After Carroll, 1988, and Nelson, 1994, with Recent species from Froese & Pauly, 2001 [“The Fishbase”]

<==o Syngnathidae (merineulat) [52/215] [FB: 53/249]
   |-- †Calamostoma breviculum M. Eoc. Eu.
   |-- †Hipposyngnathus Mioc. Eu. 
   |-- †Pseudosyngnathus opisthopterus M. Eoc. Eu. 
   |--o Hippocampinae (seahorses; merihevoset) [1/25]
   |  `-- Hippocampus (seahorses; merihevoset) [Nelson: 25] [Fishbase: 32]
   `--o Syngnathinae (merineulat) [Nelson: 51/190] [Fishbase: ]
      |--o Acanthonura [Amphelikturus] [5]
      |  |-- A. australe Waite & Hale, 1921 (Southern little pipehorse)
      |  |-- A. dendritica (Barbour, 1905) Pipehorse
      |  |-- A. gracilissima (Temminck & Schlegel, 1850) (Bastard seahorse)
      |  |-- A. larsonae Dawson, 1984
      |  `-- A. tentaculata Günther, 1870
      |--o Anarchopterus [2]
      |  |-- A. criniger (Bean & Dresel, 1884) (Fringed pipefish)
      |  `-- A. tectus (Dawson, 1978) (Insular pipefish)
      |?- Apterygocampus epinnulatus Weber, 1913
      |?-o Bhanotia [2]
      |  |-- B. fasciolata (Duméril, 1870)
      |  `-- B. nuda Dawson, 1978 (Naked pipefish)
      |--o Bryx [4]
      |  |-- B. analicarens (Duncker, 1915) Pink pipefish
      |  |-- B. dunckeri (Metzelaar, 1919) Pugnose pipefish
      |  |-- B. randalli (Herald, 1965)
      |  `-- B. veleronis Herald, 1940
      |--o Bulbonaricus [Enchelyocampus] [3]
      |  |-- B. brauni (Dawson & Allen, 1978) (Pugheaded pipefish)
      |  |-- B. brucei Dawson, 1984
      |  `-- B. davaoensis (Herald, 1953)
      |--o Campichthys [4]
      |  |-- C. galei (Duncker, 1909) (Gale's pipefish)
      |  |-- C. nanus Dawson, 1977
      |  |-- C. tricarinatus Dawson, 1977
      |  `-- C. tryoni (Ogilby, 1890) (Tryon's pipefish)
      |--o Choeroichthys [6]
      |  |-- C. brachysoma (Bleeker, 1855) (Short-bodied pipefish)
      |  |-- C. cinctus Dawson, 1976
      |  |-- C. latispinosus Dawson, 1978
      |  |-- C. sculptus (Günther, 1870) (Sculptured pipefish)
      |  |-- C. smithi Dawson, 1976
      |  `-- C. suillus Whitley, 1951 (Pig-snouted pipefish)
      |--o Corythoichthys [10]
      |  |-- C. amplexus Dawson & Randall, 1975 (Brown-banded pipefish)
      |  |-- C. flavofasciatus (Rüppell, 1838) (Network pipefish)
      |  |-- C. haematopterus (Bleeker, 1851) (Messmate pipefish)
      |  |-- C. insularis Dawson, 1977
      |  |-- C. intestinalis (Ramsay, 1881) (Scribbled pipefish)
      |  |-- C. nigripectus Herald, 1953 (Black-breasted pipefish)
      |  |-- C. ocellatus Herald, 1953 (Ocellated pipefish)
      |  |-- C. paxtoni Dawson, 1977
      |  |-- C. polynotatus Dawson, 1977 (Many-spotted pipefish)
      |  `-- C. schultzi Herald, 1953 (Schultz's pipefish)
      |--o Cosmocampus [13]
      |  |-- C. albirostris (Kaup, 1856) (Whitenose pipefish)
      |  |--o C. arctus (Jenkins & Evermann, 1889)
      |  |  |-- C. a. arctus (Jenkins & Evermann, 1889) (Snubnose pipefish)
      |  |  |-- C. a. coccineus (Herald, 1940)
      |  |  `-- C. a. heraldi (Fritzsche, 1980)
      |  |-- C. balli (Fowler, 1925) (Ball's pipe fish)
      |  |-- C. banneri (Herald & Randall, 1972) (Roughridge pipefish)
      |  |-- C. brachycephalus (Poey, 1868) (Crested pipefish)
      |  |-- C. darrosanus (Dawson & Randall, 1975) (D'Arros pipefish)
      |  |-- C. elucens (Poey, 1868) (Shortfin pipefish)
      |  |-- C. hildebrandi (Herald, 1965) (Dwarf pipefish)
      |  |-- C. howensis (Whitley, 1948)
      |  |-- C. investigatoris (Hora, 1926)
      |  |-- C. maxweberi (Whitley, 1933) (Maxweber's pipefish)
      |  |-- C. profundus (Herald, 1965) (Deepwater pipefish)
      |  `-- C. retropinnis Dawson, 1982
      |--o Doryichthys [5]
      |  |-- D. boaja (Bleeker, 1851) (Long-snouted pipefish)
      |  |-- D. contiguus Kottelat, 2000
      |  |-- D. deokhatoides (Bleeker, 1853)
      |  |-- D. heterosoma (Bleeker, 1851)
      |  `-- D. martensii (Peters, 1868)
      |--o Doryrhamphus [10]
      |  |-- D. aurolineatus Randall & Earle, 1994
      |  |-- D. baldwini (Herald & Randall, 1972) (Redstripe pipefish)
      |  |-- D. bicarinatus Dawson, 1981 (Narrowstripe pipefish)
      |  |-- D. chapmani (Herald, 1953)
      |  |-- D. dactyliophorus (Bleeker, 1853) (Ringed pipefish)
      |  |--o D. excisus Kaup, 1856
      |  |  |-- D. e. abbreviatus Dawson, 1981
      |  |  |-- D. e. excisus Kaup, 1856 (Bluestripe pipefish)
      |  |  `-- D. e. paulus Fritzsche, 1980
      |  |-- D. janssi (Herald & Randall, 1972) (Janss' pipefish)
      |  |-- D. japonicus Araga & Yoshino, 1975
      |  |-- D. multiannulatus (Regan, 1903) (Many-banded pipefish)
      |  |--o D. negrosensis Herre, 1934
      |  |  |-- D. n. malus (Whitley, 1954) (Masthead Island pipefish)
      |  |  `-- D. n. negrosensis Herre, 1934 (Negros pipefish)
      |  `-- D. pessuliferus (Fowler, 1938)
      |--o Dunckerocampus [Acanthognathus] Olig. Mioc. Eu. R. Oc. [1 Recent species] 
      |  `-- D. boylei Kuiter, 1998 (Broad-banded Pipefish)
      |--o Enneacampus [2]
      |  |-- E. ansorgii (Boulenger, 1910)
      |  `-- E. kaupi (Bleeker, 1863)
      |?- Entelurus aequoreus (Linnaeus, 1758) (Snake pipefish)
      |--o Festucalex [6]
      |  |-- F. cinctus (Ramsay, 1882) (Girdled pipefish)
      |  |-- F. erythraeus (Gilbert, 1905)
      |  |-- F. gibbsi Dawson, 1977
      |  |-- F. prolixus Dawson, 1984
      |  |-- F. scalaris (Günther, 1870) (Ladder pipefish)
      |  `-- F. wassi Dawson, 1977
      |?- Filicampus tigris (Castelnau, 1879) (Tiger pipefish)
      |--o Halicampus [12]
      |  |-- H. boothae (Whitley, 1964) (Booth;s pipefish)
      |  |-- H. brocki (Herald, 1953) (Brock's pipefish)
      |  |-- H. dunckeri (Chabanaud, 1929) (Duncker's pipefish)
      |  |-- H. edmondsoni (Pietschmann, 1928) (Edmondson's pipefish)
      |  |-- H. grayi Kaup, 1856 (Gray's pipefish)
      |  |-- H. macrorhynchus Bamber, 1915 (Ornate pipefish)
      |  |-- H. marquesensis Dawson, 1984
      |  |-- H. mataafae (Jordan & Seale, 1906) (Samoan pipefish)
      |  |-- H. nitidus (Günther, 1873) (Glittering pipefish)
      |  |-- H. punctatus (Kamohara, 1952) (Starry pipefish)
      |  |-- H. spinirostris (Dawson & Allen, 1981)
      |  `-- H. zavorensis Dawson, 1984 (Zavora pipefish)
      |?- Haliichthys taeniophorus Gray, 1859 (Ribboned pipefish)
      |-- Heraldia nocturna Paxton, 1975
      |--o Hippichthys [Bombonia] [5]
      |  |-- H. cyanospilus (Bleeker, 1854) (Blue-spotted pipefish)
      |  |-- H. heptagonus Bleeker, 1849 (Belly pipefish)
      |  |-- H. parvicarinatus (Dawson, 1978)
      |  |-- H. penicillus (Cantor, 1849) (Beady pipefish)
      |  `-- H. spicifer (Rüppell, 1838) (Bellybarred pipefish)
      |?-o Histiogamphelus [2]
      |  |-- H. briggsii McCulloch, 1914 (Briggs' pipefish)
      |  `-- H. cristatus (Macleay, 1881) (Macleay's crested pipefish)
      |?-o Hypselognathus
      |  |-- H. horridus Dawson & Glover, 1982 (Prickly pipefish)
      |  `-- H. rostratus (Waite & Hale, 1921) (Knife-snouted pipefish)
      |?- Ichthyocampus carce (Hamilton, 1822) (Freshwater pipefish)
      |?- Kaupus costatus (Waite & Hale, 1921)
      |?- Kimblaeus bassensis Dawson, 1980 (Trawl pipefish)
      |?- Leptoichthys fistularius Kaup, 1853 (Brush-tailed pipefish)
      |--o Leptonotus [3]
      |  |-- L. blainvilleanus (Eydoux & Gervais, 1837) (Deep-bodied pipefish)
      |  |-- L. elevatus (Hutton, 1872) (Pipefish)
      |  `-- L. norae (Waite, 1910) (Longsnout pipefish)
      |--o Lissocampus [5]
      |  |-- L. bannwarthi (Duncker, 1915)
      |  |-- L. caudalis Waite & Hale, 1921 (Smooth pipefish)
      |  |-- L. fatiloquus (Whitley, 1943) (Prophet's pipefish)
      |  |-- L. filum (Günther, 1870) (Shortsnout pipefish)
      |  `-- L. runa (Whitley, 1931) (Javelin pipefish)
      |?-o Maroubra [2]
      |  |-- M. perserrata Whitley, 1948 (Sawtooth pipefish)
      |  `-- M. yasudai Dawson, 1983 (Orange pipefish)
      |--o Micrognathus [8]
      |  |-- M. andersonii (Bleeker, 1858) (Shortnose pipefish)
      |  |--o M. brevirostris (Rüppell, 1838)
      |  |  |-- M. b. brevirostris (Rüppell, 1838)
      |  |  `-- M. b. pygmaeus Fritzsche, 1981 (Thorntailed pipefish)
      |  |-- M. crinitus (Jenyns, 1842) (Banded pipefish)
      |  |-- M. ensenadae (Silvester, 1915) (Harlequin pipefish)
      |  |-- M. erugatus Herald & Dawson, 1974
      |  |-- M. micronotopterus (Fowler, 1938)
      |  |-- M. natans Dawson, 1982
      |  `-- M. vittatus (Kaup, 1856)
      |-- Microphis [Oostethus] [18]
      |?-o Minyichthys [3]
      |  |-- M. brachyrhinus (Herald, 1953)
      |  |-- M. myersi (Herald & Randall, 1972) (Myer's pipefish)
      |  `-- M. sentus Dawson, 1982
      |?-o Mitotichthys [4]
      |  |-- M. meraculus (Whitley, 1948) (Western crested pipefish)
      |  |-- M. mollisoni (Scott, 1955) (Mollison's pipefish)
      |  |-- M. semistriatus (Kaup, 1856) (Half-banded pipefish)
      |  `-- M. tuckeri (Scott, 1942) (Tucker's pipefish)
      |--o Nannocampus [4]
      |  |-- N. elegans Smith, 1961 (Elegant pipefish)
      |  |-- N. pictus (Duncker, 1915) (Reef pipefish)
      |  |-- N. subosseus Günther, 1870 (Bony-headed pipefish)
      |  `-- N. weberi Duncker, 1915
      |--o Nerophis [3]
      |  |-- N. lumbriciformis (Jenyns, 1835) (Worm pipefish)
      |  |-- N. maculatus Rafinesque, 1810
      |  `-- N. ophidion (Linnaeus, 1758) (siloneula; Straightnose pipefish)
      |?- Notiocampus ruber (Ramsay & Ogilby, 1886) (Red pipefish)
      |--o Penetopteryx [2]
      |  |-- P. nanus (Rosén, 1911) (Lost pipefish)
      |  `-- P. taeniocephalus Lunel, 1881
      |?-o Phoxocampus [3]
      |  |-- P. belcheri (Kaup, 1856) (Rock pipefish)
      |  |-- P. diacanthus (Schultz, 1943) (Spined pipefish)
      |  `-- P. tetrophthalmus (Bleeker, 1858)
      |?- Phycodurus eques (Günther, 1865) (Leafy seadragon)
      |-- Phyllopteryx taeniolatus (Lacépède, 1804) (Common seadragon)
      |?-o Pseudophallus [3]
      |  |-- P. elcapitanensis (Meek & Hildebrand, 1914)
      |  |-- P. mindii (Meek & Hildebrand, 1923)
      |  `-- P. starksii (Jordan & Culver, 1895)
      |?- Pugnaso curtirostris (Castelnau, 1872) (Pug-nosed pipefish)
      |--o Siokunichthys [5]
      |  |-- S. bentuviai Clark, 1966
      |  |-- S. breviceps Smith, 1963
      |  |-- S. herrei Herald, 1953
      |  |-- S. nigrolineatus Dawson, 1983
      |  `-- S. southwelli (Duncker, 1910) (Southwell's pipefish)
      |--o Solegnathus [5]
      |  |-- S. dunckeri Whitley, 1927
      |  |-- S. hardwickii (Gray, 1830) (Hardwicke's pipefish)
      |  |-- S. lettiensis Bleeker, 1860 (Günther's pipehorse)
      |  |-- S. robustus McCulloch, 1911 (Robust pipehorse)
      |  `-- S. spinosissimus (Günther, 1870) (Spiny pipehorse)
      |?-o Stigmatopora [3]
      |  |-- S. argus (Richardson, 1840) (Spotted pipefish)
      |  |-- S. macropterygia Duméril, 1870 (Long-snouted pipefish)
      |  `-- S. nigra Kaup, 1856 (Wide-bodied pipefish)
      |?- Stipecampus cristatus (McCulloch & Waite, 1918) (Ring-backed pipefish)
      |-- Syngnathoides biaculeatus (Bloch, 1785) Alligator pipefish
      |-- Syngnathus [Siphonostoma] M. Eoc. Plioc. Eu. Mioc. NA. Plioc. NAf. R. Oc. [28]
      |?- Siphonostoma typhle (särmäneula)
      |?-o Trachyrhamphus [3]
      |  |-- T. bicoarctatus (Bleeker, 1857) (Double-ended pipefish)
      |  |-- T. longirostris Kaup, 1856
      |  `-- T. serratus (Temminck & Schlegel, 1850)
      |?-o Urocampus [2]
      |  |-- U. carinirostris Castelnau, 1872 (Hairy pipefish)
      |  `-- U. nanus Günther, 1870 (Barbed pipefish)
      `?-o Vanacampus [4]
         |-- V. margaritifer (Peters, 1868) (Mother-of-pearl pipefish)
         |-- V. phillipi (Lucas, 1891) (Port Phillip pipefish)
         |-- V. poecilolaemus (Peters, 1868)
         `-- V. vercoi (Waite & Hale, 1921) (Verco's pipefish)

Reference(s):