dimidiatus, Julis Agassiz [L.] in Spix & Agassiz 1831:96, Pl. 53 [Selecta genera et species piscium quos in itinere per Brasiliam; ref. 13] Atlantic off Brazil. Syntypes: MHNN 563 (1). Type catalog: Kottelat 1984:150 [ref. 21784]. •Synonym of Halichoeres cyanocephalus (Bloch 1791) -- (Parenti & Randall 2000:20 [ref. 24943]). •Valid as Iridio dimidiatus (Agassiz 1831) -- (Kuiter 2010:213 [ref. 35285]). •Valid as Halichoeres dimidiatus (Agassiz 1831) -- (Rocha 2004:777 [ref. 27980], Barneche et al. 2009:2 [ref. 41393], Luiz et al. 2009:37 [ref. 30311], Rocha et al. 2010:28 [ref. 30767], Parenti & Randall 2011:34 [ref. 31299], Pinheiro et al. 2015:25 [ref. 34324], Wainwright et al. 2017:37 [ref. 35725], Carvalho-Filho et al. in Marceniuk et al. 2021:462 [ref. 38945], Carvalho-Filho 2023:209 [ref. 40480], Hoff et al. 2023:7 [ref. 40463]). Current status: Valid as Halichoeres dimidiatus (Agassiz 1831). Labridae. Distribution: Western Atlantic: French Guiana south to São Paulo (Brazil). IUCN (2010): Least Concern. Habitat: marine.