• Hippocampus Rafinesque, 1810
• Hippocampus Rafinesque, 1810
• Hippocampus abdominalis Lesson, 1827
• Hippocampus agnesae Fowler, 1907 accepted as Hippocampus abdominalis Lesson, 1827
• Hippocampus aimei Roule, 1916 accepted as Hippocampus spinosissimus Weber, 1913
• Hippocampus aimei Roule, 1916 accepted as Hippocampus barbouri Jordan & Richardson, 1908
• Hippocampus alatus Kuiter, 2001
• Hippocampus algiricus Kaup, 1856
• Hippocampus angustus Günther, 1870
• Hippocampus antiquorum Leach, 1814 accepted as Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus antiquus Risso, 1827 accepted as Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus arnei Roule, 1916 accepted as Hippocampus spinosissimus Weber, 1913
• Hippocampus arnei Roule, 1916 accepted as Hippocampus barbouri Jordan & Richardson, 1908
• Hippocampus aterrimus Jordan & Snyder, 1902 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus barbouri Jordan & Richardson, 1908
• Hippocampus bargibanti Whitley, 1970
• Hippocampus bicuspis Kaup, 1856 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus biocellatus Kuiter, 2001 accepted as Hippocampus planifrons Peters, 1877
• Hippocampus bleekeri Fowler, 1907 accepted as Hippocampus abdominalis Lesson, 1827
• Hippocampus borboniensis Duméril, 1870
• Hippocampus brachyrhynchus Duncker, 1914 accepted as Hippocampus fuscus Rüppell, 1838
• Hippocampus breviceps Peters, 1869
• Hippocampus brevirostris Schinz, 1822 accepted as Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus brunneus Bean, 1906 accepted as Hippocampus erectus Perry, 1810
• Hippocampus cameleopardalis Bianconi, 1854 accepted as Hippocampus camelopardalis Bianconi, 1854
• Hippocampus cameleopardalus Bianconi, 1854 accepted as Hippocampus camelopardalis Bianconi, 1854
• Hippocampus camelopardalis Bianconi, 1854
• Hippocampus capensis Boulenger, 1900
• Hippocampus casscsio Zhang, Qin, Wang & Lin, 2016
• Hippocampus chinensis Basilewsky, 1855 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus colemani Kuiter, 2003
• Hippocampus comes Cantor, 1849
• Hippocampus coronatus Temminck & Schlegel, 1850
• Hippocampus curvicuspis Fricke, 2004
• Hippocampus dahli Ogilby, 1908 accepted as Hippocampus trimaculatus Leach, 1814
• Hippocampus deanei Duméril, 1861 accepted as Hippocampus algiricus Kaup, 1856
• Hippocampus debelius Gomon & Kuiter, 2009
• Hippocampus denise Lourie & Randall, 2003
• Hippocampus ecuadorensis Fowler, 1922 accepted as Hippocampus ingens Girard, 1858
• Hippocampus elongatus Castelnau, 1873 accepted as Hippocampus subelongatus Castelnau, 1873
• Hippocampus erectus Perry, 1810
• Hippocampus erinaceus Günther, 1870 accepted as Hippocampus angustus Günther, 1870
• Hippocampus europaeus Ginsburg, 1933 accepted as Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus fascicularis Kaup, 1856 accepted as Hippocampus erectus Perry, 1810
• Hippocampus filamentosus Duméril, 1870 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus fisheri Jordan & Evermann, 1903
• Hippocampus fuscus Rüppell, 1838
• Hippocampus graciliformis McCulloch, 1911 accepted as Hippocampus abdominalis Lesson, 1827
• Hippocampus gracilis Gill, 1862 accepted as Hippocampus ingens Girard, 1858
• Hippocampus gracilissimus Temminck & Schlegel, 1850 accepted as Acentronura gracilissima (Temminck & Schlegel, 1850)
• Hippocampus grandiceps Kuiter, 2001
• Hippocampus guttulatus Cuvier, 1829
• Hippocampus guttulatus microstephanus Slastenenko, 1937
• Hippocampus guttulatus multiannularis Ginsburg, 1937 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus haema Han, Kim, Kai & Senou, 2017
• Hippocampus hendriki Kuiter, 2001
• Hippocampus heptagonus Rafinesque, 1810 accepted as Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus hildebrandi Ginsburg, 1933 accepted as Hippocampus ingens Girard, 1858
• Hippocampus hilonis Jordan & Evermann, 1903 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus hippocampus (Linnaeus, 1758)
• Hippocampus hippocampus microcoronatus Slastenenko, 1938 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus hippocampus microstephanus Slastenenko, 1937 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus histrix Kaup, 1856
• Hippocampus horai Duncker, 1926 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus hudsonius DeKay, 1842 accepted as Hippocampus erectus Perry, 1810
• Hippocampus hystrix Kaup, 1856 accepted as Hippocampus histrix Kaup, 1856
• Hippocampus ingens Girard, 1858
• Hippocampus japapigu Short, Smith, Motomura, Harasti & Hamilton, 2018
• Hippocampus japonicus Kaup, 1856 accepted as Hippocampus mohnikei Bleeker, 1853
• Hippocampus jayakari Boulenger, 1900
• Hippocampus jugumus Kuiter, 2001
• Hippocampus kampylotrachelos Bleeker, 1854 accepted as Hippocampus trimaculatus Leach, 1814
• Hippocampus kaupii Duméril, 1870 accepted as Hippocampus algiricus Kaup, 1856
• Hippocampus kelloggi Jordan & Snyder, 1901
• Hippocampus kincaidi Townsend & Barbour, 1906 accepted as Hippocampus erectus Perry, 1810
• Hippocampus kuda Bleeker, 1852
• Hippocampus kuda multiannularis Raj, 1941 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus laevicaudatus Kaup, 1856 accepted as Hippocampus erectus Perry, 1810
• Hippocampus lenis De Vis, 1908 accepted as Hippocampus trimaculatus Leach, 1814
• Hippocampus lichtensteinii Kaup, 1856
• Hippocampus longirostris Schinz, 1822 accepted as Hippocampus guttulatus Cuvier, 1829
• Hippocampus manadensis Bleeker, 1856 accepted as Hippocampus trimaculatus Leach, 1814
• Hippocampus mannulus Cantor, 1849 accepted as Hippocampus trimaculatus Leach, 1814
• Hippocampus marginalis Kaup, 1856 accepted as Hippocampus erectus Perry, 1810
• Hippocampus melanospilos Bleeker, 1854 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus minotaur Gomon, 1997
• Hippocampus mohnikei Bleeker, 1853
• Hippocampus moluccensis Bleeker, 1852 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus monckei Bleeker, 1853 accepted as Hippocampus mohnikei Bleeker, 1853
• Hippocampus monickei Bleeker, 1853 accepted as Hippocampus mohnikei Bleeker, 1853
• Hippocampus monikei Bleeker, 1853 accepted as Hippocampus mohnikei Bleeker, 1853
• Hippocampus montebelloensis Kuiter, 2001
• Hippocampus multispinus Kuiter, 2001
• Hippocampus nalu Short, Claassens, Smith, De Brauwer, Hamilton, Stat & Harasti, 2020
• Hippocampus natalensis von Bonde, 1923 accepted as Hippocampus fuscus Rüppell, 1838
• Hippocampus novaehebudorum Fowler, 1944 accepted as Hippocampus kuda Bleeker, 1852
• Hippocampus novaehollandae Steindachner, 1866 accepted as Hippocampus whitei Bleeker, 1855
• Hippocampus novaehollandiae Steindachner, 1866 accepted as Hippocampus whitei Bleeker, 1855
• Hippocampus obscurus Ehrenberg, 1871 accepted as Hippocampus fuscus Rüppell, 1838
• Hippocampus obscurus Hemprich & Ehrenberg, 1856 accepted as Hippocampus fuscus Rüppell, 1838