tristis, Hippocampus Castelnau [F. L.] 1872:197 [Proceedings of the Zoological and Acclimatisation Society of Victoria, Melbourne v. 1; ref. 757] Melbourne market, Victoria, Australia. Holotype (unique): MNHN A.4537. Non-type material: MNHN 4538 (1). Type catalog: Bertin & Estève 1950:53 [ref. 19576], Kuiter 2020:42 [ref. 37609]. •Probably a synonym of Hippocampus whitei Bleeker 1855 -- (Paxton et al. 1989:42 [ref. 12442], Gomon et al. 1994:449 [ref. 22532]). •Synonym of Hippocampus kuda Bleeker 1852 -- (Lourie et al. 1999:109 [ref. 23993], Lourie et al. 2016:31 [ref. 34632]). •Valid as Hippocampus tristis Castelnau 1872 -- (Kuiter 2001:316 [ref. 25900], Paxton et al. 2006:829 [ref. 29073], Kuiter 2009:107 [ref. 30404], Kuiter 2020:42 [ref. 37609]). Current status: Synonym of Hippocampus kuda Bleeker 1852. Syngnathidae: Syngnathinae. Distribution: Southeastern Indian Ocean: South Australia and Victoria (Australia). Habitat: marine.