This crustacean is known from Alaska, USA, to waters off the US–Mexico border.
In adult females, the head is separate, typically hemispherical, and visible from above or below.
It is an external parasite on the carapace of the shrimp Pasiphaea pacifica.
In adult females, thoracic segmentation is usually visible from the sides through four side plates.
In adult females, the abdomen projects rearward as an unsegmented cone-shaped prominence.
An extinction-risk assessment has not been added yet.