opercularis, Callionymus Valenciennes [A.] in Cuvier & Valenciennes 1837:305 [Histoire naturelle des poissons v. 12; ref. 1006] Mouth of Arian-Coupan River at Puducherry, India. Holotype (unique): MNHN A-1514. Type catalog: Fricke 1982:73 [ref. 5432], Fricke et al. 1984:106 [ref. 21539]. •Valid as Eleutherochir opercularis (Valenciennes 1837) -- (Fricke 1982:73 [ref. 5432], Fricke 1983:546 [ref. 8349], Nakabo in Masuda et al. 1984:345 [ref. 6441], Talwar & Jhingran 1991:917 [ref. 20764], Kottelat et al. 1993:131 [ref. 23448], Fricke in Randall & Lim 2000:634 [ref. 25122], Nakabo 2000:1126 [ref. 25182], Matsuura & Peristiwady in Matsuura & Peristiwady 2000:286 [ref. 27511], Fricke 2001:3560 [ref. 26292], Nakabo 2002:1126 [ref. 26193], Fricke 2002:50 [ref. 26547], Allen & Adrim 2003:56 [ref. 26830], Shao et al. 2008:260 [ref. 29952], Kottelat 2013:385 [ref. 32989], Fricke et al. 2014:154 [ref. 33932], Fricke 2016:49 [ref. 34468], Miesen et al. 2016:91 [ref. 34492], Fricke 2016:20 [ref. 34659], Fricke 2017:183 [ref. 35548], Roy et al. 2021:215 [ref. 38220], Jamandre 2023:162 [ref. 40455]). Current status: Valid as Eleutherochir opercularis (Valenciennes 1837). Callionymidae. Distribution: Eastern Indian Ocean, western Pacific: Sri Lanka and eastern India east to Philippines and New Guinea, north to Ryukyu Islands. Habitat: brackish, marine.