Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks, characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.

• 蜘蛛纲动物一种蜘蛛纲节肢动物们，如蜘蛛、蝎子、小虫及扁虱，特征是有四对分节的腿和分为两部分即头胸部及腹部的身体