planiceps, Arius Steindachner [F.] 1876:576 [26], Pl. 4 [Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 72 (1. Abth.); ref. 18772] Altata, (Pacific) Panama. Syntypes: (several) NMW 48194-99 (1, 1, 1, 1, 1, 2); ZMUC P 29627 [ex 839] (1). Type catalog: Nielsen 1974:50 [ref. 9588], Ferraris 2007:50 [ref. 29155]. On p. 26 of separate. •Valid as Arius planiceps Steindachner 1876 -- (Burgess 1989:169 [ref. 12860], Allen & Robertson 1994:68 [ref. 22193], Bussing & López S. 1994:62 [ref. 23101], Kailola & Bussing in Fischer et al. 1995:872 [ref. 22829], De La Cruz Agüero et al. 1997:56 [ref. 24545], Acero P. & Betancur-R. 2002:134 [ref. 26190]). •Valid as Ariopsis planiceps (Steindachner 1877) -- (Castro-Aguirre et al. 1999:152 [ref. 24550], Nelson et al. 2004:83 [ref. 27807], Love et al. 2005:27 [ref. 37547]). •Valid as Aspistor planiceps (Steindachner 1876) -- (Kailola 2004:128 [ref. 28108]). •Valid as Notarius planiceps (Steindachner 1877) -- (Marceniuk & Ferraris in Reis et al. 2003:452 [ref. 27061], Betancur-R. & Acero P. 2004:18 [ref. 28008], Betancur-R. & Acero P. 2006:55 [ref. 28736], Ferraris 2007:50 [ref. 29155], Betancur-R. et al. 2007:349 [ref. 29268], Marceniuk et al. 2012:667 [ref. 32225], Page et al. 2013:82 [ref. 32708], Jiménez-Prado et al. 2015:400 [ref. 34894], Marceniuk et al. 2017:276 [ref. 35197], Love et al. 2021:45 [ref. 39279], Angulo et al. 2023:30 [ref. 40676], Barrientos et al. 2023:272 [ref. 41235], Marceniuk et al. 2023:15 [ref. 40422], Page et al. 2023:78 [ref. 40505]). Current status: Valid as Notarius planiceps (Steindachner 1876). Ariidae: Ariinae. Distribution: Eastern Pacific: Pacific coast of Baja California Sur (Mexico) south to Panama. Habitat: brackish, marine.