aequoreus, Syngnathus Linnaeus [C.] 1758:337 [Systema Naturae, Ed. X v. 1; ref. 2787] Open sea. No types known. Neotype designated by Fricke 1999:37 [ref. 24101], but withdrawn in Fricke 2000:639 [ref. 24537]. •Valid as Syngnathus aequoreus Linnaeus 1758 -- (Herrera 1896:36 [ref. 39336]). •Valid as Entelurus aequoreus (Linnaeus 1758) -- (Wheeler 1973:278 [ref. 7190], Dawson 1978:419 [ref. 8724], Dawson in Whitehead et al. 1986:629 [ref. 13676], Santos et al. 1997:73 [ref. 23531], Arruda 1997:64 [ref. 24952], Fricke 1999:37 [ref. 24101], Bilecenoğlu et al. 2002:176 [ref. 26753], Fricke 2007:28 [ref. 30577], Kuiter 2009:258 [ref. 30404], Møller et al. 2010:69 [ref. 31169], Mecklenburg et al. 2011:121 [ref. 31212], Parin et al. 2014:207 [ref. 33547], Bañón et al. 2016:321 [ref. 34397], Hamilton et al. 2016:Supplement 4 [ref. 35615], Mecklenburg et al. 2018:172 [ref. 36370], Carneiro et al. 2019:175 [ref. 37250], Bañón & Maño 2021:66 [ref. 38883], Kovačić et al. 2021:37 [ref. 39014]). Current status: Valid as Entelurus aequoreus (Linnaeus 1758). Syngnathidae: Nerophinae. Distribution: Eastern Atlantic and adjacent Arctic regions: Baltic Sea, North Sea, Barents and Greenland seas, south Greenland coast, northeastern Atlantic. Habitat: brackish, marine.