Alasmidonta marginata Say, 1818
Say, 1818. Jour. Acad. Nat. Sci. 1(11): 459.
Say, 1819. Nich. Encyc. 4: sp. 1.
Say, 1858. [in] Binney, Compl. Writings T. Say: 62.

Alasmidonta (Rugifera) marginata — Simpson (1900), Ortmann (1909), Simpson (1914)
Unio (Margaritana) marginata — Call (1900)
Alasmidonta marginata — Fox (1901), Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912), ... Hopper et al. (2023), Dai et al. (2025), Perkins et al. (2025), FMCS (2025), Chen et al. (2025)
— de Gregorio (1914)
Alasmidonta (Decurambis) marginata — Ortmann (1918), Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), Haas (1969), Haas (1969), R.I. Johnson (1970), Clarke (1981), Graf & Cummings (2007), Campbell & Lydeard (2026)
Decurambis marginata — Frierson (1927)
Alasmidonta (s.s.) marginata — Burch (1975)
Alasmidonta sp. — Araujo et al. (2018)

Unio rugulosus Wood, 1828
Wood, 1828. Suppl. Index Testac.: 3 [as ‘Mya rugulosa’]. [nomen nudum]
Wood, 1828. Suppl. Index Testac.: 57, pl. 1, sp. 7.

Alasmidonta (Rugifera) marginata — Simpson (1900)
Alasmidonta (Rugifera) varicosa — Simpson (1914)
Alasmidonta (Decurambis) varicosa — R.I. Johnson (1970)
Alasmidonta (s.s.) varicosa — Burch (1975)
Alasmidonta (Decurambis) marginata — Clarke (1981)
Alasmidonta marginata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Decurambis scriptum Rafinesque, 1831
Rafinesque, 1831. Continuation: 5.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 80.

Alasmidonta scriptum — Simpson (1900), Simpson (1914)
Alasmidonta (Decurambis) marginata — Ortmann & Walker (1922), F.C. Baker (1928), Haas (1969), Haas (1969), Clarke (1981), Graf & Cummings (2007)
Decurambis marginata — Frierson (1927)
Alasmidonta (s.s.) marginata — Burch (1975)
Alasmidonta marginata — Williams et al. (2008), Watters et al. (2009)

Alasmodonta truncata Lea, 1836
‘Say, in lit.’ of Authors.
Lea, 1836. Synopsis Fam. Naiades: 44.
Lea, 1838. Synopsis Fam. Naiades: 27.
Agassiz, 1852. Arch. Naturg. 18(1): 46.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 262.
(intro'd as syn of Alasmidonta marginata Say, 1818)

Alasmidonta (Rugifera) truncata — Simpson (1900)
Alasmidonta (Rugifera) marginata — Simpson (1914)
Decurambis marginata — Frierson (1927)
Alasmidonta (Decurambis) marginata — Haas (1969)
Alasmidonta marginata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Margaritana marginata Küster, 1862
‘Say’ of Authors.
Küster, 1862. Conchyl. Cab. 9(2): 297, pl. 99, fig. 3.
Sowerby, 1866. Conch. Icon. 16: pl. 51, sp. 267.
(reference to Alasmidonta marginata Say, 1818)

Alasmidonta (Rugifera) truncata — Simpson (1900)
Alasmidonta (Rugifera) marginata — Simpson (1914)
Alasmidonta marginata — Watters et al. (2009)

Margaritana marginata var. truncata B.H. Wright, 1898
B.H. Wright, 1898. Nautilus 11(11): 124.
(intro'd as intra-sp. of Alasmidonta marginata Say, 1818)
Type(s): LECTOTYPE USNM_150545, Clinch R., Va.

Alasmidonta (Rugifera) truncata — Simpson (1900)
Alasmidonta marginata — Ortmann (1909), R.I. Johnson (1980), Strayer & Jirka (1997), Watters et al. (2009)
Alasmidonta (Rugifera) marginata — Ortmann (1909)
Alasmidonta (Decurambis) marginata truncata — F.C. Baker (1928)
Alasmidonta (Decurambis) marginata — Clarke (1981)

Unio calceolus f.a sciotincola de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 54, pl. 9, figs. 3a-d.
(intro'd as intra-sp. of Unio calceolus Lea, 1828)

Unio calceolus f.a sciotincola — de Gregorio (1914)
Alasmidonta marginata — Watters et al. (2009)

Alasmidonta (Decurambis) marginata susquehannae Ortmann, 1919
Ortmann, 1919. Mem. Carnegie Mus. 8(1): 187, pl. 12, fig. 4.
(intro'd as intra-sp. of Alasmidonta marginata Say, 1818)
Type(s): LECTOTYPE CM_61.4679 (by Parodiz, 1967: 26), Susquehanna River, Selins Grove, Snyder County, Pennsylvania.

Decurambis marginata — Frierson (1927)
Alasmidonta (Decurambis) marginata — Haas (1969), Clarke (1981)
Alasmidonta (s.s.) marginata — Burch (1975)
Alasmidonta marginata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Alasmidonta (Decurambis) marginata variabilis F.C. Baker, 1928
F.C. Baker, 1928. Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 194, pl. 69, figs. 4-9.
(intro'd as intra-sp. of Alasmidonta marginata Say, 1818)
Type(s): LECTOTYPE UMMZ_209183 (by Franzen, 1957: 33), Red Cedar R., Chetek, Wis.

Alasmidonta (Decurambis) marginata variabilis — F.C. Baker (1928)
Alasmidonta marginata — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Alasmidonta (Decurambis) marginata — Clarke (1981)

Decurambis literata Rafinesque, 1831
Rafinesque, 1831. Continuation: 5. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 80.
(intro'd as syn of Decurambis scriptum Rafinesque, 1831)

Mya regulosa Lea, 1836
‘Wood’ Lea, 1836. Synopsis Fam. Naiades: 44.
‘Wood’ Lea, 1838. Synopsis Fam. Naiades: 27.
‘Wood’ Lea, 1852. Synopsis Fam. Naiades: 42.
‘Wood’ Lea, 1870. Synopsis Fam. Naiades: 67.
(error for Unio rugulosus Wood, 1828)