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nominal species Quadrula biangulata Morrison, 1942

Quadrula biangulata Morrison, 1942 = Theliderma intermedia

Morrison, 1942. Bulletin Bur. Amer. Ethnol. 129: 356.
Type(s): HOLOTYPE USNM_84221, Tuscumbia, Alabama.

Taxonomic Opinions

+ Theliderma intermedia (Conrad, 1836) — Lopes-Lima et al., 2019: 6 [Suppl. Appendix 2].

+ Quadrula intermedia (Conrad, 1836) — Williams et al., 2008: 661.

+ Quadrula quadrula (Rafinesque, 1820) — Parmalee & Bogan, 1998: 221.

+ Quadrula tuberosa (Lea, 1840) — R.I. Johnson, 1980: 88.