This crustacean is known from the Aleutian Islands to southern California, USA.
In adult males, the outer uropodal branches have spines along their lower side margins.
It is known from coralline algae and kelp holdfasts.
In adult females, the tail plate is stout, with four upper tubercles.
In adult females, the terminal notch of the tail plate is broad and shallow.
An extinction-risk assessment has not been added yet.