Termites
Caste System
The individuals making up a termite community are anatomically and functionally distinct from each other, depending upon their role within the community. The particular duty that each termite performs determines the specific caste to which each termite belongs. Each caste can perform only a certain task, and individual termites cannot stay alive without the rest of the colony. In total, there are four basic kinds of adult termite castes: the king and queen (primary reproductives), the supplementary reproductives, the soldiers, and the workers.
Additional topics
Science EncyclopediaScience & Philosophy: Swim bladder (air bladder) to ThalliumTermites - Caste System, Reproductives, Workers, Soldiers, The Mature Colony