Two new species of (Copepoda, Harpacticoida, Canthocamptidae) from the Russian Arctic and comparison with (Claus, 1863).

Two new species of Chappuis, 1929 from the Russian Arctic from the species group are described: and A complete morphological comparison of the new species with the type species (Claus, 1863) was carried out. Significant interspecific differences were shown at the level of microcharacters, such as integumental sensillae and pores, ornamentation of segments of mouthparts and swimming legs, and pores on swimming legs. A significant correlation has also been shown in the shape of the caudal rami of the females and the antennules of the males, which is likely caused by an evolutionary sexual arms race.

Two new Canthocamptidae (Copepoda, Harpacticoida) from sponges of the Kara and Laptev Seas.

We studied copepods washed off the sponges from two Arctic seas: the Kara and the Laptev. We found new species in families Miraciidae, Canthocamptidae Brady, 1880, Argestidae, and Ectinosomatidae. We describe two new species of the Canthocamptidae Brady, 1880.

A new species of Maraenobiotus (Copepoda, Harpacticoida) from Lena River Delta (North-Eastern Siberia).

A new species of harpacticoid copepod of the family Canthocamptidae, Maraenobiotus supermario sp. nov. is described.