A specialized level in a colony of social insects, such as ants, in which the members, such as workers or soldiers, carry out a specific function.

• 有社会组织的昆虫的阶级群居动物，如蚂蚁的聚居地中的一个特殊阶层，其成员如工蚁或兵蚁在其中发挥特殊的作用