species Plethobasus cicatricosus (Say, 1829): synonymy

Unio cicatricosus Say, 1829

Say, 1829. New Harm. Dissem. 2(19): 292, sp. 2.
Say, 1858. [in] Binney, Compl. Writings T. Say: 131.
Type(s): NEOTYPE SMF_4539, N. Amerika.

Pleurobema (sec. Plethobasus) cicatricosa — Simpson (1900)
Pleurobema (sec. Plethobasus) cicatricosum — Simpson (1914)
Plethobasus cyphyus — Ortmann & Walker (1922), Burch (1975)
Pleurobema (Plethobasus) cyphyum — Frierson (1927)
Pleurobema (Plethobasus) cicatricosum — Haas (1930)
Plethobasus cicatricosus — Haas (1969), Stansbery (1970), R.I. Johnson (1980), Turgeon et al. (1988), Cummings & Mayer (1992), ... Williams et al. (2017), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)
Plethobasus pachosteus — Morrison (1969)

Unio varicosus Lea, 1831

(homonym of Unio varicosa Lamarck, 1819)
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 90 [100], pl. 11, fig. 20.
Type(s): HOLOTYPE USNM_84320, Cincinnati, Ohio.

Pleurobema (sec. Plethobasus) cicatricosa — Simpson (1900)
Unio (s.s.) varicosus — Call (1900)
Pleurobema (sec. Plethobasus) cicatricosum — Simpson (1914)
Unio varicosus, var. — de Gregorio (1914)
Plethobasus cyphyus — Ortmann & Walker (1922), Burch (1975)
Pleurobema (Plethobasus) detectum — Frierson (1927)
Plethobasus cicatricosus — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), IUCN (2011)

Unio cicatricoides Frierson, 1911

Frierson, 1911. Nautilus 25(5): 53, fig. 2, upper fig.
Type(s): HOLOTYPE UMMZ_80521, Wabash River, Indiana.

Pleurobema (sec. Plethobasus) cicatricosum — Simpson (1914)
Pleurobema (Plethobasus) cicatricoideum [sic] — Frierson (1927)
Plethobasus cicatricosus — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio detectus Frierson, 1911

Frierson, 1911. Nautilus 25(5): 52, pls. 2 , lower fig.; pl. 3, upper fig.
Frierson, 1927. Check List N. Amer. Naiades: 45, sp. 202.
Type(s): HOLOTYPE UMMZ_81937, Ohio River.

Pleurobema (sec. Plethobasus) cicatricosum — Simpson (1914)
Pleurobema (Plethobasus) detectum — Frierson (1927)
Plethobasus cicatricosus — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), IUCN (2011)

Plethobasus pachosteus ‘Rafinesque’ of Authors

(misidentified reference to Obovaria pachostea Rafinesque, 1820)
‘Rafinesque’ of Authors.
Morrison, 1969. AMU Annual Rept. (1969): 24.
R.I. Johnson, 1980. Bull. MCZ 149(2): 90.

Plethobasus cicatricosus — Parmalee & Bogan (1998), Watters et al. (2009), IUCN (2011)

Unio cicatricosus Reeve, 1864

(reference to Unio cicatricosus Say, 1829)
Reeve, 1864. Conch. Icon. 16: pl. 8, sp. 31; pl. 13, fig. 50.

Pleurobema (sec. Plethobasus) cicatricosa — Simpson (1900)

Pleurobema (Plethobasus) cicatricoideum Frierson, 1927

(error for Unio cicatricoides Frierson, 1911)
Frierson, 1927. Check List N. Amer. Naiades: 45, sp. 203.