This crustacean is known from Oregon to southern California, USA.
In adults, side plates are visible from above on thoracic segments five to seven, and occasionally segment four.
It commonly occurs on surfgrass of the genus Phyllospadix in the intertidal zone.
In adults, the rear edge of the tail plate is convex, without a central projection.
In adults, the front projection of the head has a central notch at its tip.
An extinction-risk assessment has not been added yet.