Unio (Amblema) ovalis Rafinesque, 1819
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 29.

Obliquaria (Plagiola) cliffordiana Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 321 [also as ‘Unio cliffordiana’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 63.

— Simpson (1900), Simpson (1914)
Obliquaria cliffordiana — Burch (1975)

Unio radula Say, 1829
Say, 1829. New Harm. Dissem. 2(20): 323.

Unio radula — Simpson (1900), Simpson (1914)

Bariosta diaphanus Rafinesque, 1831
Rafinesque, 1831. Continuation: 3.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 74.

— Simpson (1900), Simpson (1914), Burch (1975)

Bariosta diploderma Rafinesque, 1831
Rafinesque, 1831. Continuation: 2.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 73.

Bariosta diploderma — Simpson (1900), Simpson (1914)
— Burch (1975)

Bariosta lasmabrachys Rafinesque, 1831
Rafinesque, 1831. Continuation: 3.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 74.

— Simpson (1900), Simpson (1914), Burch (1975)

Bariosta montanus Rafinesque, 1831
Rafinesque, 1831. Continuation: 2.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 73.

— Simpson (1900), Simpson (1914), Burch (1975)

Bariosta diaphanus var. lineolata Rafinesque, 1831
Rafinesque, 1831. Continuation: 3.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 74.
(intro'd as intra-sp. of Bariosta diaphanus Rafinesque, 1831)

Lampsilis fulgens Rafinesque, 1831
Rafinesque, 1831. Continuation: 7.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 84.

Lampsilis fulgens — Simpson (1900), Simpson (1914)
— Bolotov et al. (2022)

Lasmigona sulcata Rafinesque, 1831
Rafinesque, 1831. Continuation: 5.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 79.

Obliquaria rivularis Rafinesque, 1831
Rafinesque, 1831. Continuation: 3.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 76.

— Simpson (1900), Simpson (1914), Burch (1975)

Obliquaria (Aximedia) castaneus Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 76.

— Simpson (1900), Simpson (1914), Burch (1975)

Obliquaria (Scalenaria) fontinalis Rafinesque, 1831
Rafinesque, 1831. Continuation: 3.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 76.

— Simpson (1900), Simpson (1914), Burch (1975)

Obliquaria (Sintoxia) chloris Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 76.

— Simpson (1900), Simpson (1914), Burch (1975)

Sulcularia papyracea Rafinesque, 1831
Rafinesque, 1831. Continuation: 5.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 81.

Alasmidonta papyraceum — Simpson (1900), Simpson (1914)
— Burch (1975)

Toxolasma cinerescens Rafinesque, 1831
Rafinesque, 1831. Continuation: 2.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 72.

— Simpson (1900), Simpson (1914), Burch (1975)

Toxolasma flexus Rafinesque, 1831
Rafinesque, 1831. Continuation: 2.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 73.

— Simpson (1900), Simpson (1914), Burch (1975)

Truncilla granulata Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Truncilla granulatus — Simpson (1900), Simpson (1914)

Truncilla perplexa Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 76.

Truncilla perplexa — Simpson (1900)
Truncilla perplexus — Simpson (1914)

Unio badius Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Unio crenulatus Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Unio elegans Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Unio punctatus Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Unio pustulatus Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Unio scaber Rafinesque, 1831
Rafinesque, 1831. Continuation: 4. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.

Anodon anatinus Sowerby, 1836
Sowerby, 1836. Rich. Faun. Borealé Am. 3: 316.

Anodonta anatinus — Simpson (1900), Simpson (1914)

Unio iridescens Conrad, 1838
Conrad, 1838. Monogr. Fam. Unionidae 2(11): back cover.

Unio iridescens — Simpson (1900), Simpson (1914)

Unio plombarius Villa, 1841
Villa, 1841. Dispos. Syst. Conchyl.: 62.

Unio plombarius — Simpson (1900), Simpson (1914)

Unio altus Conrad, 1854
Conrad, 1854. Jour. Acad. Nat. Sci. 2(4): 298, pl. 27, fig. 5.

Pleurobema (s.s.) alta — Simpson (1900)
Pleurobema (s.s.) altum — Simpson (1914), Frierson (1927)
Pleurobema altum — Haas (1969), Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Pleurobema fibuloides — Williams et al. (2008)
— Graf & Cummings (2021)

Unio taumilapanus Conrad, 1855
Conrad, 1855. Proc. Acad. Nat. Sci. 7: 256.
(renamed Unio tamaulipasensis Fischer & Crosse, 1894)
Type(s): TYPE LOST XXX_UNKNOWN, San Juan River, Taumilapas.

— Martens (1900), Simpson (1900), Graf & Cummings (2021), Cummings et al. (2025)
Unio taumilapanus — Simpson (1914)
Elliptio (Barynaias) tamaulipasensis — Frierson (1927)
Nephronaias (Sphenonaias) taumilapana — Haas (1969)
Quincuncina mitchelli — Howells et al. (1996), R.I. Johnson (1999)
Sphenonaias tanualipana [sic] — Contreras-Arquieta (2000)
Sphenonaias taumilapana — Graf & Cummings (2007), Bogan (2010), Cummings & Graf (2010), Pfeiffer et al. (2016), Czaja et al. (2023)
Sphenonaias taumilapanus — Smith et al. (2020)

Unio tamaulipasensis Fischer & Crosse, 1894
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(16): 621.
(new name for Unio taumilapanus Conrad, 1855)

— Martens (1900)
Unio taumilapanus — Simpson (1914)
Elliptio (Barynaias) tamaulipasensis — Frierson (1927)
Nephronaias (Sphenonaias) taumilapana — Haas (1969)
Quincuncina mitchelli — Howells et al. (1996), R.I. Johnson (1999)

Unio pequottianus Simpson, 1900
‘Linsley’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 744.
‘Linsley’ Simpson, 1914. Descr. Cat. Naiades: 731.
(error for Unio pequottinus Linsley, 1845)

Anodonta foliopsis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 63, pl. 11, figs. 4a-c.

Anodonta foliopsis — de Gregorio (1914)

Anodonta ferussaceana [sic] var. incertopsis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 64, pl. 11, figs. 5a-b.
(intro'd as intra-sp. of Anodonta ferussaciana Lea, 1834)

Anodonta ferussaceana [sic] var. incertopsis — de Gregorio (1914)

Anodonta subcilindracea [sic] var. propexilis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 63, pl. 12, figs. 1a-e.
(intro'd as intra-sp. of Anodonta subcylindracea Lea, 1838)

Anodonta subcilindracea [sic] var. propexilis — de Gregorio (1914)

Unio plenus var. interduos de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 48.
(intro'd as intra-sp. of Unio plenus Lea, 1840)

Unio plenus var. interduos — de Gregorio (1914)

Lampsilis carunculus of Authors, unknown year
Isley 1925 of Authors.

Toxolasma parvus — Howells et al. (1996)

Unio cornutus of Authors, unknown year
Lea 1827 of Authors.
(misidentified reference to Unio cornutus Barnes, 1823)

Dysnomia (s.s.) flexuosa — Frierson (1927)
Dysnomia (Torulosa) torulosa — Frierson (1927)

Mya obovata Lightfoot, 1786
‘S.’ Lightfoot, 1786. Catalogue of the Portland Museum: 100, no. 2190. [nomen nudum]

Unio obovata — Simpson (1900), Simpson (1914)

Potamilus phaiedrus Rafinesque, 1818
Rafinesque, 1818. Amer. Mon. Mag. 3: 355. [nomen nudum]
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 426 [as ‘U. (Proptera) phaiedra’]. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 29.

Unio (Obovaria) crassa Rafinesque, 1819
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 29.

Unio (Pleurobema) conica Rafinesque, 1819
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427. [nomen nudum]
Rafinesque, 1864. [in] Binney & Tryon, reprint: 29.

Alasmodonta coarctata Ravenel, 1834
Ravenel, 1834. Cat. Rec. Shells: 7. [nomen nudum]

Symphynota lasmabranchis Ferussac, 1835
‘Rafinesque’ Ferussac, 1835. Mag. Zool. 5(59-60): 25.
(error for Bariosta lasmabrachys Rafinesque, 1831)

Unio cuneiformis Jay, 1835
Jay, 1835. Cat. Rec. Shells: 16. [nomen nudum]

Brachydonta compressa Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32. [nomen nudum]

Crenodonta trigona Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33. [nomen nudum]

Crenodonta tuberculata Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33. [nomen nudum]

Mysca elegans Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32. [nomen nudum]

Mysca erythros Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32. [nomen nudum]

Schizostoma radians Schlüter, 1838
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 33. [nomen nudum]

Mysca mexicana Swainson, 1840
Swainson, 1840. Treat. Malacol.: 279. [nomen nudum]

Unio pequottinus Linsley, 1845
Linsley, 1845. Amer. J. Sci. 48(2): 277. [nomen nudum]

Unio pequottianus [sic] — Simpson (1900), Simpson (1914)

Unio (Obovaria) orbicularis Mørch, 1853
Mørch, 1853. Cat. Conch. Yoldi 2: 44. [nomen nudum]

Unio pernulus B.H. Wright, 1888
‘Lea’ B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [4]. [nomen nudum]

Anodonta pholiopsis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: pl. 11, caption.
(error for Anodonta foliopsis de Gregorio, 1914)

Unio vareaeformis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 50. [nomen nudum]

— de Gregorio (1914)

Unio taumilipanus R.I. Johnson, 1999
‘Conrad’ R.I. Johnson, 1999. Occ. Pap. Moll. 6(77): 19.
(error for Unio taumilapanus Conrad, 1855)

Sphenonaias tanualipana Contreras-Arquieta, 2000
‘Conrad’ Contreras-Arquieta, 2000. Mexicoa 2(1): 44.
(error for Unio taumilapanus Conrad, 1855)