<i>Terebellides irinae </i>sp. n., a new species of <i>Terebellides</i> (Polychaeta: Terebellidae) from the Arctic basin
A new polychaete species of the family Terebellidae, <i>Terebellides irinae </i>sp. n., is described from materials collected in the Canadian Basin by the international expedition "Hidden Ocean 2005" on board the US Coast Guard icebreaker (WAGB-20) <i>Healy</i>. The new species differs from closely related species in that its ventral branchial lobes are underdeveloped and at least two times shorter than the dorsal ones, sometimes reduced to barely noticeable cones; and that the aciculum-like neurochaetes of the 6th setigerous segment are curved at a right angle and have a thin capillaceous tip. Specimens of this polychaete are small, no more than 15 mm long.