opisthoproctus, Dysomma Chen [Y.-Y.] & Mok [H.-K.] 1995:927, Fig. 1 [Copeia 1995 (no. 4); ref. 21892] Off the coast of Nan-fang-ao [Nanfangao], 24°51'24"N, 121°58'30"E, northeastern coast of Taiwan, depth 200 meters. Holotype (unique): NSYSU 2701, whereabouts unknown. Type catalog: Ho & Shao 2011:22 [ref. 31432]. •Valid as Dysomma opisthoproctus Chen & Mok 1995 -- (Chen & Mok 1999:60 [ref. 24093], Smith 1999:1661 [ref. 24661], Lee & Kim 2000:205 [ref. 25177], Chen & Mok 2001:79 [ref. 25465], Ho & Shao 2011:22 [ref. 31432], Ho et al. 2015:98 [ref. 34124], Ho et al. 2015:8 [ref. 34116], Ho et al. 2015:178 [ref. 34130], Fricke et al. 2018:6 [ref. 35780], Ho & Tighe 2018:53 [ref. 36037], Prokofiev 2019:321 [ref. 36804]). Current status: Valid as Dysomma opisthoproctus Chen & Mok 1995. Synaphobranchidae: Ilyophinae. Distribution: Western Pacific: Taiwan. Habitat: marine.