caerulescens, Arius Günther [A.] 1864:149, Fig. [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Huamuchal, Guatemala. Syntypes: BMNH 1864.1.26.208-209 (2). Type catalog: Ferraris 2007:33 [ref. 29155]. •Valid as Arius caerulescens Günther 1864 -- (Burgess 1989:168 [ref. 12860]). •Synonym of Arius guatemalensis Günther 1864 -- (Kailola & Bussing in Fischer et al. 1995:868 [ref. 22829]). •Synonym of Hexanematichthys guatemalensis (Günther 1864) -- (Marceniuk & Ferraris in Reis et al. 2003:451 [ref. 27061]). •Synonym of Sciades guatemalensis (Günther 1864) -- (Marceniuk & Menezes 2007:107 [ref. 29031]). •Synonym of Ariopsis guatemalensis (Günther 1864) -- (Castro-Aguirre et al. 1999:154 [ref. 24550], Kailola 2004:126 [ref. 28108], Ferraris 2007:33 [ref. 29155], Marceniuk et al. 2017:22 [ref. 35431]). Current status: Synonym of Ariopsis guatemalensis (Günther 1864). Ariidae: Ariinae. Habitat: marine.