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

<==o Platycephalidae (flatheads; lattapäät) [N: 18/60] [FB: 17/67]
   |-- Ambiserrula jugosa (McCulloch, 1914)
   |--o Cociella [5]
   |  |-- C. crocodila (Tilesius, 1812) (Crocodile flathead)
   |  |-- C. heemstrai Knapp, 1996
   |  |-- C. hutchinsi Knapp, 1996
   |  |-- C. punctata (Cuvier, 1829) (Spotted flathead)
   |  `-- C. somaliensis Knapp, 1996
   |--o Cymbacephalus [3]
   |  |-- C. beauforti (Knapp, 1973) Crocodile fish
   |  |-- C. nematophthalmus (Günther, 1860) Fringe-eyed flathead
   |  `-- C. staigeri (Castelnau, 1875)
   |-- Elates ransonnetii (Steindachner, 1876) (Dwarf flathead)
   |--o Eurycephalus [3]
   |  |-- E. arenicola (Schultz, 1966) (Broadhead flathead)
   |  |-- E. carbunculus (Valenciennes, 1833) (Papillose flathead)
   |  `-- E. otaitensis (Parkinson, 1829) (Fringelip flathead)
   |--o Grammoplites [3]
   |  |-- G. knappi Imamura & Amaoka, 1994
   |  |-- G. scaber (Linnaeus, 1758) (Rough flathead)
   |  `-- G. suppositus (Troschel, 1840) (Spotfin flathead)
   |--o Inegocia [3]
   |  |-- I. guttata (Cuvier, 1829)
   |  |-- I. harrisii (McCulloch, 1914) (Harris's flathead)
   |  `-- I. japonica (Tilesius, 1812) (Japanese flathead)
   |-- Kumococius rodericensis (Cuvier, 1829) (Spiny flathead)
   |-- Leviprora inops (Jenyns, 1840)
   |--o Onigocia [5]
   |  |-- O. grandisquama (Regan, 1908)
   |  |-- O. macrolepis (Bleeker, 1854) (Notched flathead)
   |  |-- O. oligolepis (Regan, 1908) (Large-scale flathead)
   |  |-- O. pedimacula (Regan, 1908)
   |  `-- O. spinosa (Temminck & Schlegel, 1844)
   |--o Papilloculiceps [2]
   |  |-- P. bosschei (Bleeker, 1860) (Small-eyed flathead)
   |  `-- P. longiceps (Cuvier, 1829) (Tentacled flathead)
   |--o Platycephalus [16]
   |  |-- P. arenarius Ramsay & Ogilby, 1886 (Northern sand flathead)
   |  |-- P. aurimaculatus Knapp, 1987 (Toothy flathead)
   |  |-- P. bassensis Cuvier, 1829 (Sand flathead)
   |  |-- P. caeruleopunctatus McCulloch, 1922 (Blue-spotted flathead)
   |  |-- P. chauliodous Knapp, 1991
   |  |-- P. conatus Waite & McCulloch, 1915 (Deepwater flathead)
   |  |-- P. cultellatus Richardsoni, 1846
   |  |-- P. endrachtensis Quoy & Gaimard, 1825 (Bar-tailed flathead)
   |  |-- P. fuscus Cuvier, 1829 (Dusky flathead)
   |  |-- P. indicus (Linnaeus, 1758) (Bartail flathead)
   |  |-- P. laevigatus Cuvier, 1829
   |  |-- P. longispinis Macleay, 1884 (Long-spined flathead)
   |  |-- P. marmoratus Stead, 1908
   |  |-- P. micracanthus Sauvage, 1873
   |  |-- P. richardsoni Castelnau, 1872 (Tiger flathead)
   |  `-- P. speculator Klunzinger, 1872 (Yank flathead)
   |--o Ratabulus [2]
   |  |-- R. diversidens (McCulloch, 1914) (Orange-freckled flathead)
   |  `-- R. megacephalus (Tanaka, 1917)
   |--o Rogadius [10]
   |  |-- R. asper (Cuvier, 1829) (Olive-tailed flathead)
   |  |-- R. melanopterus (Knapp & Wongratana, 1987) (Obscure flathead)
   |  |-- R. nigripinnis (Regan, 1905) (Blackfin flathead)
   |  |-- R. patriciae Knapp, 1987 (Black-banded flathead)
   |  |-- R. portuguesus (Smith, 1953) (South African thorny flathead)
   |  |-- R. prionotus (Sauvage, 1873) (Blackblotch flathead)
   |  |-- R. pristiger (Cuvier, 1829) (Thorny flathead)
   |  |-- R. serratus (Cuvier, 1829) (Serrated flathead)
   |  |-- R. tuberculatus (Cuvier, 1829) (Tuberculated flathead)
   |  `-- R. welanderi (Schultz, 1966) (Welander's flathead)
   |-- Solitas gruveli (Pellegrin, 1905) (Guinea flathead)
   |?- Sorsogona
   |--o Suggrundus [4]
   |  |-- S. brevirostris Shao & Chen, 1987
   |  |-- S. cooperi (Regan, 1908)
   |  |-- S. macracanthus (Bleeker, 1869) Large-spined flathead
   |  `-- S. meerdervoortii (Bleeker, 1860)
   `--o Thysanophrys [6]
      |-- T. armata (Fowler, 1938)
      |-- T. celebica (Bleeker, 1854) (Celebes flathead)
      |-- T. chiltonae Schultz, 1966 (Longsnout flathead)
      |-- T. cirronasa (Richardson, 1848)
      |-- T. longirostris (Shao & Chen, 1987)
      `-- T. papillaris Imamura & Knapp, 1999

Reference(s):