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nominal species Quadrula (Rotundaria) quadrata Simpson, 1914

Quadrula (Rotundaria) quadrata Simpson, 1914 = Psoronaias crocodilorum

Simpson, 1914. Descr. Cat. Naiades: 911.
Type(s): LECTOTYPE USNM_128996 (by R.I. Johnson, 1975: 18), Usumacinta River, Guatemala.

Taxonomic Opinions

+ Psoronaias crocodilorum (Morelet, 1849) — Cummings et al., 2025: 318, pl. 64 bottom right.

= Psoronaias quadrata (Simpson, 1914) — Graf & Cummings, 2021: 20.

= Psorula quadrata Simpson, 1914 — Bogan, 2010: [web].

= Psorula quadrata (Simpson, 1914) — Graf & Cummings, 2007: 309.

= Psorula quadrata (Simpson, 1914) — Haas, 1969: 320.

= Amblema (Psorula) quadrata Simpson — Haas, 1930: 319.

= Rotundaria quadrata (Simpson) — Haas, 1929: 334, figs. 14-15.

= Psoronaias quadrata (Simpson, 1914) — Frierson, 1927: 64, sp. 284.

= Quadrula (Rotundaria) quadrata n. s. — Simpson, 1914: 911.