Why don’t all termite species have a sterile worker caste?

@article{Higashi1991WhyDA,
  title={Why don’t all termite species have a sterile worker caste?},
  author={Masahiko Higashi and Norio Yamamura and Takuya Abe and Thomas P. Burns},
  journal={Proceedings of the Royal Society of London. Series B: Biological Sciences},
  year={1991},
  volume={246},
  pages={25 - 29}
}
No general theory explains why a sterile worker caste is not found in all species of both Hymenoptera and Isoptera (Insecta). Recent empirical findings show that, in the termites (Isoptera), feeding outside the nest correlates well with the evolution of the sterile (true) worker caste from the non-sterile (false) worker caste. Here we explain the connection between food—nest separation and true worker evolution in termites, providing a general theory on the restricted distribution of the… 

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