This crustacean is known from southern California, USA, to Mexico.
In adult females, the head is completely embedded in the thorax.
It parasitizes the gills of the crab Pachygrapsus crassipes.
Adult females lack eyes.
In adult females, the abdomen is enclosed by elongated side plates and outer appendage branches with deeply finger-like divided margins.
An extinction-risk assessment has not been added yet.