On some Calcaronea (Porifera: Calcarea) from the Barents Sea and adjacent Polar Basin.

Four common calcareous sponge species from the Arctic are described. One species, Sycandra rappi Morozov sp. nov.

A preliminary account of the Arctic/Subarctic Suberites (Porifera: Demospongiae) fauna.

Sponges of the genus Suberites are quite polymorphic and diverse, yet the delimitation of species within the group has always been challenging since there are only a few spicule types that show little, or sometimes no variation in closely allied species. Koltun (1966) created a variety, S. domuncula var.