Plinthisus (Plinthisus) cautus Popov, 1965: 219. New name for horvathi Popov, 1964.
Plinthisus (Plinthisus) horvathi Popov, 1964: 701 (junior primary homonym of Plinthisus horvathi Saunders, 1878). LT (Popov, 1965: 220, 221, as HT): male, Kirgizia, Fergana Range, Karasu River, 3 km downstream of Kenkol-Say; ZMAS.