One new species of Krøyer, 1842 (Amphipoda, Stegocephalidae) described from a seamount of the Caroline Plate, NW Pacific.

A new species of the subfamily Stegocephalinae, , is described from a seamount in the Caroline Plate. Two related species, (Moore, 1992) and (Gurjanova, 1962), were previously reported in the North Pacific. Important morphological characters which differentiate from are found in antenna 1, the mouthparts, pereopod 7 and the length of rami of uropods 2 and 3. The new species differs from by characters of antenna 1, the mouthparts and the shape of epimeral plate 3. Additionally, the morphological differences between the new species and the remaining seven species of are also presented.