Halacarus subtilis Viets, 1940

Report associated with sponges: This species was reported among sponge Aplysina sp. from Rovinj (Rovigno), Croatia (Adriatic Sea, Mediterranean Sea) (Viets 1940); among Aplysina aerophoba from Split, Croatia (Adriatic Sea, Mediterranean Sea) (Viets 1939).

Remarks: This species was also reported in mud at 20 m depth from Rovinj (Adriatic Sea, Mediterranean Sea) (Viets 1940).