<Emphasis Type="Italic">Terebellides irinae</Emphasis> sp. n., a new species of <Emphasis Type="Italic">Terebellides</Emphasis> (Polychaeta: Terebellidae) from the Arctic Basin

A new polychaete species of the family Terebellidae, Terebellides irinae sp. n., has been described from materials collected in the Canadian Basin by the international Hidden Ocean 2005 expedition on board the US Coast Guard icebreaker (WAGB-20) Healy. The new species differs from other closely related species by its underdeveloped ventral branchial lobes that are at least two times shorter than the dorsal ones, sometimes reduced to barely noticeable cones and in 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 worm are small, no more than 15 mm long.