The phrase "different castes" refers to social groups or classes that people are born into and cannot easily change. Each caste has its own privileges, rights, and responsibilities. Full definition
Those include: the presence of different castes, including queen ants and workers; groups of worker ants in single pieces of amber, probably nestmates foraging together; and two workers of different ant species engaging in combat. (sciencedaily.com)
Yet the church must self - critically ask itself if it has a nurturing fellowship for converts from different castes or from Islam». (religion-online.org)
He found it possible to show the exact bearing of someone emerging from such and such group into institutional life (executive, legislative, and judicial) on styles of dress or art of the different castes. (religion-online.org)