are described as eusocial. Eusocial species that lack this criterion of morphological caste differentiation are said to be primitively eusocial.

Two potential examples of primitively eusocial mammals are the naked mole-rat and the Damaraland mole-rat (Heterocephalus glaber and Fukomys damarensis, respectively). Both species are diploid and highly inbred, and they aid in raising their