n = 134
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Hippocampus abdominalis | Lesson, 1827 | Hippocampus abdominalis | Syngnathidae | Big-belly seahorse |
| Hippocampus agnesae | Fowler, 1907 | Hippocampus abdominalis | Syngnathidae | Big-belly seahorse |
| Hippocampus alatus | Kuiter, 2001 | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus algiricus | Kaup, 1856 | Hippocampus algiricus | Syngnathidae | West African seahorse |
| Hippocampus angustus | Günther, 1870 | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus antiquorum | Leach, 1814 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus antiquus | Risso, 1827 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus aterrimus | Jordan & Snyder, 1902 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus barbouri | Jordan & Richardson, 1908 | Hippocampus barbouri | Syngnathidae | Barbour's seahorse |
| Hippocampus bargibanti | Whitley, 1970 | Hippocampus bargibanti | Syngnathidae | Pygmy seahorse |
| Hippocampus biocellatus | Kuiter, 2001 | Hippocampus planifrons | Syngnathidae | Flatface seahorse |
| Hippocampus bleekeri | Fowler, 1907 | Hippocampus abdominalis | Syngnathidae | Big-belly seahorse |
| Hippocampus borboniensis | Duméril, 1870 | Hippocampus borboniensis | Syngnathidae | Réunion seahorse |
| Hippocampus brachyrhynchus | Duncker, 1914 | Hippocampus fuscus | Syngnathidae | Sea pony |
| Hippocampus breviceps | Peters, 1869 | Hippocampus breviceps | Syngnathidae | Shorthead seahorse |
| Hippocampus brevirostris | Schinz, 1822 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus brunneus | Bean, 1906 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus cameleopardalis | Bianconi, 1854 | Hippocampus camelopardalis | Syngnathidae | Giraffe seahorse |
| Hippocampus cameleopardalus | Bianconi, 1854 | Hippocampus camelopardalis | Syngnathidae | Giraffe seahorse |
| Hippocampus camelopardalis | Bianconi, 1854 | Hippocampus camelopardalis | Syngnathidae | Giraffe seahorse |
| Hippocampus capensis | Boulenger, 1900 | Hippocampus capensis | Syngnathidae | Knysna seahorse |
| Hippocampus casscsio | Zhang, Qin, Wang & Lin, 2016 | Hippocampus casscsio | Syngnathidae | Beibu Bay seahorse |
| Hippocampus chinensis | Basilewsky, 1855 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus colemani | Kuiter, 2003 | Hippocampus colemani | Syngnathidae | Coleman's pygmy seahorse |
| Hippocampus comes | Cantor, 1849 | Hippocampus comes | Syngnathidae | Tiger tail seahorse |
| Hippocampus coronatus | Temminck & Schlegel, 1850 | Hippocampus coronatus | Syngnathidae | Crowned seahorse |
| Hippocampus curvicuspis | Fricke, 2004 | Hippocampus curvicuspis | Syngnathidae | New Caledonian thorny seahorse |
| Hippocampus dahli | Ogilby, 1908 | Hippocampus dahli | Syngnathidae | Lowcrown seahorse |
| Hippocampus deanei | Duméril, 1861 | Hippocampus algiricus | Syngnathidae | West African seahorse |
| Hippocampus debelius | Gomon & Kuiter, 2009 | Hippocampus debelius | Syngnathidae | Softcoral seahorse |
| Hippocampus denise | Lourie & Randall, 2003 | Hippocampus denise | Syngnathidae | Denise's pygmy seahorse |
| Hippocampus ecuadorensis | Fowler, 1922 | Hippocampus ingens | Syngnathidae | Pacific seahorse |
| Hippocampus elongatus | Castelnau, 1873 | Hippocampus subelongatus | Syngnathidae | West Australian seahorse |
| Hippocampus erectus | Perry, 1810 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus erinaceus | Günther, 1870 | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus europaeus | Ginsburg, 1933 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus fascicularis | Kaup, 1856 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus fisheri | Jordan & Evermann, 1903 | Hippocampus fisheri | Syngnathidae | Fisher's seahorse |
| Hippocampus fuscus | Rüppell, 1838 | Hippocampus fuscus | Syngnathidae | Sea pony |
| Hippocampus graciliformis | McCulloch, 1911 | Hippocampus abdominalis | Syngnathidae | Big-belly seahorse |
| Hippocampus gracilis | Gill, 1862 | Hippocampus ingens | Syngnathidae | Pacific seahorse |
| Hippocampus gracilissimus | Temminck & Schlegel, 1850 | Acentronura gracilissima | Syngnathidae | Bastard seahorse |
| Hippocampus grandiceps | Kuiter, 2001 | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus guttulatus | Cuvier, 1829 | Hippocampus guttulatus | Syngnathidae | Long-snouted seahorse |
| Hippocampus guttulatus multiannularis | Ginsburg, 1937 | Hippocampus guttulatus | Syngnathidae | Long-snouted seahorse |
| Hippocampus haema | Han, Kim, Kai & Senou, 2017 | Hippocampus haema | Syngnathidae | Korean seahorse |
| Hippocampus hendriki | Kuiter, 2001 | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus heptagonus | Rafinesque, 1810 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus hildebrandi | Ginsburg, 1933 | Hippocampus ingens | Syngnathidae | Pacific seahorse |
| Hippocampus hilonis | Jordan & Evermann, 1903 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus hippocampus | (Linnaeus, 1758) | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus hippocampus microcoronatus | Slastenenko, 1938 | Hippocampus guttulatus | Syngnathidae | Long-snouted seahorse |
| Hippocampus hippocampus microstephanus | Slastenenko, 1937 | Hippocampus guttulatus | Syngnathidae | Long-snouted seahorse |
| Hippocampus histrix | Kaup, 1856 | Hippocampus histrix | Syngnathidae | Thorny seahorse |
| Hippocampus horai | Duncker, 1926 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus hudsonius | DeKay, 1842 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus hystrix | Kaup, 1856 | Hippocampus histrix | Syngnathidae | Thorny seahorse |
| Hippocampus ingens | Girard, 1858 | Hippocampus ingens | Syngnathidae | Pacific seahorse |
| Hippocampus japapigu | Short, Smith, Motomura, Harasti & Hamilton, 2018 | Hippocampus japapigu | Syngnathidae | Japanese pygmy seahorse |
| Hippocampus japonicus | Kaup, 1856 | Hippocampus mohnikei | Syngnathidae | Japanese seahorse |
| Hippocampus jayakari | Boulenger, 1900 | Hippocampus jayakari | Syngnathidae | Jayakar's seahorse |
| Hippocampus jugumus | Kuiter, 2001 | Hippocampus jugumus | Syngnathidae | Collared seahorse |
| Hippocampus kampylotrachelos | Bleeker, 1854 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus kaupii | Duméril, 1870 | Hippocampus algiricus | Syngnathidae | West African seahorse |
| Hippocampus kelloggi | Jordan & Snyder, 1901 | Hippocampus kelloggi | Syngnathidae | Great seahorse |
| Hippocampus kincaidi | Townsend & Barbour, 1906 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus kuda | Bleeker, 1852 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus kuda multiannularis | Raj, 1941 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus laevicaudatus | Kaup, 1856 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus lenis | De Vis, 1908 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus lichtensteinii | Kaup, 1856 | Hippocampus lichtensteinii | Syngnathidae | Lichtenstein's Seahorse |
| Hippocampus longirostris | Schinz, 1822 | Hippocampus guttulatus | Syngnathidae | Long-snouted seahorse |
| Hippocampus manadensis | Bleeker, 1856 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus mannulus | Cantor, 1849 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus marginalis | Kaup, 1856 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus melanospilos | Bleeker, 1854 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus minotaur | Gomon, 1997 | Hippocampus minotaur | Syngnathidae | Bullneck seahorse |
| Hippocampus mohnikei | Bleeker, 1853 | Hippocampus mohnikei | Syngnathidae | Japanese seahorse |
| Hippocampus moluccensis | Bleeker, 1852 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus monckei | Bleeker, 1853 | Hippocampus mohnikei | Syngnathidae | Japanese seahorse |
| Hippocampus monickei | Bleeker, 1853 | Hippocampus mohnikei | Syngnathidae | Japanese seahorse |
| Hippocampus monikei | Bleeker, 1853 | Hippocampus mohnikei | Syngnathidae | Japanese seahorse |
| Hippocampus multispinus | Kuiter, 2001 | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus nalu | Short, Claassens, Smith, de Brauwer, Hamilton, Stat & Harasti, 2020 | Hippocampus nalu | Syngnathidae | Sodwana pygmy seahorse |
| Hippocampus natalensis | von Bonde, 1923 | Hippocampus fuscus | Syngnathidae | Sea pony |
| Hippocampus novaehebudorum | Fowler, 1944 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus novaehollandae | Steindachner, 1866 | Hippocampus whitei | Syngnathidae | White's seahorse |
| Hippocampus novaehollandiae | Steindachner, 1866 | Hippocampus whitei | Syngnathidae | White's seahorse |
| Hippocampus obscurus | Ehrenberg, 1871 | Hippocampus fuscus | Syngnathidae | Sea pony |
| Hippocampus obscurus | Hemprich & Ehrenberg, 1856 | Hippocampus fuscus | Syngnathidae | Sea pony |
| Hippocampus obtusus | Ginsburg, 1933 | Hippocampus reidi | Syngnathidae | Longsnout seahorse |
| Hippocampus paradoxus | Foster & Gomon, 2010 | Hippocampus paradoxus | Syngnathidae | Paradoxical seahorse |
| Hippocampus patagonicus | Piacentino & Luzzatto, 2004 | Hippocampus patagonicus | Syngnathidae | Patagonian seahorse |
| Hippocampus pentagonus | Rafinesque, 1810 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus planifrons | Peters, 1877 | Hippocampus planifrons | Syngnathidae | Flatface seahorse |
| Hippocampus poeyi | Howell Rivero, 1934 | Hippocampus reidi | Syngnathidae | Longsnout seahorse |
| Hippocampus polytaenia | Bleeker, 1854 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus pontohi | Lourie & Kuiter, 2008 | Hippocampus pontohi | Syngnathidae | Pontoh's pygmy seahorse |
| Hippocampus procerus | Kuiter, 2001 | Hippocampus whitei | Syngnathidae | White's seahorse |
| Hippocampus punctulatus | Guichenot, 1853 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus pusillus | Fricke, 2004 | Hippocampus pusillus | Syngnathidae | Pygmy thorny seahorse |
| Hippocampus queenslandicus | Horne, 2001 | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus regulus | Ginsburg, 1933 | Hippocampus zosterae | Syngnathidae | Dwarf seahorse |
| Hippocampus reidi | Ginsburg, 1933 | Hippocampus reidi | Syngnathidae | Longsnout seahorse |
| Hippocampus rhynchomacer | Duméril, 1870 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus rosamondae | Borodin, 1928 | Hippocampus zosterae | Syngnathidae | Dwarf seahorse |
| Hippocampus satomiae | Lourie & Kuiter, 2008 | Hippocampus satomiae | Syngnathidae | Satomi's pygmy seahorse |
| Hippocampus semispinosus | Kuiter, 2001 | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus severnsi | Lourie & Kuiter, 2008 | Hippocampus pontohi | Syngnathidae | Pontoh's pygmy seahorse |
| Hippocampus sindonis | Jordan & Snyder, 1901 | Hippocampus sindonis | Syngnathidae | Shiho's seahorse |
| Hippocampus sp. 1 | Not applicable | Hippocampus angustus | Syngnathidae | Western spiny seahorse |
| Hippocampus sp. 2 | Not applicable | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus sp. 3 | Not applicable | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus sp. 5 | Not applicable | Hippocampus planifrons | Syngnathidae | Flatface seahorse |
| Hippocampus sp. B | Not applicable | Hippocampus jugumus | Syngnathidae | Collared seahorse |
| Hippocampus species 4 | Not applicable | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus spinosissimus | Weber, 1913 | Hippocampus spinosissimus | Syngnathidae | Hedgehog seahorse |
| Hippocampus stylifer | Jordan & Gilbert, 1882 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus subcoronatus | Günther, 1866 | Hippocampus camelopardalis | Syngnathidae | Giraffe seahorse |
| Hippocampus subelongatus | Castelnau, 1873 | Hippocampus subelongatus | Syngnathidae | West Australian seahorse |
| Hippocampus suezensis | Duncker, 1940 | Hippocampus suezensis | Syngnathidae | Egyptian seahorse |
| Hippocampus taeniops | Fowler, 1904 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus taeniopterus | Bleeker, 1852 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus takakurae | Tanaka, 1916 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus trimaculatus | Leach, 1814 | Hippocampus trimaculatus | Syngnathidae | Longnose seahorse |
| Hippocampus tristis | Castelnau, 1872 | Hippocampus kuda | Syngnathidae | Spotted seahorse |
| Hippocampus tuberculatus | Castelnau, 1875 | Hippocampus breviceps | Syngnathidae | Shorthead seahorse |
| Hippocampus tyro | Randall & Lourie, 2009 | Hippocampus tyro | Syngnathidae | |
| Hippocampus villosus | Günther, 1880 | Hippocampus erectus | Syngnathidae | Lined seahorse |
| Hippocampus vulgaris | Cloquet, 1821 | Hippocampus hippocampus | Syngnathidae | Short snouted seahorse |
| Hippocampus waleananus | Gomon & Kuiter, 2009 | Hippocampus waleananus | Syngnathidae | Walea pygmy seahorse |
| Hippocampus whitei | Bleeker, 1855 | Hippocampus whitei | Syngnathidae | White's seahorse |
| Hippocampus zebra | Whitley, 1964 | Hippocampus zebra | Syngnathidae | Zebra seahorse |
| Hippocampus zosterae | Jordan & Gilbert, 1882 | Hippocampus zosterae | Syngnathidae | Dwarf seahorse |