Crustacean whose body is divided into 21 segments: 6 segments of the head region, 8 segments compose the thorax and seven segments form the abdomen. The body is black-green or brown-green. The eyes are in the first segment of the head. The second segment of the head has antennas with detector hairs. It has ten legs, five pairs are articulated and extend from the region of the thorax. The first pair of these legs extends toward the head and has claws at the end.