This crustacean is known from northern and southern California, USA.
In adults, the upper body has large, raised tubercles that are most developed on the head.
It occurs beneath stones, driftwood, decaying eelgrass and other debris along the high-tide line of marshes, bays and estuaries.
In adults, the hind edges of all body segments except the tail plate have evenly spaced minute tubercles.
In adults, the fourth basal antennal segment has a projection on its outer margin.
An extinction-risk assessment has not been added yet.