This crustacean is known from northern California, USA, to Mexico.
In adult females, the head is roughly triangular.
It parasitizes the gills of the porcelain crabs Pachycheles holosericus, Pachycheles pubescens and Pachycheles rudis.
Adult females have eyes.
In adult females, the rudimentary side plates of thoracic segments three and four occur only on the longer side of the body.
An extinction-risk assessment has not been added yet.