节肢动物，一种节肢动物分类的节肢动物门无脊椎动物，包括昆虫，甲壳纲动物，蛛形纲动物和多足纲节肢动物，其特征为有一甲壳质成对连接副肢的外骨骼和分节的身体

• any of numerous invertebrate animals of the phylum Arthropoda,including the insects,crustaceans,arachnids,and myriapods,that are characterized by a chitinous exoskeleton and a segmented body to which jointed appendages are articulated in pairs