This crustacean is known from Vancouver Island, Canada, to Mexico.
In adults, the slender terminal portion of the antenna has three segments.
It is common above the high-tide line of marshes, bays and estuaries, and in the spray zone of rocky beaches.
In adults, the front edge of the head is slightly wavy and lacks a central projecting lobe.
In adults, the abdomen is abruptly narrower than the thorax.
An extinction-risk assessment has not been added yet.