| Nominal Species (n = 621) | Present allocation (n = 307) | Ref. |
|---|---|---|
| Syngnathus abaster Risso, 1827 | Syngnathus abaster | 6733 |
| Syngnathus abaster ganzirriensis D'Ancona, 1934 | Syngnathus abaster | 13696 |
| Hippocampus abdominalis Lesson, 1827 | Hippocampus abdominalis | 9003 |
| Syngnathus acicularis Jenyns, 1842 | Leptonotus blainvilleanus | 5316 |
| Doryichthys aculeatus Kaup, 1856 | Microphis aculeatus | 4509 |
| Syngnathus acus Linnaeus, 1758 | Syngnathus acus | 13696 |
| Syngnathus acusimilis Günther, 1873 | Syngnathus schlegeli | 5316 |
| Syngnathus aequoreus Linnaeus, 1758 | Entelurus aequoreus | 7501 |
| Lissocampus affinis Whitley, 1944 | Lissocampus runa | 5316 |
| Syngnathus affinis Günther, 1870 | Syngnathus affinis | 3814 |
| Syngnathus agassiz Michahelles, 1829 | Syngnathus abaster | 13696 |
| Syngnathus agassizii Michahelles, 1829 | Syngnathus abaster | 4127 |
| Hippocampus agnesae Fowler, 1907 | Hippocampus abdominalis | 115213 |
| Hippocampus alatus Kuiter, 2001 | Hippocampus spinosissimus | 115213 |
| Corythoichthys albirostris Kaup, 1856 | Cosmocampus albirostris | 1830 |
| Hippichthys albomaculosus Jenkins & Mailautoka, 2010 | Hippichthys albomaculosus | 85066 |
| Syngnathoides algensis Fourmanoir, 1955 | Acentronura tentaculata | 5316 |
| Syngnathus algeriensis Günther, 1870 | Syngnathus abaster | 13696 |
| Hippocampus algiricus Kaup, 1856 | Hippocampus algiricus | 30915 |
| Syngnathus alternans Günther, 1870 | Syngnathus acus | 13696 |
| Syngnathus altirostris Ogilby, 1890 | Hippichthys penicillus | 5316 |
| Hippichthys amakusensis Tomiyama, 1972 | Festucalex erythraeus | 5316 |
| Corythoichthys amplexus Dawson & Randall, 1975 | Corythoichthys amplexus | 2334 |
| Syngnathus analicarens Duncker, 1915 | Bryx analicarens | 12965 |
| Syngnathus andersonii Bleeker, 1858 | Micrognathus andersonii | 5316 |
| Syngnathus anguisigola Nardo, 1847 | Syngnathus abaster | 13696 |
| Hippocampus angustus (non Günther, 1870) | Hippocampus subelongatus | 30915 |
| Hippocampus angustus Günther, 1870 | Hippocampus angustus | 30915 |
| Microphis annandalei Hora, 1924 | Doryichthys deokhatoides | 5316 |
| Ichthyocampus annulatus Macleay, 1878 | Trachyrhamphus bicoarctatus | 5316 |
| Scyphius annulatus Risso, 1827 | Nerophis maculatus | 7501 |
| Syngnathus ansorgii Boulenger, 1910 | Enneacampus ansorgii | 4127 |
| Hippocampus antiquorum Leach, 1814 | Hippocampus hippocampus | 30915 |
| Hippocampus antiquus Risso, 1827 | Hippocampus hippocampus | 30915 |
| Siphostoma arctum Jenkins & Evermann, 1889 | Cosmocampus arctus | 5316 |
| Syngnathus argentatus Pallas, 1814 | Syngnathus typhle | 13696 |
| Syngnathus argulus Peters, 1855 | Microphis argulus | 5316 |
| Syngnathus argus Richardson, 1840 | Stigmatopora argus | 5316 |
| Syngnathus argus (non Richardson, 1840) | Microphis argulus | 5316 |
| Stigmatophora argus brevicaudata Lucas, 1891 | Stigmatopora argus | 75154 |
| Syngnathus argyrostictus Kaup, 1856 | Hippichthys penicillus | 5316 |
| Festucalex armillatus Prokofiev, 2016 | Festucalex armillatus | 129452 |
| Hippocampus arnei Roule, 1916 | Hippocampus spinosissimus | 30915 |
| Hippocampus arnei Roule, 1916 | Hippocampus barbouri | 30915 |
| Hippocampus aterrimus Jordan & Snyder, 1902 | Hippocampus kuda | 30915 |
| Siphostoma auliscus Swain, 1882 | Syngnathus auliscus | 5316 |
| Doryrhamphus aurolineatus Randall & Earle, 1994 | Doryrhamphus aurolineatus | 10678 |
| Doryichthys auronitens Kaup, 1856 | Microphis brachyurus | 5316 |
| Acentronura australe Waite & Hale, 1921 | Idiotropiscis australis | 5316 |
| Dunckerocampus baldwini Herald & Randall, 1972 | Dunckerocampus baldwini | 86689 |
| Corythoichthys balli Fowler, 1925 | Cosmocampus balli | 5316 |
| Syngnathus banneri Herald & Randall, 1972 | Cosmocampus banneri | 4281 |
| Ichthyocampus bannwarthi Duncker, 1915 | Lissocampus bannwarthi | 5316 |
| Hippocampus barbouri Jordan & Richardson, 1908 | Hippocampus barbouri | 30915 |
| Hippocampus bargibanti Whitley, 1970 | Hippocampus bargibanti | 30915 |
| Kimblaeus bassensis Dawson, 1980 | Kimblaeus bassensis | 5316 |
| Ichthyocampus belcheri Kaup, 1856 | Phoxocampus belcheri | 5316 |
| Corythoichthys benedetto Allen & Erdmann, 2008 | Corythoichthys benedetto | 74959 |
| Dunckerocampus bentuviae Fowler & Steinitz, 1956 | Dunckerocampus multiannulatus | 5316 |
| Siokunichthys bentuviai Clark, 1966 | Siokunichthys bentuviai | 5173 |
| Doryichthys bernsteini Bleeker, 1867 | Microphis manadensis | 5316 |
| Syngnathus biaculeatus Bloch, 1785 | Syngnathoides biaculeatus | 5316 |
| Doryrhamphus bicarinatus Dawson, 1981 | Doryrhamphus bicarinatus | 4281 |
| Yozia bicoarctata erythraeensis Dollfus & Petit, 1938 | Trachyrhamphus bicoarctatus | 5316 |
| Yozia bicoarctata melanesiae Fowler, 1945 | Trachyrhamphus bicoarctatus | 5316 |
| Syngnathus bicoarctatus Bleeker, 1857 | Trachyrhamphus bicoarctatus | 5316 |
| Hippocampus bicuspis Kaup, 1856 | Hippocampus guttulatus | 30915 |
| Ichthyocampus bikiniensis Herald, 1953 | Ichthyocampus bikiniensis | 46206 |
| Doryichthys bilineatus Kaup, 1856 | Doryichthys deokhatoides | 5316 |
| Coelonotus biocellatus Günther, 1870 | Microphis argulus | 5316 |
| Hippocampus biocellatus Kuiter, 2001 | Hippocampus planifrons | 115213 |
| Syngnathus biserialis Kaup, 1856 | Hippichthys penicillus | 5316 |
| Syngnathus blainvilleanus Eydoux & Gervais, 1837 | Leptonotus blainvilleanus | 5316 |
| Hippocampus bleekeri Fowler, 1907 | Hippocampus abdominalis | 30915 |
| Microphis bleekeri Day, 1865 | Microphis brachyurus | 5316 |
| Syngnathoides blochii Bleeker, 1851 | Syngnathoides biaculeatus | 5316 |
| Syngnathus boaja Bleeker, 1850 | Doryichthys boaja | 5316 |
| Stigmatopora boops Castelnau, 1872 | Stigmatopora nigra | 86697 |
| Micrognathus boothae Whitley, 1964 | Halicampus boothae | 5316 |
| Hippocampus borboniensis Duméril, 1870 | Hippocampus borboniensis | 30915 |
| Dunckerocampus boylei Kuiter, 1998 | Dunckerocampus boylei | 31080 |
| Syngnathus brachycephalus Poey, 1868 | Cosmocampus brachycephalus | 12965 |
| Micrognathus brachyrhinus Herald, 1953 | Minyichthys brachyrhinus | 5316 |
| Doryichthys brachyrhynchops Fowler, 1934 | Doryichthys martensii | 5316 |
| Hippocampus brachyrhynchus Duncker, 1914 | Hippocampus fuscus | 30915 |
| Syngnathus brachyrhynchus Kaup, 1856 | Syngnathus acus | 13696 |
| Syngnathus brachysoma Bleeker, 1855 | Choeroichthys brachysoma | 5316 |
| Syngnathus brachyurus Bleeker, 1854 | Microphis brachyurus | 4281 |
| Enchelyocampus brauni Dawson & Allen, 1978 | Bulbonaricus brauni | 5316 |
| Siphostoma brevicaudum Meek, 1904 | Microphis lineatus | 79722 |
| Syngnathus brevicaudus Castelnau, 1875 | Trachyrhamphus bicoarctatus | 5316 |
| Hippocampus breviceps Peters, 1869 | Hippocampus breviceps | 7300 |
| Siokunichthys breviceps Smith, 1963 | Siokunichthys breviceps | 5173 |
| Micrognathus brevicorpus Fricke, 2004 | Micrognathus brevicorpus | 75989 |
| Doryrhamphus brevidorsalis de Beaufort, 1913 | Lophocampus brevidorsalis | 5316 |
| Acentronura breviperula Fraser-Brunner & Whitley, 1949 | Acentronura breviperula | 90102 |
| Hippocampus brevirostris Schinz, 1822 | Hippocampus hippocampus | 30915 |
| Syngnathus brevirostris Rüppell, 1838 | Micrognathus brevirostris | 5316 |
| Histiogamphelus briggsii McCulloch, 1914 | Histiogamphelus briggsii | 5316 |
| Histiogamphelus briggsii orae Whitley, 1950 | Histiogamphelus briggsii | 5316 |
| Micrognathus brocki Herald, 1953 | Halicampus brocki | 26282 |
| Bulbonaricus brucei Dawson, 1984 | Bulbonaricus brucei | 5316 |
| Hippocampus brunneus Bean, 1906 | Hippocampus erectus | 30915 |
| Syngnathus bucculentus Rathke, 1837 | Syngnathus abaster | 13696 |
| Syngnathus budi Bleeker, 1856 | Microphis leiaspis | 5316 |
| Trachyrhamphus caba Seale, 1910 | Halicampus grayi | 5316 |
| Syngnathus caballus Larrañaga, 1923 | Hippocampus erectus | 115213 |
| Syngnathus caldwelli Herald & Randall, 1972 | Cosmocampus howensis | 5316 |
| Doryrhamphus californiensis Gill, 1862 | Doryrhamphus excisus | 5373 |
| Syngnathus californiensis Storer, 1845 | Syngnathus californiensis | 2850 |
| Hippocampus camelopardalis Bianconi, 1854 | Hippocampus camelopardalis | 4281 |
| Hippocampus camelopardalis (non Bianconi, 1854) | Hippocampus whitei | 30915 |
| Hippocampus capensis Boulenger, 1900 | Hippocampus capensis | 4281 |
| Syngnathus carce Hamilton, 1822 | Ichthyocampus carce | 5316 |
| Syngnathus caretta Klunzinger, 1880 | Pugnaso curtirostris | 5316 |
| Syngnathus caribbaeus Dawson, 1979 | Syngnathus caribbaeus | 13608 |
| Siphostoma carinatum Gilbert, 1892 | Syngnathus carinatus | 5316 |
| Urocampus carinirostris Castelnau, 1872 | Urocampus carinirostris | 7300 |
| Syngnathus caspius Eichwald, 1831 | Syngnathus caspius | 13696 |
| Hippocampus casscsio Zhang, Qin, Wang & Lin, 2016 | Hippocampus casscsio | 116585 |
| Leptoichthys castelnaui Macleay, 1881 | Leptoichthys fistularius | 5316 |
| Lissocampus caudalis Waite & Hale, 1921 | Lissocampus caudalis | 5316 |
| Microphis caudatus Peters, 1869 | Lophocampus retzii | 94476 |
| Doryichthys caudocarinatus Weber, 1907 | Microphis caudocarinatus | 5316 |
| Acanthognathus caulleryi Chabanaud, 1929 | Dunckerocampus dactyliophorus | 5316 |
| Dunckerocampus caulleryi chapmani Herald, 1953 | Dunckerocampus chapmani | 5316 |
| Syngnathus cayennensis Sauvage, 1882 | Microphis lineatus | 79722 |
| Syngnathus chihiroe Matsunuma, 2017 | Syngnathus chihiroe | 126547 |
| Acmonotus chilensis Philippi, 1896 | Leptonotus blainvilleanus | 5316 |
| Hippocampus chinensis Basilewsky, 1855 | Hippocampus kuda | 30915 |
| Doryichthys chokderi Ataur Rahman, 1976 | Microphis cuncalus | 4833 |
| Choeroichthys cinctus Dawson, 1976 | Choeroichthys cinctus | 5316 |
| Syngnathus cinctus Ramsay, 1882 | Festucalex cinctus | 5316 |
| Bryx clarionensis Fritzsche, 1980 | Bryx veleronis | 5316 |
| Syngnathus coccineus Herald, 1940 | Cosmocampus coccineus | 5316 |
| Hippocampus colemani Kuiter, 2003 | Hippocampus colemani | 50838 |
| Hippocampus comes Cantor, 1849 | Hippocampus comes | 30915 |
| Yozia compitalis Whitley, 1950 | Trachyrhamphus bicoarctatus | 5316 |
| Yozia compitalis samaraiensis Kähsbauer, 1970 | Trachyrhamphus bicoarctatus | 5316 |
| Halicampus conspicillatus Kaup, 1856 | Halicampus grayi | 5316 |
| Syngnathus conspicillatus (non Jenyns, 1842) | Corythoichthys haematopterus | 33390 |
| Syngnathus conspicillatus Jenyns, 1842 | Corythoichthys conspicillatus | 74959 |
| Doryichthys contiguus Kottelat, 2000 | Doryichthys contiguus | 36949 |
| Hippocampus coronatus Temminck & Schlegel, 1850 | Hippocampus coronatus | 559 |
| Hippocampus coronatus (non Temminck & Schlegel, 1850) | Hippocampus sindonis | 30915 |
| Corythoichthys corrugatus Weber, 1913 | Bhanotia fasciolata | 5380 |
| Syngnathus corrugatus Weber, 1913 | Bhanotia fasciolata | 5380 |
| Leptonotus costatus Waite & Hale, 1921 | Kaupus costatus | 5316 |
| Syngnathus crenulatus Weber, 1913 | Corythoichthys haematopterus | 5316 |
| Siphostoma crinigerum Bean & Dresel, 1884 | Anarchopterus criniger | 12965 |
| Syngnathus crinitus Jenyns, 1842 | Micrognathus crinitus | 3288 |
| Ichthyocampus cristatus McCulloch & Waite, 1918 | Stipecampus cristatus | 5316 |
| Leptoichthys cristatus Macleay, 1881 | Histiogamphelus cristatus | 5316 |
| Microphis cruentus Dawson & Fourmanoir, 1981 | Microphis cruentus | 5316 |
| Syngnathus cuncalus Hamilton, 1822 | Microphis cuncalus | 4833 |
| Syngnathus curtirostris Castelnau, 1872 | Pugnaso curtirostris | 5316 |
| Hippocampus curvicuspis Fricke, 2004 | Hippocampus curvicuspis | 75989 |
| Hippocampus curvicuspis (non Fricke, 2004) | Hippocampus histrix | 115213 |
| Syngnathus cyanospilos Bleeker, 1854 | Hippichthys cyanospilos | 5316 |
| Syngnathus dactyliophorus Bleeker, 1853 | Dunckerocampus dactyliophorus | 86771 |
| Hippocampus dahli Ogilby, 1908 | Hippocampus dahli | 115213 |
| Syngnathus darrosanus Dawson & Randall, 1975 | Cosmocampus darrosanus | 26282 |
| Ichthyocampus davaoensis Herald, 1953 | Bulbonaricus davaoensis | 5316 |
| Micrognathus dawsoni Herald, 1969 | Syngnathus dawsoni | 46206 |
| Hippocampus deanei Duméril, 1861 | Hippocampus algiricus | 30915 |
| Hippocampus debelius Gomon & Kuiter, 2009 | Hippocampus debelius | 80667 |
| Syngnathus delalandi Kaup, 1856 | Syngnathus acus | 13696 |
| Siphostoma dendriticum Barbour, 1905 | Amphelikturus dendriticus | 26282 |
| Hippocampus denise Lourie & Randall, 2003 | Hippocampus denise | 47053 |
| Syngnathus deocata Hamilton, 1822 | Microphis deocata | 4833 |
| Syngnathus deokhatoides Bleeker, 1854 | Doryichthys deokhatoides | 5316 |
| Stigmatophora depressiuscula Macleay, 1881 | Stigmatopora argus | 5316 |
| Phyllopteryx dewysea Stiller, Wilson & Rouse, 2015 | Phyllopteryx dewysea | 100032 |
| Ichthyocampus diacanthus Schultz, 1943 | Phoxocampus diacanthus | 26282 |
| Syngnathus djarong Bleeker, 1853 | Hippichthys heptagonus | 5316 |
| Syngnathus djarong luzonica Aurich, 1935 | Hippichthys heptagonus | 94476 |
| Syngnathus dumerilii Duméril, 1870 | Syngnathus rostellatus | 93033 |
| Doryichthys dunckeri Prashad & Mukerji, 1929 | Microphis dunckeri | 4833 |
| Micrognathus dunckeri Chabanaud, 1929 | Halicampus dunckeri | 4281 |
| Solegnathus dunckeri Whitley, 1927 | Solegnathus dunckeri | 7300 |
| Syngnathus dunckeri Metzelaar, 1919 | Bryx dunckeri | 3814 |
| Hippocampus ecuadorensis Fowler, 1922 | Hippocampus ingens | 30915 |
| Ichthyocampus edmondsoni Pietschmann, 1928 | Halicampus edmondsoni | 5316 |
| Siphostoma eigenmanni Wilson, 1916 | Microphis lineatus | 79722 |
| Siphostoma elcapitanense Meek & Hildebrand, 1914 | Pseudophallus elcapitanensis | 5316 |
| Nannocampus elegans Smith, 1953 | Nannocampus elegans | 4281 |
| Corythroichthys elerae Evermann & Seale, 1907 | Corythoichthys haematopterus | 5316 |
| Doryichthys elevatus Hutton, 1872 | Leptonotus elevatus | 5316 |
| Hippocampus elongatus Castelnau, 1873 | Hippocampus subelongatus | 30915 |
| Siokunichthys elongatus Herre, 1953 | Siokunichthys herrei | 5173 |
| Syngnathus elucens Poey, 1868 | Cosmocampus elucens | 7251 |
| Corythroichthys ensenadae Silvester, 1915 | Micrognathus crinitus | 35505 |
| Apterygocampus epinnulatus Weber, 1913 | Apterygocampus epinnulatus | 5316 |
| Phyllopteryx eques Günther, 1865 | Phycodurus eques | 12965 |
| Gasterosteus equus Cabrera, Pérez & Haenseler, 1817 | Hippocampus hippocampus | 115213 |
| Hippocampus erectus Perry, 1810 | Hippocampus erectus | 7251 |
| Hippocampus erinaceus Günther, 1870 | Hippocampus angustus | 30915 |
| Micrognathus erugatus Herald & Dawson, 1974 | Micrognathus erugatus | 26938 |
| Ichthyocampus erythraeus (non Gilbert, 1905) | Festucalex kulbickii | 75989 |
| Ichthyocampus erythraeus Gilbert, 1905 | Festucalex erythraeus | 5316 |
| Syngnathus ethon Risso, 1827 | Syngnathus abaster | 13696 |
| Syngnathus ethon aeolicus Di Caporiacco, 1948 | Syngnathus abaster | 13696 |
| Syngnathus euchrous Fritzsche, 1980 | Syngnathus euchrous | 2850 |
| Hippocampus europaeus Ginsburg, 1933 | Hippocampus hippocampus | 115213 |
| Doryrhamphus excisus Kaup, 1856 | Doryrhamphus excisus | 117576 |
| Doryrhamphus excisus abbreviatus Dawson, 1981 | Doryrhamphus abbreviatus | 5316 |
| Siphostoma exile Osburn & Nichols, 1916 | Syngnathus exilis | 5316 |
| Microphis extensus Snyder, 1911 | Doryrhamphus excisus | 5373 |
| Doryichthys falkensteini Reichenow, 1878 | Microphis aculeatus | 4127 |
| Solegnathus fasciatus Günther, 1880 | Solegnathus spinosissimus | 9563 |
| Solenognathus fasciatus Günther, 1880 | Solegnathus spinosissimus | 50838 |
| Syngnathus fasciatus (non Risso, 1810) | Corythoichthys haematopterus | 5316 |
| Syngnathus fasciatus Gray, 1830 | Corythoichthys haematopterus | 27116 |
| Syngnathus fasciatus Risso, 1810 | Nerophis maculatus | 7501 |
| Hippocampus fascicularis Kaup, 1856 | Hippocampus erectus | 30915 |
| Corythoichthys fasciculatus Kaup, 1853 | Bhanotia fasciolata | 5380 |
| Syngnathus fasciolatus Duméril, 1870 | Bhanotia fasciolata | 5380 |
| Campichthys fatiloquus Whitley, 1943 | Lissocampus fatiloquus | 5316 |
| Hippocampus filamentosus Duméril, 1870 | Hippocampus guttulatus | |
| Ichthyocampus filum (non Günther, 1870) | Lissocampus runa | 5316 |
| Ichthyocampus filum Günther, 1870 | Lissocampus filum | 5316 |
| Hippocampus fisheri Jordan & Evermann, 1903 | Hippocampus fisheri | 30915 |
| Leptoichthys fistularius Kaup, 1853 | Leptoichthys fistularius | 5316 |
| Syngnathus flavescens Kaup, 1856 | Syngnathus abaster | 13696 |
| Syngnathus flavofasciatus Rüppell, 1838 | Corythoichthys flavofasciatus | 5316 |
| Corythoichthys flindersi Scott, 1957 | Vanacampus vercoi | 5316 |
| Siphostoma floridae Jordan & Gilbert, 1882 | Syngnathus floridae | 12965 |
| Syngnathus fluviatilis (non Peters, 1852) | Doryichthys deokhatoides | 5316 |
| Syngnathus fluviatilis Peters, 1852 | Microphis fluviatilis | 4127 |
| Syngnathus foliatus Shaw, 1804 | Phyllopteryx taeniolatus | 50838 |
| Syngnathus folletti Herald, 1942 | Syngnathus folletti | 46206 |
| Penetopteryx fowleri Whitley, 1933 | Penetopteryx taeniocephalus | 5316 |
| Hippocampus fuscus Rüppell, 1838 | Hippocampus fuscus | 12255 |
| Syngnathus fuscus Storer, 1839 | Syngnathus fuscus | 6330 |
| Ichthyocampus galei Duncker, 1909 | Campichthys galei | 5316 |
| Histiogamphelus gallinaceus Hale, 1941 | Histiogamphelus cristatus | 5316 |
| Syngnathus gastrotaenia Bleeker, 1853 | Hippichthys spicifer | 5316 |
| Hippichthys gazella Whitley, 1947 | Hippichthys penicillus | 5316 |
| Atelurus germani Duméril, 1870 | Acentronura gracilissima | 5316 |
| Festucalex gibbsi (non Dawson, 1977) | Festucalex kulbickii | 75989 |
| Festucalex gibbsi Dawson, 1977 | Festucalex gibbsi | 5316 |
| Phanerotokeus gohari Duncker, 1940 | Halicampus macrorhynchus | 5316 |
| Hippocampus graciliformis McCulloch, 1911 | Hippocampus abdominalis | 30915 |
| Gastrotokeus gracilis Klunzinger, 1872 | Stigmatopora argus | 5316 |
| Hippocampus gracilis Gill, 1862 | Hippocampus ingens | 30915 |
| Stigmatophora gracilis Macleay, 1881 | Stigmatopora argus | 5316 |
| Syngnathus gracilis Steindachner, 1901 | Hippichthys spicifer | 5316 |
| Hippocampus gracilissimus Temminck & Schlegel, 1850 | Acentronura gracilissima | 5316 |
| Hippocampus grandiceps Kuiter, 2001 | Hippocampus angustus | 115213 |
| Halicampus grayi (non Kaup, 1856) | Halicampus mataafae | 33390 |
| Halicampus grayi Kaup, 1856 | Halicampus grayi | 5316 |
| Syngnathus griseolineatus Ayres, 1854 | Syngnathus leptorhynchus | 6885 |
| Solegnathus guentheri Duncker, 1915 | Solegnathus lettiensis | 46552 |
| Solegnathus güntheri Duncker, 1915 | Solegnathus lettiensis | 116434 |
| Hippocampus guttulatus (non Cuvier, 1829) | Hippocampus histrix | 33390 |
| Hippocampus guttulatus Cuvier, 1829 | Hippocampus guttulatus | 30915 |
| Hippocampus guttulatus multiannularis Ginsburg, 1937 | Hippocampus guttulatus | 30915 |
| Choeroichthys hadiatyae Allen, G.; Erdmann, M. & Hidayat, N., 2020 | Choeroichthys hadiatyae | 123125 |
| Hippocampus haema Han, Kim, Kai & Senou, 2017 | Hippocampus haema | 117115 |
| Syngnathus haematopterus Bleeker, 1851 | Corythoichthys haematopterus | 5316 |
| Stigmatopora harastii Short & Trevor-Jones, 2020 | Stigmatopora harastii | 123272 |
| Syngnathus hardwickii Gray, 1830 | Solegnathus hardwickii | 33390 |
| Doryichthys hasselti Kaup, 1856 | Microphis brachyurus | 5316 |
| Syngnathus helfrichii Bleeker, 1855 | Hippichthys heptagonus | 5316 |
| Hippocampus hendriki Kuiter, 2001 | Hippocampus angustus | 115213 |
| Hippichthys heptagonus Bleeker, 1849 | Hippichthys heptagonus | 5316 |
| Hippocampus heptagonus Rafinesque, 1810 | Hippocampus hippocampus | 30915 |
| Typhle heptagonus Rafinesque, 1810 | Syngnathus acus | 81932 |
| Bryx heraldi Fritzsche, 1980 | Cosmocampus heraldi | 5316 |
| Siokunichthys herrei Herald, 1953 | Siokunichthys herrei | 5173 |
| Syngnathus heterosoma Bleeker, 1851 | Doryichthys heterosoma | 5316 |
| Tiphle hexagonus Rafinesque, 1810 | Syngnathus typhle | 13696 |
| Hippocampus hildebrandi Ginsburg, 1933 | Hippocampus ingens | 30915 |
| Syngnathus hildebrandi Herald, 1965 | Cosmocampus hildebrandi | 3814 |
| Hippocampus hilonis Jordan & Evermann, 1903 | Hippocampus kuda | 30915 |
| Syngnathus hippocampus Linnaeus, 1758 | Hippocampus hippocampus | 4509 |
| Hippocampus hippocampus microcoronatus Slastenenko, 1938 | Hippocampus guttulatus | 30915 |
| Hippocampus hippocampus microstephanus Slastenenko, 1937 | Hippocampus guttulatus | 30915 |
| Hippocampus histrix (non Kaup, 1856) | Hippocampus jugumus | 42735 |
| Hippocampus histrix (non Kaup, 1856) | Hippocampus curvicuspis | 75989 |
| Hippocampus histrix (non Kaup, 1856) | Hippocampus barbouri | 30915 |
| Hippocampus histrix Kaup, 1856 | Hippocampus histrix | 10685 |
| Hippocampus histrix (non Kaup, 1856) | Hippocampus spinosissimus | 30915 |
| Hippocampus histrix (non Kaup, 1856) | Hippocampus angustus | 30915 |
| Hippocampus horai Duncker, 1926 | Hippocampus kuda | 30915 |
| Hypselognathus horridus Dawson & Glover, 1982 | Hypselognathus horridus | 5316 |
| Parasyngnathus howensis Whitley, 1948 | Cosmocampus howensis | 5316 |
| Hippocampus hudsonius DeKay, 1842 | Hippocampus erectus | 1743 |
| Syngnathus hunnii Bleeker, 1860 | Hippichthys spicifer | 5316 |
| Microphis ignoratus Vaillant, 1902 | Doryichthys martensii | 5316 |
| Syngnathus independencia Hildebrand, 1946 | Cosmocampus coccineus | 5316 |
| Hippocampus ingens Girard, 1858 | Hippocampus ingens | 30915 |
| Syngnathus insulae Fritzsche, 1980 | Syngnathus insulae | 5316 |
| Corythoichthys insularis Dawson, 1977 | Corythoichthys insularis | 5316 |
| Doryichthys insularis Hora, 1925 | Oostethus insularis | 94476 |
| Syngnatus intestinalis Ramsay, 1881 | Corythoichthys intestinalis | 5316 |
| Minyichthys inusitatus Dawson, 1983 | Minyichthys inusitatus | 35628 |
| Syngnathus investigatoris Hora, 1926 | Cosmocampus investigatoris | 12965 |
| Corythroichthys isigakius Jordan & Snyder, 1901 | Corythoichthys haematopterus | 5316 |
| Pristidoryrhamphus jacksoni Fowler, 1944 | Doryrhamphus negrosensis | 5373 |
| Microphis jagorii Peters, 1868 | Oostethus jagorii | 5316 |
| Dentirostrum janssi Herald & Randall, 1972 | Doryrhamphus janssi | 5373 |
| Hippocampus japapigu Short, Smith, Motomura, Harasti & Hamilton, 2018 | Hippocampus japapigu | 118476 |
| Hippocampus japonicus Kaup, 1856 | Hippocampus mohnikei | 30915 |
| Hippocampus jayakari Boulenger, 1900 | Hippocampus jayakari | 30915 |
| Hippocampus jayakari (non Boulenger, 1900) | Hippocampus curvicuspis | 75989 |
| Syngnathus jonesii Günther, 1874 | Micrognathus crinitus | 54621 |
| Microphis jouani Duméril, 1870 | Microphis brachyurus | 5316 |
| Hippocampus jugumus Kuiter, 2001 | Hippocampus jugumus | 42735 |
| Doryichthys juillerati Rochebrune, 1880 | Microphis aculeatus | 4127 |
| Syngnathus jullieni Sauvage, 1874 | Doryichthys boaja | 5316 |
| Ichthyocampus kampeni Weber, 1913 | Phoxocampus tetrophthalmus | 5316 |
| Hippocampus kampylotrachelos Bleeker, 1854 | Hippocampus trimaculatus | 30915 |
| Syngnathus kaupi Bleeker, 1863 | Enneacampus kaupi | 4127 |
| Hippocampus kaupii Duméril, 1870 | Hippocampus algiricus | 30915 |
| Parabelonichthys kellersi Fowler, 1943 | Microphis mento | 5316 |
| Hippocampus kelloggi Jordan & Snyder, 1901 | Hippocampus kelloggi | 30915 |
| Hippocampus kincaidi Townsend & Barbour, 1906 | Hippocampus erectus | 30915 |
| Syngnathus koilomatodon Bleeker, 1858 | Halicampus grayi | 5316 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus fisheri | 30915 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus barbouri | 30915 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus spinosissimus | 42735 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus tristis | 123057 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus fuscus | 30915 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus borboniensis | 30915 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus curvicuspis | 75989 |
| Hippocampus kuda Bleeker, 1852 | Hippocampus kuda | 30915 |
| Hippocampus kuda (non Bleeker, 1852) | Hippocampus comes | 30915 |
| Hippocampus kuda multiannularis Raj, 1941 | Hippocampus kuda | 30915 |
| Syngnathus kuhlii Kaup, 1856 | Hippichthys cyanospilos | 5316 |
| Festucalex kulbickii Fricke, 2004 | Festucalex kulbickii | 75989 |
| Hippocampus laevicaudatus Kaup, 1856 | Hippocampus erectus | 30915 |
| Acentronura larsonae Dawson, 1984 | Idiotropiscis larsonae | 5316 |
| Choeroichthys latispinosus Dawson, 1978 | Choeroichthys latispinosus | 5316 |
| Syngnathus leiaspis Bleeker, 1854 | Microphis leiaspis | 5316 |
| Hippocampus lenis De Vis, 1908 | Hippocampus trimaculatus | 92135 |
| Syngnathus leptorhynchus Girard, 1854 | Syngnathus leptorhynchus | 2850 |
| Solegnathus lettiensis Bleeker, 1860 | Solegnathus lettiensis | 5316 |
| Hippocampus lichtensteinii (non Kaup, 1856) | Hippocampus debelius | 80667 |
| Hippocampus lichtensteinii Kaup, 1856 | Hippocampus lichtensteinii | 30915 |
| Doryichthys lineatus Kaup, 1856 | Microphis lineatus | 26455 |
| Doryichthys lineatus (non Kaup, 1856) | Microphis aculeatus | 4509 |
| Scyphius littoralis Risso, 1827 | Nerophis ophidion | 13696 |
| Hippocampus longirostris Schinz, 1822 | Hippocampus guttulatus | 12255 |
| Stigmatopora longirostris Hutton, 1872 | Stigmatopora macropterygia | 86697 |
| Trachyrhamphus longirostris Kaup, 1856 | Trachyrhamphus longirostris | 7300 |
| Syngnathus louisianae Günther, 1870 | Syngnathus louisianae | 7251 |
| Syngnathus lumbriciformis Jenyns, 1835 | Nerophis lumbriciformis | 4509 |
| Idiotropiscis lumnitzeri Kuiter, 2004 | Idiotropiscis lumnitzeri | 54742 |
| Bombonia luzonica Herre, 1927 | Hippichthys heptagonus | 94476 |
| Doryrhamphus macgregori Jordan & Richardson, 1908 | Choeroichthys sculptus | 5316 |
| Syngnathus macrobrachium Fritzsche, 1980 | Syngnathus macrobrachium | 5316 |
| Syngnathus macrophthalmus Duncker, 1915 | Syngnathus macrophthalmus | 5316 |
| Doryichthys macropterus Poll, 1953 | Microphis aculeatus | 4509 |
| Stigmatopora macropterygia Duméril, 1870 | Stigmatopora macropterygia | 5316 |
| Halicampus macrorhynchus Bamber, 1915 | Halicampus macrorhynchus | 5316 |
| Histiogamphelus maculatus Hale, 1939 | Histiogamphelus cristatus | 5316 |
| Ichthyocampus maculatus Alleyne & Macleay, 1877 | Trachyrhamphus bicoarctatus | 5316 |
| Nerophis maculatus Rafinesque, 1810 | Nerophis maculatus | 6733 |
| Histiogamphelus maculatus robensis Whitley, 1948 | Histiogamphelus briggsii | 5316 |
| Hippocampus manadensis Bleeker, 1856 | Hippocampus trimaculatus | 30915 |
| Syngnathus manadensis Bleeker, 1856 | Microphis manadensis | 5316 |
| Hippocampus mannulus Cantor, 1849 | Hippocampus trimaculatus | 30915 |
| Syngnathus margaritifer Peters, 1868 | Vanacampus margaritifer | 5316 |
| Hippocampus marginalis Kaup, 1856 | Hippocampus erectus | 30915 |
| Halicampus marquesensis Dawson, 1984 | Halicampus marquesensis | 5316 |
| Syngnathus martensii Peters, 1868 | Doryichthys martensii | 5316 |
| Corythoichthys mataafae Jordan & Seale, 1906 | Halicampus mataafae | 33390 |
| Corythroichthys matterni Fowler, 1918 | Hippichthys heptagonus | 5316 |
| Syngnathus maxweberi Whitley, 1933 | Cosmocampus maxweberi | 26282 |
| Microphis mayottae Fourmanoir, 1955 | Doryrhamphus excisus | 5373 |
| Syngnathus melanopleura Bleeker, 1858 | Doryrhamphus melanopleura | 127687 |
| Doryrhamphus melanopleura cooki Weed & Woods, 1953 | Doryrhamphus melanopleura | 127687 |
| Doryrhamphus melanopleura japonica Araga & Yoshino, 1975 | Doryrhamphus japonicus | 26282 |
| Hippocampus melanospilos Bleeker, 1854 | Hippocampus kuda | 30915 |
| Syngnathus mento Bleeker, 1856 | Microphis mento | 5316 |
| Histiogamphelus meraculus Whitley, 1948 | Mitotichthys meraculus | 5316 |
| Syngnathus microchirus Moreau, 1891 | Syngnathus abaster | 13696 |
| Syngnathus micronotopterus Fowler, 1938 | Micrognathus micronotopterus | 5316 |
| Doryichthys millepunctatus Kaup, 1856 | Microphis millepunctatus | 5316 |
| Syngnathus mindii Meek & Hildebrand, 1923 | Pseudophallus mindii | 30499 |
| Hippocampus minotaur Gomon, 1997 | Hippocampus minotaur | 30915 |
| Syngnathus modestus Sauvage, 1879 | Vanacampus poecilolaemus | 5316 |
| Hippocampus mohnikei (non Bleeker, 1853) | Hippocampus coronatus | 559 |
| Hippocampus mohnikei Bleeker, 1853 | Hippocampus mohnikei | 30915 |
| Hippocampus mohnikei (non Bleeker, 1853) | Hippocampus sindonis | 30915 |
| Syngnathus mollisoni Scott, 1955 | Mitotichthys mollisoni | 7300 |
| Hippocampus moluccensis Bleeker, 1852 | Hippocampus kuda | 30915 |
| Hippocampus montebelloensis Kuiter, 2001 | Hippocampus montebelloensis | 42735 |
| Acentronura mossambica Smith, 1963 | Acentronura tentaculata | 4281 |
| Syngnathus mossambicus Peters, 1855 | Hippichthys cyanospilos | 5316 |
| Doryichthys multiannulatus Regan, 1903 | Dunckerocampus multiannulatus | 5316 |
| Hippocampus multispinus Kuiter, 2001 | Hippocampus angustus | 115213 |
| Micrognathus myersi Herald & Randall, 1972 | Minyichthys myersi | 5316 |
| Dunckerocampus naia Allen & Kuiter, 2004 | Dunckerocampus naia | 77036 |
| Hippocampus nalu Short, Claassens, Smith, de Brauwer, Hamilton, Stat & Harasti, 2020 | Hippocampus nalu | 122372 |
| Campichthys nanus Dawson, 1977 | Campichthys nanus | 5316 |
| Nannocampus nanus Rosén, 1911 | Penetopteryx nanus | 26282 |
| Urocampus nanus Günther, 1870 | Urocampus nanus | 5316 |
| Stigmatopora narinosa Browne & Smith, 2007 | Stigmatopora narinosa | 75062 |
| Hippocampus natalensis von Bonde, 1923 | Hippocampus fuscus | 30915 |
| Micrognathus natans Dawson, 1982 | Micrognathus natans | 5316 |
| Doryrhamphus negrosensis Herre, 1934 | Doryrhamphus negrosensis | 36648 |
| Stigmatopora nigra Kaup, 1856 | Stigmatopora nigra | 5316 |
| Corythoichthys nigripectus Herald, 1953 | Corythoichthys nigripectus | 1602 |
| Siokunichthys nigrolineatus Dawson, 1983 | Siokunichthys nigrolineatus | 5173 |
| Syngnathus nigrolineatus Eichwald, 1831 | Syngnathus abaster | 13696 |
| Syngnathus nigrolineatus maeoticus Slastenenko, 1938 | Syngnathus abaster | 13696 |
| Syngnathus nitidus Günther, 1873 | Halicampus nitidus | 26282 |
| Heraldia nocturna Paxton, 1975 | Heraldia nocturna | 5316 |
| Syngnathus norae Waite, 1910 | Leptonotus norae | 5316 |
| Hippocampus novaehebudorum Fowler, 1944 | Hippocampus kuda | 30915 |
| Hippocampus novaehollandiae Steindachner, 1866 | Hippocampus whitei | 7300 |
| Hippocampus novaehollandiae (non Steindachner, 1866) | Hippocampus tristis | 123057 |
| Ichthyocampus nox Snyder, 1909 | Phoxocampus belcheri | 5316 |
| Bhanotia nuda Dawson, 1978 | Bhanotia nuda | 5316 |
| Hippocampus obscurus Ehrenberg, 1871 | Hippocampus fuscus | 2198 |
| Hippocampus obscurus Hemprich & Ehrenberg, 1856 | Hippocampus fuscus | 30915 |
| Hippocampus obtusus Ginsburg, 1933 | Hippocampus reidi | 30915 |
| Corythoichthys ocellatus Herald, 1953 | Corythoichthys ocellatus | 1602 |
| Doryichthys ocellatus Duncker, 1910 | Lophocampus ocellatus | 5316 |
| Microphis ocellatus Snyder, 1909 | Choeroichthys sculptus | 5316 |
| Stigmatophora olivacea Castelnau, 1872 | Stigmatopora argus | 5316 |
| Syngnathus olssoni Johnels, 1954 | Enneacampus ansorgii | 7369 |
| Syngnathus ophidion Linnaeus, 1758 | Nerophis ophidion | 4509 |
| Syngnathus papacinus Risso, 1810 | Nerophis maculatus | 7501 |
| Ichthyocampus papuensis Sauvage, 1880 | Corythoichthys haematopterus | 5316 |
| Hippocampus paradoxus Foster & Gomon, 2010 | Hippocampus paradoxus | 85152 |
| Syngnathus parvicarinatus Dawson, 1978 | Hippichthys parvicarinatus | 5316 |
| Syngnathus parviceps Ramsay & Ogilby, 1886 | Hippichthys heptagonus | 5316 |
| Hippocampus patagonicus Piacentino & Luzzatto, 2004 | Hippocampus patagonicus | 56787 |
| Bhanotia pauciradiata Allen & Kuiter, 1995 | Bhanotia pauciradiata | 31114 |
| Doryrhamphus paulus Fritzsche, 1980 | Doryrhamphus paulus | 123687 |
| Corythoichthys paxtoni Dawson, 1977 | Corythoichthys paxtoni | 11897 |
| Syngnathus pelagicus (non Linnaeus, 1758) | Penetopteryx taeniocephalus | 33390 |
| Syngnathus pelagicus Linnaeus, 1758 | Syngnathus pelagicus | 7251 |
| Syngnathus pelagicus Risso, 1810 | Syngnathus typhle | 13696 |
| Syngnathus penicillus Cantor, 1849 | Hippichthys penicillus | 26282 |
| Syngnathus perlatus Lay & Bennett, 1839 | Hippichthys spicifer | 5316 |
| Maroubra perserrata Whitley, 1948 | Maroubra perserrata | 5316 |
| Dunckerocampus pessuliferus Fowler, 1938 | Dunckerocampus pessuliferus | 90102 |
| Hemithylacus petersii Duméril, 1870 | Leptonotus blainvilleanus | 5316 |
| Doryichthys philippinus Fowler, 1918 | Microphis brachyurus | 5316 |
| Ichthyocampus philippinus Fowler, 1938 | Festucalex erythraeus | 5316 |
| Syngnathus phillipi Lucas, 1891 | Vanacampus phillipi | 5316 |
| Syngnathus phlegon Risso, 1827 | Syngnathus phlegon | 6733 |
| Ichthyocampus pictus Duncker, 1915 | Nannocampus pictus | 7300 |
| Hippocampus planifrons Peters, 1877 | Hippocampus planifrons | 115213 |
| Syngnathus platyrhynchus Duméril, 1870 | Microphis argulus | 5316 |
| Microphis pleurostictus Peters, 1868 | Microphis pleurostictus | 5316 |
| Doryichthys pleurotaenia Günther, 1880 | Doryrhamphus melanopleura | 127687 |
| Syngnathus poecilolaemus Peters, 1868 | Vanacampus poecilolaemus | 5316 |
| Hippocampus poeyi Howell Rivero, 1934 | Hippocampus reidi | 30915 |
| Syngnathus polyacanthus Bleeker, 1856 | Microphis brachyurus | 5316 |
| Corythoichthys polynotatus Dawson, 1977 | Corythoichthys polynotatus | 1602 |
| Solegnathus polyprion Bleeker, 1853 | Solegnathus hardwickii | 33390 |
| Hippocampus polytaenia Bleeker, 1854 | Hippocampus kuda | 30915 |
| Ichthyocampus ponticerianus Kaup, 1856 | Ichthyocampus carce | 5316 |
| Syngnathus ponticus Pallas, 1814 | Syngnathus typhle | 13696 |
| Hippocampus pontohi Lourie & Kuiter, 2008 | Hippocampus pontohi | 79848 |
| Doryichthys pristipeltis Kaup, 1856 | Microphis brachyurus | 5316 |
| Hippocampus procerus Kuiter, 2001 | Hippocampus whitei | 125503 |
| Corythoichthys profundus Herald, 1965 | Cosmocampus profundus | 12965 |
| Festucalex prolixus Dawson, 1984 | Festucalex prolixus | 5316 |
| Syngnathus pulchellus Boulenger, 1915 | Enneacampus ansorgii | 4127 |
| Syngnathus pulchellus (non Boulenger, 1915) | Microphis aculeatus | 4127 |
| Corythroichthys pullus Smith & Seale, 1906 | Hippichthys heptagonus | 4127 |
| Yozia punctata Kamohara, 1952 | Halicampus punctatus | 5316 |
| Dermatostethus punctipinnis Gill, 1862 | Syngnathus acus | 82598 |
| Hippocampus punctulatus Guichenot, 1853 | Hippocampus erectus | 30915 |
| Hippocampus punctulatus (non Guichenot, 1853) | Hippocampus hippocampus | 30915 |
| Hippocampus punctulatus Kaup, 1856 | Hippocampus algiricus | 30915 |
| Hippocampus pusillus Fricke, 2004 | Hippocampus pusillus | 75989 |
| Micrognathus pygmaeus Fritzsche, 1981 | Micrognathus pygmaeus | 90102 |
| Syngnathus pyrois Risso, 1827 | Syngnathus typhle | 13696 |
| Hippocampus queenslandicus Horne, 2001 | Hippocampus spinosissimus | 115213 |
| Corythroichthys quinquarius Snyder, 1911 | Hippichthys penicillus | 5316 |
| Hippocampus raji Whitley, 1955 | Hippocampus kuda | 30915 |
| Hippocampus ramulosus (non Leach, 1814) | Hippocampus histrix | 33390 |
| Hippocampus ramulosus Leach, 1814 | Hippocampus guttulatus | 30915 |
| Syngnathus randalli Herald, 1965 | Bryx randalli | 36656 |
| Hippocampus regulus Ginsburg, 1933 | Hippocampus zosterae | 30915 |
| Hippocampus reidi Ginsburg, 1933 | Hippocampus reidi | 30915 |
| Cosmocampus retropinnis Dawson, 1982 | Cosmocampus retropinnis | 4509 |
| Syngnathus retzii Bleeker, 1856 | Lophocampus retzii | 5316 |
| Doryichthys retzii albadorsum Fowler, 1944 | Lophocampus retzii | 5316 |
| Hippocampus rhynchomacer Duméril, 1870 | Hippocampus kuda | 30915 |
| Solegnathus robustus McCulloch, 1911 | Solegnathus robustus | 5316 |
| Hemithylacus rocaberti Duméril, 1870 | Microphis mento | 5316 |
| Syngnathus rondeletii Delaroche, 1809 | Syngnathus typhle | 13696 |
| Hippocampus rosamondae Borodin, 1928 | Hippocampus zosterae | 30915 |
| Syngnathus rostellatus Nilsson, 1855 | Syngnathus rostellatus | 6733 |
| Histiogamphelus rostratus Waite & Hale, 1921 | Hypselognathus rostratus | 5316 |
| Syngnathus rotundatus Michahelles, 1829 | Syngnathus typhle | 13696 |
| Syngnathus rousseau Kaup, 1856 | Syngnathus pelagicus | 54621 |
| Nannocampus ruber Ramsay & Ogilby, 1886 | Notiocampus ruber | 5316 |
| Syngnathus rubescens Risso, 1810 | Syngnathus acus | 13696 |
| Festucalex rufus Allen & Erdmann, 2015 | Festucalex rufus | 116662 |
| Kyonemichthys rumengani Gomon, 2007 | Kyonemichthys rumengani | 75145 |
| Festucalex runa Whitley, 1931 | Lissocampus runa | 5316 |
| Syngnathus safina Paulus, 1992 | Syngnathus safina | 46206 |
| Belonichthys sanctipauli Sauvage, 1879 | Microphis fluviatilis | 4127 |
| Hippocampus satomiae Lourie & Kuiter, 2008 | Hippocampus satomiae | 79848 |
| Corythoichthys sauvagei Whitley, 1929 | Vanacampus poecilolaemus | 5316 |
| Ichthyocampus scalaris Günther, 1870 | Festucalex scalaris | 5316 |
| Syngnathus schlegeli Kaup, 1856 | Syngnathus schlegeli | 5316 |
| Paramicrophis schmidti Klausewitz, 1955 | Microphis cuncalus | 4833 |
| Syngnathus schmidti Popov, 1928 | Syngnathus schmidti | 6733 |
| Corythoichthys schultzi Herald, 1953 | Corythoichthys schultzi | 1602 |
| Siphostoma scovelli Evermann & Kendall, 1896 | Syngnathus scovelli | 79722 |
| Syngnathus scovelli makaxi Herald & Dawson, 1972 | Syngnathus makaxi | 41258 |
| Doryichthys sculptus Günther, 1870 | Choeroichthys sculptus | 5316 |
| Corythoichthys sealei Jordan & Starks, 1906 | Corythoichthys flavofasciatus | 5316 |
| Syngnathus semifasciatus Günther, 1870 | Mitotichthys semistriatus | 5316 |
| Hippocampus semispinosus Kuiter, 2001 | Hippocampus spinosissimus | 115213 |
| Leptonotus semistriatus Kaup, 1856 | Mitotichthys semistriatus | 5316 |
| Minyichthys sentus Dawson, 1982 | Minyichthys sentus | 4509 |
| Doryichthys serialis Günther, 1884 | Choeroichthys brachysoma | 5316 |
| Syngnathus serratus Temminck & Schlegel, 1850 | Trachyrhamphus serratus | 5316 |
| Corythoichthys serrulifer Fowler, 1938 | Corythoichthys flavofasciatus | 5316 |
| Hippocampus severnsi Lourie & Kuiter, 2008 | Hippocampus pontohi | 118476 |
| Bhanotia sewelli Hora, 1926 | Bhanotia fasciolata | 5380 |
| Doryrhamphus sierra Nichols, 1915 | Microphis lineatus | 79722 |
| Siphostoma sinaloae Jordan & Starks, 1896 | Syngnathus auliscus | 5316 |
| Hippocampus sindonis Jordan & Snyder, 1901 | Hippocampus sindonis | 559 |
| Choeroichthys smithi Dawson, 1976 | Choeroichthys smithi | 4281 |
| Microphis smithii Duméril, 1870 | Microphis aculeatus | 4127 |
| Urocampus southwelli Duncker, 1910 | Siokunichthys southwelli | 5173 |
| Doryichthys spaniaspis Jordan & Seale, 1907 | Hippichthys cyanospilos | 5316 |
| Syngnathus spicifer Rüppell, 1838 | Hippichthys spicifer | 5316 |
| Syngnathus spicifer (non Rüppell, 1838) | Enneacampus kaupi | 4127 |
| Syngnathus spicifer djarong Bleeker, 1853 | Hippichthys heptagonus | 4127 |
| Syngnathus spicifer gastrotaenia Bleeker, 1853 | Hippichthys spicifer | 4127 |
| Syngnathus spicifer rivalis Peters, 1868 | Hippichthys heptagonus | 94476 |
| Doryichthys spinachioides Duncker, 1915 | Microphis spinachioides | 26282 |
| Micrognathus spinirostris Dawson & Allen, 1981 | Halicampus spinirostris | 5316 |
| Hippocampus spinosissimus Weber, 1913 | Hippocampus spinosissimus | 7300 |
| Solenognathus spinosissimus Günther, 1870 | Solegnathus spinosissimus | 26282 |
| Doryichthys spinosus Kaup, 1856 | Doryichthys boaja | 5316 |
| Syngnathus springeri Herald, 1942 | Syngnathus springeri | 7251 |
| Siphostoma starksii Jordan & Culver, 1895 | Pseudophallus starksii | 5316 |
| Doryichthys stictorhynchus Ogilby, 1912 | Microphis manadensis | 5316 |
| Siokunichthys striatus Fricke, 2004 | Siokunichthys striatus | 75989 |
| Hippocampus stylifer Jordan & Gilbert, 1882 | Hippocampus erectus | 30915 |
| Hippocampus subcoronatus Günther, 1866 | Hippocampus camelopardalis | 30915 |
| Hippocampus subelongatus Castelnau, 1873 | Hippocampus subelongatus | 30915 |
| Nannocampus subosseus Günther, 1870 | Nannocampus subosseus | 5316 |
| Hippocampus suezensis Duncker, 1940 | Hippocampus suezensis | 93157 |
| Choeroichthys suillus Whitley, 1951 | Choeroichthys suillus | 5316 |
| Choeroichthys suillus (non Whitley, 1951) | Choeroichthys smithi | 4281 |
| Choeroichthys suillus malus Whitley, 1954 | Doryrhamphus malus | 86771 |
| Syngnathus superciliaris Günther, 1880 | Filicampus tigris | 5316 |
| Micrognathus suvensis Herre, 1935 | Hippichthys spicifer | 5316 |
| Penetopteryx taeniocephalus Lunel, 1881 | Penetopteryx taeniocephalus | 5316 |
| Syngnatus taeniolatus Lacepède, 1804 | Phyllopteryx taeniolatus | 26282 |
| Syngnathus taenionotus Canestrini, 1871 | Syngnathus taenionotus | 13696 |
| Haliichthys taeniophorus Gray, 1859 | Haliichthys taeniophorus | 5316 |
| Hippocampus taeniops Fowler, 1904 | Hippocampus kuda | 30915 |
| Hippocampus taeniopterus Bleeker, 1852 | Hippocampus kuda | 30915 |
| Hippocampus takakurae Tanaka, 1916 | Hippocampus trimaculatus | 30915 |
| Syngnathus tapeinosoma Bleeker, 1854 | Hippichthys spicifer | 5316 |
| Micrognathus tectus Dawson, 1978 | Anarchopterus tectus | 3814 |
| Syngnathus temminckii Kaup, 1856 | Syngnathus temminckii | 119010 |
| Acentronura tentaculata Günther, 1870 | Acentronura tentaculata | 4281 |
| Syngnathus tenuirostris Rathke, 1837 | Syngnathus tenuirostris | 6733 |
| Microphis tenuis Blyth, 1858 | Hippichthys spicifer | 4833 |
| Scyphicus teres Rathke, 1837 | Nerophis ophidion | 13696 |
| Syngnathus tetragonous Mitchill, 1814 | Hippocampus erectus | 80565 |
| Syngnathus tetragonus Thunberg, 1776 | Syngnathoides biaculeatus | 5316 |
| Syngnathus tetrophthalmus Bleeker, 1858 | Phoxocampus tetrophthalmus | 26282 |
| Syngnathus tigris Castelnau, 1879 | Filicampus tigris | 5316 |
| Siphostoma torrei Nichols, 1912 | Microphis lineatus | 13286 |
| Microphis torrentius Jordan & Seale, 1906 | Lophocampus retzii | 5316 |
| Ichthyocampus townsendi Duncker, 1915 | Festucalex erythraeus | |
| Syngnathus trachypoma Günther, 1884 | Halicampus grayi | 5316 |
| Campichthys tricarinatus Dawson, 1977 | Campichthys tricarinatus | 5316 |
| Hippocampus trimaculatus Leach, 1814 | Hippocampus trimaculatus | 4281 |
| Hippocampus tristis Castelnau, 1872 | Hippocampus tristis | 123057 |
| Leptonotus tristriatus Fowler, 1922 | Mitotichthys semistriatus | 5316 |
| Ichthyocampus tryoni Ogilby, 1890 | Campichthys tryoni | 5316 |
| Campichthys tryoni lindemanensis Whitley, 1948 | Nannocampus pictus | 7300 |
| Campichthys tryoni lindemanensis Whitley, 1948 | Nannocampus lindemanensis | 75154 |
| Hippocampus tuberculatus Castelnau, 1875 | Hippocampus breviceps | 7300 |
| Syngnathus tuckeri Scott, 1942 | Mitotichthys tuckeri | 5316 |
| Cylix tupareomanaia Short, Trnski & Ngātiwai, 2021 | Cylix tupareomanaia | 125308 |
| Syngnathus tweedlei Meek & Hildebrand, 1923 | Syngnathus auliscus | 5316 |
| Syngnathus typhle Linnaeus, 1758 | Syngnathus typhle | 13696 |
| Hippocampus tyro Randall & Lourie, 2009 | Hippocampus tyro | 82040 |
| Syngnathus uncinatus Weber, 1913 | Bhanotia fasciolata | 5316 |
| Stigmatophora unicolor Castelnau, 1875 | Syngnathoides biaculeatus | 5316 |
| Bombonia uxorius Herre, 1935 | Hippichthys heptagonus | 5316 |
| Coelonotus vaillantii Juillerat, 1880 | Microphis leiaspis | 5316 |
| Choeroichthys valencienni Kaup, 1856 | Choeroichthys brachysoma | 5316 |
| Choeroichthys valencienni (non Kaup, 1856) | Choeroichthys smithi | 4281 |
| Syngnathus variegatus Pallas, 1814 | Syngnathus variegatus | 6733 |
| Bryx veleronis Herald, 1940 | Bryx veleronis | 5316 |
| Syngnathus vercoi Waite & Hale, 1921 | Vanacampus vercoi | 5316 |
| Syngnathus verreauxianus Duméril, 1870 | Mitotichthys semistriatus | 5316 |
| Hippocampus villosus Günther, 1880 | Hippocampus erectus | 30915 |
| Scyphius violaceus Risso, 1827 | Nerophis ophidion | 13696 |
| Syngnathus viridis Risso, 1810 | Syngnathus typhle | 13696 |
| Corythoichthys vittatus Kaup, 1856 | Micrognathus crinitus | 7436 |
| Hippocampus vulgaris Cloquet, 1821 | Hippocampus hippocampus | 30915 |
| Corythoichthys waitei Jordan & Seale, 1906 | Corythoichthys intestinalis | 5316 |
| Yozia wakanourae Jordan & Snyder, 1901 | Trachyrhamphus bicoarctatus | 5316 |
| Hippocampus waleananus Gomon & Kuiter, 2009 | Hippocampus waleananus | 118476 |
| Parasyngnathus wardi Whitley, 1948 | Hippichthys cyanospilos | 5316 |
| Festucalex wassi Dawson, 1977 | Festucalex wassi | 5316 |
| Syngnathus watermeyeri Smith, 1963 | Syngnathus watermeyeri | 4281 |
| Nannocampus weberi Duncker, 1915 | Nannocampus weberi | 5316 |
| Hippocampus whitei (non Bleeker, 1855) | Hippocampus spinosissimus | 42735 |
| Hippocampus whitei Bleeker, 1855 | Hippocampus whitei | 30915 |
| Hippocampus whitei (non Bleeker, 1855) | Hippocampus tristis | 123057 |
| Maroubra yasudai Dawson, 1983 | Maroubra yasudai | 559 |
| Siphostoma yoshi Snyder, 1909 | Microphis leiaspis | 5316 |
| Syngnathus zambezensis Peters, 1855 | Microphis fluviatilis | 4281 |
| Syngnathus zanzibarensis Günther, 1867 | Trachyrhamphus bicoarctatus | 5316 |
| Halicampus zavorensis Dawson, 1984 | Halicampus zavorensis | 4281 |
| Hippocampus zebra Whitley, 1964 | Hippocampus zebra | 30915 |
| Syngnathus zonatus Károli, 1882 | Doryichthys boaja | 5316 |
| Hippocampus zosterae Jordan & Gilbert, 1882 | Hippocampus zosterae | 30915 |