China ancient Xuanwu turtle refers to what turtle now?

Xuanwu appears as a combination of tortoise and snake. In ancient times, people thought snakes were witty, clever and good at collecting money, and it was generally believed that dreaming snakes predicted wealth. However, the turtle has hard armor on its abdomen and back, and its head, tail and limbs can be retracted into the armor, so it is hungry and thirsty, and its life span is very long. People use turtles for divination and scorpions for divination, which are collectively called tortoise divination. The texture on the turtle's back is called tortoise inscription. When divining, the tortoise shell is burnt and cracked lines are seen, indicating good or bad luck.