Thalassarachna hexacantha (Viets, 1927)
Report associated with sponges: Caspers (1951) reported this species extracted from a sponge at 8 m depth off Varna, Bulgaria, Black Sea .
Remarks: Bartsch (1998) commented that the record of Caspers (1951) is in need of verification. Thalassarachna hexacantha found amongst shallow water algae (Bartsch 2020).