ypsilon, Gymnothorax Hatooka [K.] & Randall [J. E.] 1992:183, Figs. 1-2 [Japanese Journal of Ichthyology v. 39 (no. 3); ref. 20258] Near Uotsurijima Island, Senkaku Islands, Japan. Holotype: URM-P 1783. Paratypes: BPBM 9643 (4); FAKU 51430 (1, dissected), 51604 (1), 100530 (1); SMBL 73341 [not seen at FAKU] (1); ZUMT 55591 (1), 55594 (1). Type catalog: Böhlke & Smith 2002:156 [ref. 26380], Aizawa et al. 2022:143 [ref. 39647]. •Synonym of Gymnothorax richardsoni (Bleeker 1852) -- (Zhang et al. 2010:275 [ref. 31511]). •Valid as Gymnothorax ypsilon Hatooka & Randall 1992 -- (Böhlke & Randall 2000:260 [ref. 24493], Nakabo 2000:204 [ref. 25086], Nakabo 2002:204 [ref. 26001], Böhlke & Smith 2002:156 [ref. 26380], Mundy & Parrish 2004:412 [ref. 27877], Shinohara et al. 2005:399 [ref. 28370], Mundy 2005:125 [ref. 28379], McCosker & Stewart 2006:87 [ref. 28702], Randall 2007:94 [ref. 30952], Smith 2012:29 [ref. 32155], Duffy & Ahyong 2015:108 [ref. 36167], Ho et al. 2015:162 [ref. 34130], Stewart & McCosker 2015:237 [ref. 34233], Ramos-Castro et al. 2020:83 [ref. 37651], Koeda et al. 2021:5 [ref. 38857], Smith & Böhlke 2022:66 [ref. 39681]). Current status: Valid as Gymnothorax ypsilon Hatooka & Randall 1992. Muraenidae: Muraeninae. Distribution: Indo-Pacific: Mascarene Ridge; Taiwan, Ryukyu Islands, southern Japan and Ogasawara Islands; Hawaiian Islands and New Zealand EEZ, Kermadec Islands. Habitat: marine.