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Data last updated
Mon 1 Dec 2025

genus Epioblasma Rafinesque, 1831: synonymy

28 Recent freshwater species (29 total species)

Synonymy

Epiloblasma Meek, 1876

‘Rafinesque’ of Authors.
Meek, 1876. Rept. U.S. Geol. Surv. Terr. (Hayden) 9: 511.
Modell, 1964. Arch. Moll. 93: 96.
(error for Epioblasma Rafinesque, 1831)
Type species: Epioblasma biloba Rafinesque, 1831 = Epioblasma rangiana

Dysnomya Meek, 1876

Meek, 1876. Rept. U.S. Geol. Surv. Terr. (Hayden) 9: 512.
(error for Dysnomia Agassiz, 1852)
Type species: Obliquaria (Quadrula) flexuosa Rafinesque, 1820 = Epioblasma flexuosa

Pilea Simpson, 1900

Simpson, 1900. Proc. U.S. Nat. Mus. 22: 522.
Simpson, 1914. Descr. Cat. Naiades: 22.
(intro'd as sub-gen. of Truncilla Rafinesque, 1819)
Type species: Unio personatus Say, 1829 (original designation) = Epioblasma personata

Truncillopsis Ortmann & Walker, 1922

Ortmann & Walker, 1922. Occ. Pap. Mus. Zool. Univ. Mich. (112): 65.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Truncilla triqueter Rafinesque, 1820 (orig. desig.) = Epioblasma triquetra

Scalenilla Ortmann & Walker, 1922

Ortmann & Walker, 1922. Occ. Pap. Mus. Zool. Univ. Mich. (112): 68.
Ortmann, 1924. Amer. Midl. Nat. 9(1): 43.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio sulcatus Lea, 1829 (orig. desig.) = Epioblasma obliquata

Obliquata Frierson, 1927

Frierson, 1927. Check List N. Amer. Naiades: 52.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Obliquaria (Scalenaria) obliquata Rafinesque, 1820 (orig. desig.) = Epioblasma obliquata

Penita Frierson, 1927

Frierson, 1927. Check List N. Amer. Naiades: 93.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio penitus Conrad, 1834 (orig. desig.) = Epioblasma penita

Torulosa Frierson, 1927

Frierson, 1927. Check List N. Amer. Naiades: 94.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Amblema torulosa Rafinesque, 1820 (orig. desig.) = Epioblasma torulosa

Capsaeformis Frierson, 1927

Frierson, 1927. Check List N. Amer. Naiades: 95.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio capsaeformis Lea, 1834 (orig. desig.) = Epioblasma capsaeformis

Dysonomia Paetel, 1890

‘Agassiz’ Paetel, 1890. Cat. Conch.-Samml. 3: 143.
(error for Dysnomia Agassiz, 1852)
Type species: Obliquaria (Quadrula) flexuosa Rafinesque, 1820 = Epioblasma flexuosa

Epilobasma Simpson, 1900

Simpson, 1900. Proc. U.S. Nat. Mus. 22: 744.
(error for Epioblasma Rafinesque, 1831)
Type species: Epioblasma biloba Rafinesque, 1831 = Epioblasma rangiana

Pilaea Starobogatov, 1970

‘Lea’ Starobogatov, 1970. Fauna Moll. Continent.: 70.
(error for Pilea Simpson, 1900)
Type species: Unio personatus Say, 1829 = Epioblasma personata

Taxonomic History (since 1900)

The Taxonomic History lists the ways authors have classified the species currently assigned to Epioblasma, since 1900.

Truncilla (s.s.) — Simpson (1900), Wright & Walker (1902), Simpson (1914)
Truncilla (Scalenaria) — Simpson (1900), Simpson (1914)
Truncilla (Dysnomia) — Simpson (1900), Simpson (1914)
Truncilla (Pilea) — Simpson (1900), Ortmann (1909), Simpson (1914)
Unio (s.s.) — Call (1900)
Truncilla — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912), Vanatta (1915), Utterback (1916), Ortmann (1918)
Epioblasma — Simpson (1914), Turgeon et al. (1988), Cummings & Mayer (1992), Williams et al. (1993), Bogan (1993), ... Graf & Cummings (2021), Bieler (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)
Unio — de Gregorio (1914), Henderson (1935)
Dysnomia (Truncillopsis) — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), F.C. Baker (1928), Haas (1969), Haas (1969)
Dysnomia (Scalenilla) — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Haas (1969)
Dysnomia (Pilea) — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), Haas (1930), Haas (1969), Haas (1969)
Dysnomia (s.s.) — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), Haas (1930), Haas (1969), Haas (1969)
Quadrula (Obliquata) — Frierson (1927), Haas (1930), Haas (1969), Haas (1969)
Dysnomia (Penita) — Frierson (1927), Modell (1957), Haas (1969), Haas (1969)
Dysnomia (Torulosa) — Frierson (1927), Haas (1930), Haas (1969), Haas (1969)
Dysnomia (Capsaeformis) — Frierson (1927), Haas (1969), Haas (1969)
Dysnomia — F.C. Baker (1928), Russell (1934), Murray & Leonard (1962), Stansbery (1970), Burch (1975), Gordon et al. (1979), Mackie et al. (1980), ITIS (2012)
Epioblasma (s.s.) — Thiele (1934)
Epioblasma (sec. Truncillopsis) — Thiele (1934)
Epioblasma (sec. Pilea) — Thiele (1934)
Epioblasma (sec. Penita) — Thiele (1934)
Epioblasma (sec. Torulosa) — Thiele (1934)
Epioblasma (sec. Capsaeformis) — Thiele (1934)
Epioblasma (sec. Scalenilla) — Thiele (1934)
Pleurobema — Morrison (1969), Vidrine (1993)
Plagiola — Morrison (1969), R.I. Johnson (1980), Oesch (1984)
Plagiola (Epioblasma) — Morrison (1969), R.I. Johnson (1978)
Obliquaria — Burch (1975)
Plagiola (Truncillopsis) — R.I. Johnson (1978)
Plagiola (s.s.) — R.I. Johnson (1978)
Plagiola (Torulosa) — R.I. Johnson (1978)
Plagiola (Pilea) — R.I. Johnson (1978)
Pleurobema (Sintoxia) — Campbell & Lydeard (2012)

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