Gyrinus (Neogyrinus) violaceus Régimbart, 1883

Gyrinus violaceus Régimbart, 1883b: 187 (orig. descr.); 1884: 475 (record); 1903a: 8 (record); Bruch 1915: 479 (catalog); Zimmermann 1920: 232 (record); Ochs 1948: 566 (checklist); 1956: 2 (descr.); 1957: 213 (record); 1959: 67 (record); 1960b: 308 (record); Blackwelder 1944: 81 (checklist); Benetti & Régil 2004: 6 (ecology)

Gyrinus coerulescens Ochs, 1935a: 129 (orig. descr.); 1948: 565 (checklist); Jacob 1935: 102, 103, 108 (descr.); Blackwelder 1944: 81 (checklist)[synonymy by Ochs, 1956: 2]

Gyrinus (Neogyrinus) coerulescens Ochs: Ochs 1955: 22 (n. comb.) [synonymy by Ochs, 1956: 2]

Gyrinus (Neogyrinus) violaceus Régimbart: Ochs 1935a: 130 (n. comb.); 1963c: 458 (descr.); Benetti et al. 2003a: 3 (illustr.); 2003b: 38, 42 (record, distr.); Benetti & Garrido 2004: 159 (record, distr.)

DISTRIBUTION: Argentina, Brazil (PR, RS, SC, SP), Paraguay, Uruguay.