grisea, Muraenophis Lacepède [B. G. E.] (ex Commerson) 1803:629, 642, Pl. 19 (fig. 3) [Histoire naturelle des poissons (Lacepède) v. 5; ref. 4930] No locality stated [New Ireland, Papua New Guinea (not Madagascar)]. No types known. Type catalog: Bauchot et al. 1993:126 [ref. 20810], Böhlke & Smith 2002:114 [ref. 26380]. Neotype designation by Fricke 1999:57 [ref. 24106] is invalid; see Fricke 2000:639 [ref. 24537]. Based on description and drawing in manuscript by Commerson (Philibert Commerson, 1727-1773, French explorer and naturalist). Type locality incorrectly assumed to be Madagascar, but according to the Commerson manuscript it is New Ireland, Papua New Guinea (R. Fricke, pers. comm., 2026). •Valid as Siderea grisea (Lacepède 1803) -- (Dor 1984:29 [ref. 29757], Castle & McCosker 1986:174 [ref. 5645], Goren & Dor 1994:7 [ref. 25356], Quéro & Saldanha 1995:68 [ref. 22017], Randall & Golani 1995:870 [ref. 21744], Randall 1995:58 [ref. 22896], Fricke 1999:56 [ref. 24106], Caratini & Soriano 2011:60 [ref. 39915]). •Valid as Gymnothorax griseus (Lacepède 1803) -- (Winterbottom et al. 1989:9 [ref. 13251], Böhlke & Randall 1999:551 [ref. 24552], Böhlke & Smith 2002:114 [ref. 26380], Manilo & Bogorodsky 2003:S95 [ref. 27377], Heemstra et al. 2004:3316 [ref. 27945], Heemstra & Heemstra 2004:104 [ref. 28072], Fricke et al. 2009:16 [ref. 30213], Smith 2012:16 [ref. 32155], Fricke et al. 2013:251 [ref. 32706], Fricke et al. 2018:36 [ref. 35805], Golani & Fricke 2018:21 [ref. 36273], Arndt & Fricke 2019:23 [ref. 36883], Dalleau-Coudert et al. 2019:112 [ref. 40104], Zajonz et al. 2019:62 [ref. 36871], Smith et al. 2019:29 [ref. 37159], Eudeline 2022:139 [ref. 39191], Smith & Böhlke 2022:53 [ref. 39681], Fricke et al. 2024:80 [ref. 41255], Chaikin & Belmaker 2026:38 [ref. 42733]). •Synonym of Gymnothorax thyrsoideus (Richardson 1845) -- (Golani & Fricke 2026:22 [ref. 42831]). Current status: Synonym of Gymnothorax thyrsoideus (Richardson 1845). Muraenidae: Muraeninae. Habitat: marine.