Clathrina clathrus - Yellow lattice sponge - Gele traliekalkspons

Clathrina clathrus  (Schmidt, 1864)

Yellow lattice sponge - Gele traliekalkspons

Calella reefs, Los Ullastres, Costa Brava, Spain, 3-6-2015. With Parazoanthus axinellae (Yellow cluster anemone).