The soft-shelled turtle belongs to the family Trionychidae. In China, soft-shelled turtle has many common names, such as tortoise, soft-shelled turtle and mud turtle. Among them, turtle is the most common generic name.
As a member of turtles, there are more than 20 different species in the world. As the most common soft-shelled turtle in China, Chinese soft-shelled turtle is almost distributed in freshwater areas all over China (except Tibet and Xinjiang), so the most common soft-shelled turtle is called "turtle" instead of turtle.
As for the name turtle, it is easy to understand. Turtle is a creature that lives in fresh water. It often swims in the water like a fish, and has a hard shell on its back, so it has the name "turtle".
Introduction:
The tortoise belongs to the family Trionychus, and the tortoise belongs to the family Trionychus. The difference between them is like the difference between a tiger and a bear (both belong to Carnivora, one is a cat and the other is Xiong Ke). The classification of organisms is based on their genetic similarity. The closer the species are, the closer the genetic relationship is. For example, animals belonging to the same family are more closely related than animals belonging to the same family, while turtles are different from families, so the relationship is very far.