Thyrsoidea Kaup [J. J.] 1856:60 Fem. Muraena thyrsoidea Richardson 1845. Type by absolute tautonymy of an included synonym. Muraena thyrsoidea Richardson needlessly renamed Thyrsoidea arenata by Kaup. Also in Kaup 1857:74 [ref. 2573] and as name only in Kaup in Duméril 1856:200 [ref. 1154]. •Valid as Thyrsoides Kaup 1856 [but with different type] (Castle & McCosker 1986:174 [ref. 5645], Ajiad 1987 [ref. 6752] and Paxton et al. 1989:133 [ref. 12442] with type as T. longissima Kaup 1856, Böhlke et al. 1989:130 [ref. 13286]). •Valid as Thyrsoidea Kaup 1856 -- (Böhlke 1995:462 [ref. 21738]). •Synonym of Gymnothorax Bloch 1795 -- (Böhlke & Randall 2000:226 [ref. 24493], Smith 2012:10 [ref. 32155], Kottelat 2013:41 [ref. 32989]). Current status: Synonym of Gymnothorax Bloch 1795. Muraenidae: Muraeninae.