In sexually mature lobsters, males are significantly larger than females;

2

The male dragon's foot is thick, and there is a bright red soft wart on the outside of both ends of the dragon's foot, while the female dragon's foot is relatively small, and most of the female feet have no red soft wart, even if there is color, it is pale;

three

The male genital hole is opened at the base of the fifth pair of feet, while the female genital hole is opened at the base of the third pair of feet;

four

The abdomen of sexually mature female shrimp is enlarged, while that of male shrimp is relatively narrow.