A hole dwelling holothurian symbiotic crab was collected in the low tidal mark in Namhae Island. The crab was identified as Asthenognathus inaequipes Stimpson, 1858 and found to be new to Korean waters. The species was briefly illustrated and described.

Background: Thoracotremata belong to the large group of "true" crabs (infraorder Brachyura), and they exhibit a wide range of physiological and morphological adaptations to living in terrestrial, freshwater and marine habitats. Moreover, the clade comprises

Two forms of Macrophthalmus japonicus De Haan, Forms V and L (Wada, 1978), have been studied on their geographical distributions and geographical variations in their morphological and behavioral characters. Form V occurred along the coast of Honshu, Shikoku,