Abstract
Idotea (Idotea) obscura n. sp. is characterized by a deeply concave supra-antennal line, 12–15 flagellar articles on antenna 2, absence of setae on the outer border of maxillipedal palp segment 4, three long plumose setae on outer border of basipodite of maxilliped, epimera of pereonite 6 occupying the entire lateral margin, and an elongate, pointed median projection of the pleotelson. This species is closely related to Idotea (I.) fewkesi and Idotea (I.) ochotensis, and is found in both open and protected coast lines from North of Goshen Island, British Columbia to Port Gravina, Alaska in the intertidal zone to about 21 m depth.
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