In most ant societies, two morphologically different female castes, i.e. winged queen and wingless worker, divide tasks and comprise their societies. The caste developmental fate is determined during postembryonic development and the caste systems are diverse among species. The diversity of caste systems is probably attributed to the diversification of the caste developmental processes. To understand the evolutionary causes that diversified caste systems, we must know the detailed caste developmental processes in ants. In Myrmecina nipponica, some colonies produce intermorphic queens instead of winged queens; therefore, their caste differentiation process during postembryonic development should differ from those of winged queens. In this study, we observed the processes of postembryonic development in M. nipponica, to explore the intermorphic-specific developmental regulation. To investigate the developmental processes of intermorphic queens, the identification of intermorphic-specific characters should be required. Therefore, we observed adult morphological features by using a scanning electron microscope. In intermorphic queens, some body parts were queen-like, while others were worker-like, indicating that intermorphic queens probably invest more energy to reproduction than to dispersal. Since wings and gonads were thought to be responsible for the dispersal and reproduction, respectively, we next observed the wing and gonad development in larval and pupal stages. As the results of histological observations, the pupal wing buds of queens were well-developed, while those of both intermorphic queens and workers were simplified or degenerated. On the other hand, the pupal gonads of intermorphic queens similarly developed to those of queens. Because the developmental timing differed among organs and among castes, the caste-specific characters seemed to be regulated modularly as well as heterochronically.