ammonites
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Taxonomic names from A. S. Romer and L. I. Price 1940

  • Anningia, Broom 1927 [Amniota]
  • Edaphosauria, suborder, Cope 1882 [Pelycosauria]
  • Edaphosaurus mirabilis (Fritsch 1895) [Edaphosauridae]
  • Edaphosaurus raymondi (Case 1908) [Edaphosauridae]
  • Eothyrididae, family, A. S. Romer and L. I. Price 1940 [Caseasauria]
  • Haptodontinae, subfamily, A. S. Romer and L. I. Price 1940 [Sphenacodontia]
  • Nitosauridae, family, A. S. Romer and L. I. Price 1940 [Pelycosauria]
  • Ophiacodon major, A. S. Romer and L. I. Price 1940 [Ophiacodontidae]
  • Ophiacodontia, suborder, A. S. Romer and L. I. Price 1940 [Pelycosauria]
  • Palaeohatteria, Credner 1888 [Sphenacodontia]
  • Palaeohatteria longicaudata, Credner 1888 [Haptodus]
  • Pantelosaurus, v. Huene 1925 [Sphenacodontia]
  • Pantelosaurus saxonicus, v. Huene 1925 [Haptodus]
  • Secodontosaurinae, subfamily, A. S. Romer and L. I. Price 1940 [Sphenacodontidae]
  • Sphenacodontia, suborder, A. S. Romer and L. I. Price 1940 [Sphenacomorpha]
  • Varanopseidae, family (A. S. Romer and L. I. Price 1940) [Eupelycosauria]

Opinions from A. S. Romer and L. I. Price 1940

  • 'Anningia belongs to Varanopsidae'
  • 'Anningia megalops belongs to Anningia'
  • 'Archaeobelus is a subjective synonym of Clepsydrops'
  • 'Archaeobelus vellicatus is a subjective synonym of Clepsydrops collettii'
  • 'Captorhinus illinoisensis is a subjective synonym of Clepsydrops vinslovii'
  • 'Clepsydrops belongs to Ophiacodontidae'
  • 'Clepsydrops collettii belongs to Clepsydrops'
  • 'Clepsydrops leptocephalus is a subjective synonym of Ophiacodon retroversus'
  • 'Clepsydrops limbatus is recombined as Dimetrodon limbatus'
  • 'Clepsydrops macrospondylus is recombined as Dimetrodon macrospondylus'
  • 'Clepsydrops natalis is recombined as Dimetrodon natalis'
  • 'Clepsydrops pedunculatus is a subjective synonym of Clepsydrops collettii'
  • 'Clepsydrops vinslovii belongs to Clepsydrops'
  • 'Datheosaurus is a subjective synonym of Haptodus'
  • 'Datheosaurus macrourus is recombined as Haptodus macrourus'
  • 'Dimetrodon cruciger is recombined as Edaphosaurus cruciger'
  • 'Dimetrodon navajovicus is recombined as Ophiacodon navajovicus'
  • 'Edaphosauria belongs to Pelycosauria'
  • 'Edaphosaurus belongs to Edaphosauridae'
  • 'Eothyrididae belongs to Ophiacodontia'
  • 'Eumatthevia is a subjective synonym of Mycterosaurus'
  • 'Eumatthevia bolli is a subjective synonym of Mycterosaurus longiceps'
  • 'Haptodontinae belongs to Sphenacodontidae'
  • 'Haptodus belongs to Haptodontinae'
  • 'Mycterosaurus belongs to Nitosauridae'
  • 'Mycterosaurus longiceps belongs to Mycterosaurus'
  • 'Naosaurus credneri is recombined as Edaphosaurus credneri'
  • 'Naosaurus mirabilis is recombined as Edaphosaurus mirabilis'
  • 'Naosaurus raymondi is recombined as Edaphosaurus raymondi'
  • 'Nitosauridae belongs to Edaphosauria'
  • 'Ophiacodon belongs to Ophiacodontidae'
  • 'Ophiacodon major belongs to Ophiacodon'
  • 'Ophiacodon mirus belongs to Ophiacodon'
  • 'Ophiacodontia belongs to Pelycosauria'
  • 'Palaeohatteria is a subjective synonym of Haptodus'
  • 'Palaeohatteria longicaudata belongs to Palaeohatteria' according to Credner 1888
  • 'Palaeohatteria longicaudata is recombined as Haptodus longicaudatus'
  • 'Pantelosaurus is a subjective synonym of Haptodus'
  • 'Pantelosaurus saxonicus belongs to Pantelosaurus' according to v. Huene 1925
  • 'Pantelosaurus saxonicus is recombined as Haptodus saxonicus'
  • 'Pelycosauria belongs to Synapsida'
  • 'Poecilospondylus is a subjective synonym of Varanosaurus'
  • 'Poecilospondylus francisi is a subjective synonym of Varanosaurus acutirostris'
  • 'Poliosauridae is an invalid subgroup of Ophiacodontia'
  • 'Poliosaurus is a subjective synonym of Ophiacodon'
  • 'Secodontosaurinae belongs to Sphenacodontidae'
  • 'Sphenacodontia belongs to Pelycosauria'
  • 'Tetraceratops belongs to Eothyrididae'
  • 'Tetraceratops insignis belongs to Tetraceratops'
  • 'Theropleura is a subjective synonym of Ophiacodon'
  • 'Theropleura grandis is recombined as Dimetrodon grandis'
  • 'Theropleura retroversa is recombined as Ophiacodon retroversus'
  • 'Theropleura triangulata is a subjective synonym of Ophiacodon retroversus'
  • 'Theropleura uniformis is recombined as Ophiacodon uniformis'
  • 'Therosaurus watsoni is a subjective synonym of Ophiacodon retroversus'
  • 'Trichasaurus belongs to Edaphosauria'
  • 'Trispondylus texensis is recombined as Trichasaurus texensis'
  • 'Varanopsidae belongs to Sphenacodontia'
  • 'Varanosaurus belongs to Ophiacodontidae'
  • 'Varanosaurus acutirostris belongs to Varanosaurus'
  • 'Varanosaurus brevirostris is recombined as Varanops brevirostris' according to Watson 1914
  • 'Winfieldia is a subjective synonym of Ophiacodon'
  • 'Winfieldia hilli is recombined as Ophiacodon hilli'