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Mating Eelgrass Isopods. Concave posterior margin of pleotelson can be seen in the third photo (no other local isopods have this, good identifier).
Typically among eelgrass and kelp; Range: Alaska to Mexico
Also classified as 'Pentidotea resecata', 'Idothea resecata' Other Common Names: Kelp isopod, concave isopod, transparent isopod, kelp isopod, seaweed isopod, cut-tailed isopod.