castanea, Sidera Jordan [D. S.] & Gilbert [C. H.] 1883:647 [Proceedings of the United States National Museum v. 5 (no. 335) (for 26 June 1883); ref. 10617] Mazatlán, Sinaloa, western Mexico. Lectotype: USNM 29591. Paralectotypes: USNM 28246 (1, lost), 29535 (1). Type catalog: Smith 1994:24 [ref. 21917], Böhlke & Smith 2002:100 [ref. 26380]. Lectotype selected by Smith 1994:24 [ref. 21917]. •Valid as Gymnothorax castaneus (Jordan & Gilbert 1883) -- (Allen & Robertson 1994:45 [ref. 22193], McCosker & Rosenblatt in Fischer et al. 1995:1309 [ref. 22830], De La Cruz Agüero et al. 1997:225 [ref. 24545], Grove & Lavenberg 1997:150 [ref. 24023], Bussing 1998:444 [ref. 24930], Thomson et al. 2000:43 [ref. 25640], Böhlke & Smith 2002:100 [ref. 26380], Nelson et al. 2004:60 [ref. 27807], Love et al. 2005:18 [ref. 37547], McCosker & Rosenblatt 2010:188 [ref. 30957], Smith 2012:13 [ref. 32155], Page et al. 2013:61 [ref. 32708], Galván-Villa et al. 2016:144 [ref. 34871], Fourriére et al. 2016:441 [ref. 34668], Del Moral-Flores et al. 2016:606 [ref. 34923], Dale et al. 2021:313 [ref. 38298], Love et al. 2021:33 [ref. 39279], Grove et al. 2022:15 [ref. 41326], Page et al. 2023:51 [ref. 40505], Vela-Espinosa et al. 2023:6 [ref. 40981], Fricke et al. 2024:114 [ref. 41622]). Current status: Valid as Gymnothorax castaneus (Jordan & Gilbert 1883). Muraenidae: Muraeninae. Distribution: Eastern Pacific: Pacific coast of Baja California (Mexico) south to Ecuador, including Gulf of California (Mexico) and Galapagos Islands (Ecuador). IUCN (2010): Least Concern. Habitat: marine.