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nominal species Unio cilindricus [sic] var. acrispatus de Gregorio, 1914

Unio cilindricus [sic] var. acrispatus de Gregorio, 1914 = Theliderma cylindrica

de Gregorio, 1914. Il Nat. Siciliano 2: 41, pl. 4, figs. 2a-b.
(intro'd as intra-sp. of Unio cylindricus Say, 1817)

Taxonomic Opinions

+ Theliderma cylindrica (Say, 1817) — Lopes-Lima et al., 2019: 6 [Suppl. Appendix 2].

+ Quadrula cylindrica cylindrica (Say, 1817) — Watters et al., 2009: 266.

= Unio cilindricus [sic] var. acrispatus de Greg. — de Gregorio, 1914: 41, pl. 4, figs. 2a-b.