Biemna variantia is an encrusting sponge forming small cushions seldom more than 8 cm (3 in) across, 1 to 2 cm (0.4 to 0.8 in) thick in the middle and thinner near the edge. The surface is covered with small conical peaks and … See more

Biemna variantia is found in the Arctic Ocean and northern Atlantic Ocean, from the Gulf of Saint Lawrence and Greenland to the See more

Like other sponges, Biemna variantia draws in water through small pores, filters out organic particles less than 3μm in diameter, and expels … See more