How do you say arthropod in Chinese?
— 节肢动物; 节肢动物

Specialized synonyms for arthropod in Chinese
centipede蜈蚣 (wúgōng)
insect昆蟲, 昆虫 (kūnchóng), 蟲子, 虫子 (chóngzi)
millipede馬陸, 马陆 (mǎlù), 千足蟲, 千足虫 (qiānzúchóng)