All members of family Atyidae can be distinguished from other shrimp by their overall length as well as the extent length of their pincer-like claws and manifestation of terminal bristles (setae) at the tips of the first and second chelae. A short spine above the eye and the angled articulation of the second chelae with the carpus differentiate the California freshwater shrimp from other shrimp that occur California. A carapace length (reckoned from eye socket to tail-tip) of slightly more than five centimeters can be attained.