Genus Gonionida Macpherson & Baba in Machordom, Ahyong, Andreakis, Baba, Buckley, Garcia-Jimenez, McCallum, Rodriguez-Flores & Macpherson, 2022

Remarks. Gonionida is heretofore represented by 62 species (Machordom et al. 2022; WoRMS 2023a), all of which occur in the Indo-West Pacific. From Japanese waters, the following five species of the genus have been recorded (Baba et al. 2008; Komai 2012, 2017; Komai & Higashiji 2016): G. andamanica (Alcock, 1894), G. kuboi (Yanagita, 1943), G. michaeli (Komai, 2017), G. pilorhyncha (Miyake & Baba, 1966), and G. pollioculus (Komai & Higashiji, 2016) . In this study, one new species, G. kaimei, is described based on a single specimen from Shoho Seamount, Nishi-Shichito Ridge.