What does the radical of "turtle" read?

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[Guo] A family of reptiles, which have hard armor on the abdomen and back, and the head, tail and feet can be retracted into the armor. They are hungry and thirsty, and have a long life. ~ armor (the abdominal armor of turtle, which can be used as medicine, and the ancients also used it for divination and currency. Also known as "tortoise shell"). 【 jūn 】 with "ū". [Qi Qi] [~ z (cí)] The name of the Western Regions in China in Han Dynasty is in the area of Kuche County, Xinjiang Uygur Autonomous Region today.