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What belongs to Arachinida is the largest terrestrial group in the world except for insects, and Araneae is a large group of it. 蛛形纲动物是陆生动物中除昆虫以外最大的类群，蜘蛛目又是蛛形纲中的一个大目，在全球的生物多样性方面排第七位。