Genus Uroptychus Henderson, 1888

Remarks. Uroptychus is the largest genus in the Chirostyloidea, with more than 250 described species, 100 of these recently described from the Indo-West Pacific by Baba (2018). Just after Baba (2018), Schnabel (2020) described 24 new species from waters around New Zealand, citing a personal communication with Dr. K. Baba that many more undescribed species await description in natural history collections around the world. From waters around Japan, 26 species have been recorded (Baba et al. 2008; Baba 2018). In this study, one new species is described from the West Mariana Ridge.