The oval shell has three thorns from beginning to end. The crustacean is olive, brown, dark brown or even black, with obvious papules or small tumors, which vary in size depending on subspecies, but the older the crustacean, the smoother it will become. The abdominal armor is cross-shaped, shaped like a musk turtle, and the color of the abdominal armor is lighter than that of the dorsal armor. The neck is long and thick, the head is big and the beak is pointed; The tail is thick and long, and the epidermis is serrated; The neck, feet and tail are covered with tiny lumps or small tumors.

The carapace is slightly raised, with serrated edges on the back, which is square and dark in color. The shape of the carapace is generally narrow at the front and wide at the back. The width of the third spine guard plate is not more than one third of the width of the whole carapace, which is narrower than that of the second rib guard plate. The length of the front page of the abdominal nail should not exceed 40% of its dorsal nail. The head is short, the snout is slightly pointed, and the upper and lower jaws usually have black stripes. Generally, the carapace of larvae is black or dark brown, and it turns brown and grayish brown in adulthood. The carapace is generally black, red, orange or with red and orange spots. The larvae of this subspecies are fearless, active, relatively docile and cold-resistant.