Females are always larger than males. Females can weigh more than 1,000 grams, and males rarely exceed 500 grams.

The carapace of male turtles is long and slightly flat, and the tail is thicker and longer; the carapace of female turtles is thicker and the tail is shorter.

In addition, the back of the male turtle is arched higher and the top is pointed , the rear edge of the plastron is slightly pointed, the tail is long, the cloacal hole is far from the base of the tail, the back of the female turtle is less arched, but the top is blunt, the rear edge of the plastron is slightly semicircular, the tail is thick and short, and the cloacal hole is far from the tail. The base is closer.