antiquorum, Hippocampus Leach [W. E.] in Leach & Nodder 1814:104 [Zoological miscellany; being descriptions of new, or interesting animals v. 1-3; ref. 2738] Mediterranean Sea. No types known. Appeared as Hippocampus antiquus in Risso 1827:183 [ref. 3757]. •Synonym of Hippocampus hippocampus (Linnaeus 1758) -- (Wheeler 1973:278 [ref. 7190], Dawson 1990:660 [ref. 17542], Lourie et al. 1999:99 [ref. 23993], Kuiter 2009:58 [ref. 30404], Lourie et al. 2016:27 [ref. 34632]). Current status: Synonym of Hippocampus hippocampus (Linnaeus 1758). Syngnathidae: Syngnathinae. Habitat: brackish, marine.