Protoschmidtia simplex f. caucasica Czerniavsky, 1880

Protoschmidtia simplex f. caucasica Czerniavsky, 1880: 95 (no illustration).

Described by Czerniavsky from Sinus Novorossijsk, Black Sea coast of Russia, approximate coordinates 44.68°N 37.82°E (no type material identified in ZIN-RAS but possibly it is ZIN-RAS 11416 labeled as Protoschmidtia simplex). As proposed above this is a junior synonym of Haliclona caucasica (Czerniavsky, 1880) .