Shen Collection, Middle Volume. Radical: Insect (chóng). Character: quan. Kangxi strokes: 24. Page 1104, Entry 03.
Pronounced quan.
Classic of Rites (Erya), Explanation of Insects: The quan is also known as the yufu (chariot attendant) or shougua (melon guardian). Commentary: Currently, a small yellow-shelled insect found within melons that likes to eat melon leaves, which is why it is called shougua.
Zhuangzi, Chapter on Perfect Happiness (Zhile): The maw-rui (a type of small insect) is born from the rotting quan.
Also, in the Materia Medica (Bencao), the millipede is also known as maquan.
Also, according to the Explaining Graphs and Analyzing Characters (Shuowen), it is also defined as a large stinger.
Also, in the Classified Dictionary (Leipian), pronounced huan. The meaning is the same.
Also, in the Collected Rhymes (Jiyun), pronounced huan. It refers to a large turtle.