Interstitial polychaetes (Annelida) from the Kandalaksha Bay of the White Sea

Specialized interstitial polychaetes of the White Sea were studied for the first time. About 70 samples from different sites of the Kandalaksha Bay were collected. Sandy, gravel and shell substrates (tidal and subtidal area) were investigated. Microphthalmus aberrans (Hesionidae), Psammodrilus halanoglossoides (Psammodrilid), Protodrilus sp. (Protodrilidae), Micronerilla brevis, Thalassochaetus palpifoliaceus, Meganerilla swedmarki, and Nerillidium gracile were found in the White Sea. Representatives of Pisionidae. Ctenodrilidae, Stygocapitellidae, and Polygordiidae were not recorded. The coarse sandy, gravel and shell substrates Lire densely populated by the eurytopic polychaete species Pterosyllis finmarchica, Exogone gemmifera, Autolytus prolifer, Syllis armillaris (Syllidae), Glycera capitata (Glyceridae), Polycirrus sp. (Tertebellidae), Ephesia gracilis, Sphaerodoropsis sp. (Sphaerodoridae), Ophryotricha irinae (Dorvilleidue). (Capitellidae), and Nereimyra punctata (Hesionidae). Most of these species are dwellers of muddy and sandy substrates or epibionts of macroalgy and other hard substrates.