Two new records of the Varunidae, Ptychognathus altimanus (Rathbun, 1914) and Utica gracilipes White, 1847, are reported from southern Taiwan. The present study lists the diagnostic morphological features of P. altimanus and U. gracilipes, and provides

Species in the brackish crab genus Ptychognathus are common in the seashore and estuary habitats with freshwater input. Due to their similar morphologies and dull colorations, it is always difficult to distinguish the species in this genus. In this study,

Ptychognathus makii (Varunidae) is reported based on the specimens collected from the south coast of Kyushu and Okinawa Island, southern Japan. This species was considered "P. affinis" in previous Japanese literature. However, the specimens in this study