Unio atromarginatus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 288 [as ‘atro-marginatus’].
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 207 [45], pl. 13, fig. 21 [as ‘atro-marginatus’].

Unio (sec. Elliptio) sloatianus — Simpson (1900), Simpson (1914)
— de Gregorio (1914)
Elliptio (Elliptoideus) sloatianus — Frierson (1927), Haas (1969)
Elliptio sloatianus — Clench & Turner (1956)
Elliptoideus sloatianus — Burch (1975), Brim Box & Williams (2000), Williams et al. (2008), Williams et al. (2011), Williams et al. (2014)
Plectomerus dombeyana — Oesch (1984)
Plectomerus dombeyanus — Howells et al. (1996)

Unio sloatianus Lea, 1840
Lea, 1840. Proc. Amer. Phil. Soc. 1: 287.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 217 [55], pl. 16, fig. 33.
Type(s): LECTOTYPE AMNH_56104, Chattahoochee River, Georgia.

Unio (sec. Elliptio) sloatianus — Simpson (1900), Simpson (1914)
Elliptio (Elliptoideus) sloatianus — Frierson (1927), Haas (1969)
Elliptio sloatianus — Thiele (1934), Clench & Turner (1956)
Nephronaias (Elliptoideus) sloatiana — Haas (1969)
Elliptoideus sloatianus — Burch (1975), Davis (1984), Turgeon et al. (1988), Williams et al. (1993), Lydeard et al. (1996), ... Smith et al. (2020), Smith et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023)
Plectomerus dombeyana — Oesch (1984)
Plectomerus dombeyanus — Howells et al. (1996)

Unio aratus Conrad, 1849
Conrad, 1849. Ann. Mag. Nat. Hist. 4: 302.
Conrad, 1849. Proc. Acad. Nat. Sci. 4: 154.
(homonym of Unio aratus Lea, 1843)

Unio (sec. Elliptio) sloatianus — Simpson (1900), Simpson (1914)
Elliptio (Elliptoideus) sloatianus — Frierson (1927), Haas (1969)
Elliptio sloatianus — Clench & Turner (1956)
Elliptoideus sloatianus — Burch (1975), Brim Box & Williams (2000), Williams et al. (2008), Williams et al. (2014)

Unio plectophorus Conrad, 1849
Conrad, 1849. Proc. Acad. Nat. Sci. 4: 154 [as ‘plectrophorus’].
Conrad, 1850. Jour. Acad. Nat. Sci. 1: 277, pl. 38, fig. 7.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 261 [as ‘Plectomerus plectophorus’].
(correct name for Unio plectrophorus Conrad, 1849)

Unio (sec. Elliptio) sloatianus — Simpson (1900), Simpson (1914)
Elliptio (Elliptoideus) sloatianus — Frierson (1927), Haas (1969)
Elliptio sloatianus — Clench & Turner (1956)
Elliptoideus sloatianus — Burch (1975), Brim Box & Williams (2000), Williams et al. (2008), Williams et al. (2011), Williams et al. (2014)

Unio plectrophorus Conrad, 1849
Conrad, 1849. Proc. Acad. Nat. Sci. 4: 154.
(incorrect original spelling of Unio plectophorus Conrad, 1849)

Elliptio sloatianus — Clench & Turner (1956)
Elliptoideus sloatianus — Williams et al. (2008)

Margaron (Unio) plectoforus Lea, 1852
Lea, 1852. Synopsis Fam. Naiades: corrigenda et addenda.
Lea, 1870. Synopsis Fam. Naiades: 31.
(error for Unio plectophorus Conrad, 1849; reference to Unio plectiforus Lea, 1852)

Elliptio (Elliptoideus) sloatianus — Frierson (1927)

Unio plectiforus Lea, 1852
‘Conrad’ Lea, 1852. Synopsis Fam. Naiades: 21.
(error for Unio plectophorus Conrad, 1849)

Unio aloatinus Haas, 1969
‘Lea’ Haas, 1969. Das Tierreich 88: 213.
(error for Unio sloatianus Lea, 1840)