw. Mussels AL and Mobile Basin: 419.
(error for Unio planus Barnes, 1823)

Unio plantus — Williams et al. (2008)

Taxonomic History (since 1900)

Lampsilis (Proptera) gracilis — Simpson (1900), Ortmann (1909), Simpson (1914)
Unio (s.s.) gracilis — Call (1900)
Lampsilis simpsoni — Ferriss (1900)
Proptera gracilis — Ortmann (1909), Ortmann (1910), Haas (1969)
Paraptera gracilis — Ortmann (1912)
Lampsilis (Proptera) simpsoni — Simpson (1914)
Lampsilis fragilis — Vanatta (1915)
Lasmonos fragilis — Utterback (1916)
Lasmonos simpsoni — Utterback (1916)
Paraptera fragilis — Ortmann (1918)
Leptodea fragilis — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), ..., Smith et al. (2019), Klymus et al. (2020), Inoue et al. (2020), Graf & Cummings (2021)
Leptodea leptodon — Ortmann & Walker (1922), Haas (1969), Oesch (1984)
Lampsilis gracilis lacustris — F.C. Baker (1922)
Lampsilis (Leptodea) fragilis — Frierson (1927)
Lampsilis (Leptodea) leptodon — Frierson (1927)
Lampsilis (Leptodea) velum — Frierson (1927)
Proptera laevissima — Frierson (1927)
Lampsilis (Leptodea) fragilis-simpsoni — Frierson (1927)
Leptodea fragilis lacustris — F.C. Baker (1928)
Medionidus mcglameriae — van der Schalie (1939), Haas (1969), Burch (1975), R.I. Johnson (1977), ..., IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Medionidus macglameriae — Turgeon et al. (1988), Williams et al. (1993)
Unio plantus — Williams et al. (2008)
Potamilus fragilis — Smith et al. (2020), Johnson & Smith (2020), Smith & Johnson (2020), FMCS (2021)