Thirteen species of the Anonyx nugax group (uropod 2 partially constricted) are listed for the North Pacific and adjacent Arctic ocean. Two new species, Anonyx beringi and Anonyx barrowensis are described; A. pacificus Gurjanova, A. anivae Gurjanova,

In place of the widely ranging, abundant, and variable species Anonyx nugax, previously recorded from Canadian Atlantic and Arctic waters, eight less variable species of this genus are here recognized, one of which (sarsi) is new to science. Detailed

Mandible morphology, maximum body length, and gut contents of six species of Anonyx from the Saint Lawrence Estuary were examined. All species are primarily carrion feeders, which is consistent with the morphology of the mandibles. They divide into two