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Hippocampus abdominalis Lesson, 1827
- Hippocampus agnesae Fowler, 1907; (synonym)
- Hippocampus bleekeri Fowler, 1907; (synonym)
- Macleayina bleekeri Fowler, 1907; (synonym)
- Hippocampus graciliformis McCulloch, 1911; (synonym)
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Hippocampus algiricus Kaup, 1856
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Hippocampus angustus Gìnther, 1870
- Hippocampus erinaceus Gìnther, 1870; (synonym)
- Hippocampus elongatus Castelnau, 1873; (synonym)
- Hippocampus subelongatus Castelnau, 1873; (synonym)
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Hippocampus aterrimus Jordan & Snyder, 1901
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Hippocampus atrichus
- Hippocampus atrichus De la Pylaie, 1835; (unavailable, no features)
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Hippocampus barbouri Jordan & Richardson, 1908
- Hippocampus aimei Roule, 1916; (synonym)
- Hippocampus arnei Roule, 1916; (emendation)
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Hippocampus bargibanti Whitley, 1970
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Hippocampus bicuspis Kaup, 1856
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Hippocampus borboniensis Dum©ril, 1870
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Hippocampus brachyrhynchus Duncker, 1914
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Hippocampus breviceps Peters, 1869
- Hippocampus tuberculatus Castelnau, 1875; (synonym)
- Farlapiscis breviceps Whitley, 1931; (valid as)
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Hippocampus camelopardalis Bianconi, 1854
- Hippocampus subcoronatus Gìnther, 1867; (synonym)
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Hippocampus capensis Boulenger, 1900
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Hippocampus comes Cantor, 1849
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Hippocampus coronatus Temminck & Schlegel, 1850
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Hippocampus erectus Perry, 1810-11
- Hippocampus hudsonius DeKay, 1842; (synonym)
- Hippocampus fascicularis Kaup (ex Heckel), 1856; (synonym)
- Hippocampus laevicaudatus Kaup (ex Heckel), 1856; (synonym)
- Hippocampus marginalis Kaup (ex Heckel), 1856; (synonym)
- Hippocampus villosus Gìnther, 1880; (synonym)
- Hippocampus stylifer Jordan & Gilbert, 1882; (synonym)
- Hippocampus brunneus Bean, 1906; (synonym)
- Hippocampus kincaidi Townsend & Barbour, 1906; (synonym)
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?Hippocampus fasciatus Kaup, 1853
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Hippocampus fuscus Rìppell, 1838
- Hippocampus obscurus Ehrenberg, 1871; (unavailable, in synonymy)
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Hippocampus gigas
- Hippocampus gigas Dum©ril, 1870; (unavailable, no features)
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Hippocampus hippocampus Perry, 1811
- Syngnathus hippocampus Linnaeus, 1758; (valid as)
- Hippocampus heptagonus Rafinesque, 1810; (synonym)
- Hippocampus antiquorum Leach, 1814; (synonym)
- Hippocampus hippocampus Cuvier, 1816
- Hippocampus vulgaris Cloquet, 1821; (synonym)
- Hippocampus antiquus Risso, 1827; (unavailable, in synonymy)
- Hippocampus brevirostris Cuvier, 1829; (synonym)
- Hippocampus europaeus Ginsburg, 1933; (synonym)
- Hippocampus hippocampus microcoronatus Slastenenko, 1938; (unneeded replacement)
- Hippocampus hippocampus Wheeler, 1973
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Hippocampus histrix Kaup, 1853
- Hippocampus fisheri Jordan & Evermann, 1903; (synonym)
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?Hippocampus hystrix Day, 1878
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Hippocampus ingens Girard, 1858
- Hippocampus gracilis Gill, 1862; (synonym)
- Hippocampus ecuadorensis Fowler, 1922; (synonym)
- Hippocampus hildebrandi Ginsburg, 1933; (synonym)
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Hippocampus japonicus Kaup, 1853
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Hippocampus jayakari Boulenger, 1900
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?Hippocampus jubatus De la Pylaie, 1835
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Hippocampus kaupii
- Hippocampus punctulatus Kaup, 1856; (1 homonym)
- Hippocampus kaupii Dum©ril, 1870; (replacement)
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Hippocampus kelloggi Jordan & Snyder, 1901
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Hippocampus kuda Bleeker, 1852
- Hippocampus moluccensis Bleeker, 1852; (synonym)
- Hippocampus taeniopterus Bleeker, 1852; (synonym)
- Hippocampus melanospilos Bleeker, 1854; (synonym)
- Hippocampus polytaenia Bleeker, 1854; (synonym)
- Hippocampus chinensis Basilewsky, 1855; (synonym)
- Hippocampus rhynchomacer Dum©ril, 1870; (synonym)
- Hippocampus hilonis Jordan & Evermann, 1903; (synonym)
- Hippocampus taeniops Fowler, 1904; (synonym)
- Hippocampus ringens Jordan & Evermann, 1905; (synonym)
- Hippocampus natalensis von Bonde, 1923; (synonym)
- Hippocampus horai Duncker, 1926; (synonym)
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Hippocampus lichtensteinii Kaup, 1856
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Hippocampus minotaur Gomon, 1997
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Hippocampus mohnikei
- Hippocampus mohnikei Bleeker, 1854; (unavailable, no features)
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Hippocampus novaehebudorum
- Hippocampus novae-hebudorum Fowler, 1944; (misspelling)
- Hippocampus novaehebudorum Fowler, 1944; (misspelling)
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?Hippocampus pentagonus Ginsburg, 1937
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Hippocampus planifrons Peters, 1877
- Hippocampus dahli Ogilby, 1908; (synonym)
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Hippocampus punctulatus Guichenot, 1853
- Hippocampus deanei Dum©ril, 1861; (synonym)
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?Hippocampus raji Whitley, 1955
- Hippocampus kuda multiannularis Raj, 1941; (1 homonym)
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Hippocampus ramulosus Leach, 1814
- Hippocampus longirostris Schinz, 1822; (synonym)
- Hippocampus rosaceus Risso, 1827; (synonym)
- Hippocampus guttulatus Cuvier, 1829; (synonym)
- Hippocampus obscurus Hemprich & Ehrenberg, 1856; (unavailable, in passing)
- Hippocampus obscurus Hemprich & Ehrenberg, 1856; (unavailable, no features)
- Hippocampus filamentosus Dum©ril, 1870; (unavailable, in synonymy)
- Hippocampus guttulatus multiannularis Ginsburg, 1937; (synonym)
- Hippocampus hippocampus microstephanus Slastenenko, 1937; (synonym)
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Hippocampus reidi Ginsburg, 1933
- Hippocampus obtusus Ginsburg, 1933; (synonym)
- Hippocampus poeyi Howell Rivero, 1934; (synonym)
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Hippocampus rondeletii
- Hippocampus rondeletii Yarrell (ex Willughby), 1841; (unavailable, in synonymy)
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Hippocampus sindonis Jordan & Snyder, 1901
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Hippocampus spinosissimus Weber, 1913
- Hippohystrix spinosissima Whitley, 1940; (valid as)
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Hippocampus suezensis Duncker, 1940
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Hippocampus trimaculatus Leach, 1814
- Hippocampus mannulus Cantor, 1849; (synonym)
- Hippocampus kampylotrachelos Bleeker, 1854; (synonym)
- Hippocampus manadensis Bleeker, 1856; (synonym)
- Hippocampus sexmaculatus Kaup (ex Schlegel), 1856; (synonym)
- Hippocampus takakurae Tanaka, 1916; (synonym)
- Hippocampus tatakurae Gomon, 1997; (synonym)
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?Hippocampus valentini Bleeker, 1859
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Hippocampus whitei Bleeker, 1855
- Hippocampus novae hollandiae Steindachner, 1866; (misspelling)
- Hippocampus novaehollandiae Steindachner, 1866; (synonym)
- Hippocampus tristis Castelnau, 1872; (synonym)
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Hippocampus zebra Whitley, 1964
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Hippocampus zosterae Jordan & Gilbert, 1882
- Hippocampus rosamondae Borodin, 1928; (synonym)
- Hippocampus regulus Ginsburg, 1933; (synonym)
- Jamsus regulus Ginsburg, 1937; (valid as)