arenatus, Arius Valenciennes [A.] in Cuvier & Valenciennes 1840:106 [Histoire naturelle des poissons v. 15; ref. 1008] Suriname. Holotype (unique): RMNH 3099 (stuffed). Type information: Boeseman 1972:299 [ref. 19698]. Type catalog: Ferraris 2007:39 [ref. 29155]. For locality information see Boeseman 1972:299 [ref. 19698]. •Valid as Arius arenatus Valenciennes 1840 -- (Burgess 1989:168 [ref. 12860]). •Valid as Cathorops arenatus (Valenciennes 1840) -- (Camargo & Isaac 2001:145 [ref. 27639], Acero P. 2003:837 [ref. 26998], Marceniuk & Ferraris in Reis et al. 2003:449 [ref. 27061], Kailola 2004:132 [ref. 28108], Betancur-R. & Acero P. 2005:54 [ref. 28341], Marceniuk 2005:97 [ref. 28718], Marceniuk & Menezes 2007:43 [ref. 29031], Ferraris 2007:39 [ref. 29155], Betancur-R. et al. 2007:349 [ref. 29268], Marceniuk 2007:363 [ref. 29509], Marceniuk & Betancur-R. 2008:42 [ref. 29576], Marceniuk et al. 2009:248 [ref. 30406], Marceniuk et al. 2012:91 [ref. 31865], Marceniuk et al. 2016:138 [ref. 34763], Marceniuk et al. 2017:38 [ref. 35324], Costa et al. 2017:45 [ref. 35684], Marceniuk in Marceniuk et al. 2021:167 [ref. 38945], Carvalho-Filho 2023:73 [ref. 40480], Marceniuk et al. 2023:13 [ref. 40422]). Current status: Valid as Cathorops arenatus (Valenciennes 1840). Ariidae: Ariinae. Distribution: Southwestern Atlantic: Atlantic coastal rivers from Guyana to northeastern Brazil: Brazil, French Guiana, Guyana and Suriname. Habitat: brackish, marine.