A, male: lobster abdomen to swim foot specialization into the connector, stick-shaped; female: in the cephalothorax and abdomen junction of a round spermatheca; up to sexual maturity of the lobster, the male individual is significantly larger than the female.

Two, male: lobster feet thick, lobster feet at both ends of the outer side of a bright red warts, female: lobster feet relatively small, most female feet on the inside of no red warts, even if there is a color is light.

Three, male: the genital pore opening at the base of the fifth pair of footsteps, female: the genital pore opening at the base of the third pair of footsteps; sexually mature female shrimp abdomen is enlarged, male shrimp abdomen is relatively narrow.

Expanded information:

Lobster cephalothorax is thicker, the shell is hard, colorful, the abdomen is short, the length of the body is generally in the 20 to 40 centimeters between the weight of 0.5 kg. Up and down, is the largest class of shrimp. The heaviest can reach more than 5 kilograms, known as lobster tiger.

The body was thick cylindrical, slightly flat dorsal and ventral, cephalothoracic armor developed, thick and thoracic spines, the central anterior edge of a pair of powerful supraocular spines, with a closed gill chamber. The abdomen is shorter and thicker, with the posterior part curling toward the ventral surface, and the tail fan is broad and short. The lobster has a hard, segmented exoskeleton.

The thoracic bole has five pairs of legs, one or more of which are often deformed into chelae, and the chelae on one side are usually larger than those on the opposite side. The eyes are located on movable eyestalks. There are two pairs of long antennae. The abdomen is long, with many pairs of swimming feet, and the tail is finned for swimming, and the curved movements of the tail and abdomen can push the body forward.

Baidu Encyclopedia - Lobster