species Pleurobema decisum (Lea, 1831): synonymy

Unio decisus Lea, 1831

Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 92 [102], pl. 12, fig. 23.
LECTOTYPE [AS HOLOTYPE] USNM_84723 (by Johnson & Baker, 1973: 153), Claiborne, Ala.

Pleurobema (s.s.) decisa — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema decisum — Ortmann (1912), Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), ... Morrison et al. (2021), Hopper et al. (2023), Hauck et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Pleurobema (s.s.) decisus — Frierson (1927)
Pleurobema decisum decisum — Haas (1969)
Pleurobema decisus — Jones et al. (2005)

Unio scalenius Say, 1834

(misidentified reference to Obliquaria (Scalenaria) scalenia Rafinesque, 1820)
Say, 1834. Amer. Conch. 1(6): sp. 35 [synonymy].

Pleurobema (s.s.) decisa — Simpson (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Pleurobema (s.s.) decisus — Frierson (1927)

Unio chattanoogaensis Lea, 1858

Lea, 1858. Proc. Acad. Nat. Sci. 10: 166.
Lea, 1859. Jour. Acad. Nat. Sci. 4 [O. 7]: 209 [27], pl. 25, fig. 90.
LECTOTYPE [AS HOLOTYPE] USNM_84729 (by R.I. Johnson, 1974: 29), Chattanooga, Tenn.

Pleurobema (s.s.) chattanoogaensis — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (Group of P. decisum) chattanoogaense — Simpson (1914)
Pleurobema (s.s.) decisus-chattanoogaensis — Frierson (1927)
Pleurobema decisum chattanoogaense — Haas (1969)
Pleurobema chattanogaense [sic] — Burch (1975)
Pleurobema chattanoogaense — Turgeon et al. (1988), Williams et al. (1993), Parmalee & Bogan (1998), Turgeon et al. (1998), Lydeard et al. (1999), ... Cummings & Graf (2010), ITIS (2012), Ouyang et al. (2015), Inoue et al. (2018), Morrison et al. (2021)
Pleurobema decisum — Williams et al. (2008), Williams et al. (2017), Graf & Cummings (2021)
Pleurobema chattanoogaensis — Hauck et al. (2023)

Unio anaticulus Lea, 1861

Lea, 1861. Proc. Acad. Nat. Sci. 13: 40.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 92 [96], pl. 13, fig. 240.
HOLOTYPE USNM_84735, Columbus, Miss.

Pleurobema (s.s.) decisa — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Unio anaticulus — de Gregorio (1914)
Pleurobema (s.s.) decisus — Frierson (1927)
Pleurobema decisum decisum — Haas (1969)
Pleurobema curtum — Williams et al. (2008)

Unio consanguineus Lea, 1861

Lea, 1861. Proc. Acad. Nat. Sci. 13: 60.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 67 [71], pl. 7, fig. 217.
HOLOTYPE USNM_84726, Cahawba R., Ala.

Pleurobema (s.s.) decisa — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Unio consanguineus — de Gregorio (1914)
Pleurobema (s.s.) decisus — Frierson (1927)
Pleurobema decisum decisum — Haas (1969)
Pleurobema decisum — Williams et al. (2008)

Unio crebrivittatus Lea, 1861

Lea, 1861. Proc. Acad. Nat. Sci. 13: 60.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 43 [47], pl. 15, fig. 41.
HOLOTYPE USNM_84725, Coosawattee R., Ga.

Pleurobema (s.s.) decisa — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Pleurobema (s.s.) decisus — Frierson (1927)
Pleurobema decisum decisum — Haas (1969)
Pleurobema decisum — Williams et al. (2008)

Unio medius Reeve, 1864

(misidentified reference to Unio medius Lea, 1861)
‘Lea’ Reeve, 1864. Conch. Icon. 16: pl. 17, sp. 77.

Pleurobema (s.s.) decisa — Simpson (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)
Pleurobema (s.s.) decisus — Frierson (1927)
Pleurobema decisum decisum — Haas (1969)

Unio decisus Küster, 1852

(reference to Unio decisus Lea, 1831)
‘Lea’ Küster, 1852. Conchyl. Cab. 9(2): 41, pl. 7, fig. 3. [in part]

Pleurobema (s.s.) decisa — Simpson (1900)
Pleurobema (Group of P. decisum) decisum — Simpson (1914)

Pleurobema chattanogaense Burch, 1975

(error for Unio chattanoogaensis Lea, 1858)
‘Lea’ Burch, 1975. Freshw. Unio. North Amer.: 12.