| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Hippocampus abdominalis | 166499 | Lesson, 1827 | large seahorse large seahorse | ITIS | valid | | Species |
| Hippocampus alatus | 645002 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus algiricus | 645003 | Kaup, 1856 | | ITIS | valid | | Species |
| Hippocampus angustus | 645004 | Günther, 1870 | | ITIS | valid | | Species |
| Hippocampus barbouri | 645005 | Jordan and Richardson, 1908 | | ITIS | valid | | Species |
| Hippocampus bargibanti | 645006 | Whitley, 1970 | | ITIS | valid | | Species |
| Hippocampus biocellatus | 645007 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus bleekeri | 645008 | Fowler, 1907 | | ITIS | valid | | Species |
| Hippocampus borboniensis | 645009 | Duméril, 1870 | | ITIS | valid | | Species |
| Hippocampus breviceps | 645010 | Peters, 1869 | | ITIS | valid | | Species |
| Hippocampus brevirostris | 166500 | Schinz, 1822 | shortnosed seahorse shortnosed seahorse | ITIS | invalid | junior synonym of Hippocampus hippocampus | Species |
| Hippocampus cameleopardalis | 166501 | Bianconi, 1854 | giraffe seahorse | ITIS | invalid | unavailable, literature misspelling of Hippocampus camelopardalis | Species |
| Hippocampus camelopardalis | 644914 | Bianconi, 1854 | giraffe seahorse | ITIS | valid | | Species |
| Hippocampus capensis | 166502 | Boulenger, 1900 | knysna seahorse Knysna seahorse | ITIS | valid | | Species |
| Hippocampus colemani | 645011 | Kuiter, 2003 | | ITIS | valid | | Species |
| Hippocampus comes | 645012 | Cantor, 1849 | | ITIS | valid | | Species |
| Hippocampus coronatus | 166503 | Temminck and Schlegel, 1850 | common japanese seahorse horned seahorse horned seahorse | ITIS | valid | | Species |
| Hippocampus dahli | 645013 | Ogilby, 1908 | | ITIS | valid | | Species |
| Hippocampus denise | 645014 | Lourie and Randall, 2003 | | ITIS | valid | | Species |
| Hippocampus erectus | 166488 | Perry, 1810 | lined seahorse spotted seahorse caballito erecto caballito estriado | ITIS | valid | | Species |
| Hippocampus fisheri | 645015 | Jordan and Evermann, 1903 | | ITIS | valid | | Species |
| Hippocampus fuscus | 645016 | Rüppell, 1838 | | ITIS | valid | | Species |
| Hippocampus grandiceps | 645017 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus guttulatus | 645018 | Cuvier, 1829 | | ITIS | valid | | Species |
| Hippocampus hendriki | 645019 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus hippocampus | 166497 | (Linnaeus, 1758) | seahorse seahorse | ITIS | valid | | Species |
| Hippocampus histrix | 644933 | Kaup, 1856 | thorny seahorse | ITIS | valid | | Species |
| Hippocampus hudsonius | 166489 | DeKay, 1842 | | ITIS | invalid | junior synonym of Hippocampus erectus | Species |
| Hippocampus hystrix | 166496 | Kaup, 1856 | thorny seahorse thorny seahorse | ITIS | invalid | unavailable, literature misspelling of Hippocampus histrix | Species |
| Hippocampus ingens | 166494 | Girard, 1858 | Pacific giant seahorse Pacific seahorse caballito del Pacífico | ITIS | valid | | Species |
| Hippocampus japonicus | 166504 | Kaup, 1856 | coral seahorse japan seahorse coral seahorse Japan seahorse | ITIS | invalid | junior synonym of Hippocampus mohnikei | Species |
| Hippocampus jayakari | 645020 | Boulenger, 1900 | | ITIS | valid | | Species |
| Hippocampus jugumus | 645021 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus kampylotrachelos | 645022 | Bleeker, 1854 | | ITIS | valid | | Species |
| Hippocampus kelloggi | 645023 | Jordan and Snyder, 1901 | | ITIS | valid | | Species |
| Hippocampus kuda | 166495 | Bleeker, 1852 | spotted seahorse yellow seahorse spotted seahorse yellow seahorse | ITIS | valid | | Species |
| Hippocampus lichtensteinii | 645024 | Kaup, 1856 | | ITIS | valid | | Species |
| Hippocampus minotaur | 645025 | Gomon, 1997 | | ITIS | valid | | Species |
| Hippocampus mohnikei | 644919 | Bleeker, 1853 | | ITIS | valid | | Species |
| Hippocampus montebelloensis | 645026 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus multispinus | 645027 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus novaehollandiae | 166505 | Steindachner, 1866 | crowned seahorse crowned seahorse | ITIS | invalid | junior synonym of Hippocampus whitei | Species |
| Hippocampus obtusus | 166490 | Ginsburg, 1933 | offshore seahorse offshore seahorse | ITIS | invalid | junior synonym of Hippocampus reidi | Species |
| Hippocampus planifrons | 166506 | Peters, 1877 | lowcrowned seahorse lowcrowned seahorse | ITIS | valid | | Species |
| Hippocampus procerus | 645028 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus punctulatus | 166491 | Guichenot, 1853 | horsefish seahorse horsefish seahorse | ITIS | invalid | junior synonym of Hippocampus erectus | Species |
| Hippocampus queenslandicus | 645029 | Horne, 2001 | | ITIS | valid | | Species |
| Hippocampus ramulosus | 166498 | Leach in Leach and Nodder, 1814 | common seahorse common seahorse | ITIS | valid | | Species |
| Hippocampus reidi | 166492 | Ginsburg, 1933 | longsnout seahorse caballito narizon caballito hocico largo | ITIS | valid | | Species |
| Hippocampus semispinosus | 645030 | Kuiter, 2001 | | ITIS | valid | | Species |
| Hippocampus sindonis | 645031 | Jordan and Snyder, 1901 | | ITIS | valid | | Species |
| Hippocampus spinosissimus | 166507 | Weber, 1913 | spiny seahorse spiny seahorse | ITIS | valid | | Species |
| Hippocampus subelongatus | 645032 | Castelnau, 1873 | | ITIS | valid | | Species |
| Hippocampus taeniopterus | 645033 | Bleeker, 1852 | | ITIS | valid | | Species |
| Hippocampus trimaculatus | 166508 | Leach in Leach and Nodder, 1814 | longnose seahorse longnose seahorse | ITIS | valid | | Species |
| Hippocampus whitei | 644920 | Bleeker, 1855 | | ITIS | valid | | Species |
| Hippocampus zebra | 645034 | Whitley, 1964 | | ITIS | valid | | Species |
| Hippocampus zosterae | 166493 | Jordan and Gilbert, 1882 | dwarf seahorse little seahorse pygmy seahorse caballito oliváceo caballito enano | ITIS | valid | | Species |
