What turtle is red under its shell?

Chinese grass turtle, commonly known as tortoise, is one of the most widely distributed and abundant turtles in China. China has regarded it as a symbol of health and longevity since ancient times. China grass turtle is very popular in the international market. People in Japan, the Philippines, Europe and America regard it as a symbol of "good luck and long life". Chinese name: Chinese grass turtle; Nicknames: tortoise, golden turtle, ink turtle, mud turtle, mountain turtle, smelly turtle and longevity turtle.