• Thumbnail for Sphenacodon
    Sphenacodon (meaning "wedge point tooth") is an extinct genus of synapsid that lived from about 300 to about 280 million years ago (Ma) during the Late...
    17 KB (1,871 words) - 04:56, 16 June 2024
  • Thumbnail for Sphenacodontia
    largest clade that includes Haptodus baylei, Haptodus garnettensis and Sphenacodon ferox, but not Edaphosaurus pogonias". They first appear during the Late...
    7 KB (455 words) - 21:14, 8 August 2024
  • Thumbnail for Sphenacodontidae
    large (~3 meters) and advanced members of this group (Ctenospondylus, Sphenacodon, Secodontosaurus and Dimetrodon) are distinguished by a tall sail along...
    8 KB (694 words) - 21:49, 4 January 2024
  • Thumbnail for Secodontosaurus
    contrast, Sphenacodon and Ctenospondylus have a lower dorsal crest formed from flat, blade-like neural spines, relatively low in Sphenacodon and taller...
    16 KB (1,706 words) - 08:39, 26 June 2024
  • Thumbnail for Dimetrodon
    small region of North America, while a smaller sphenacodontid called Sphenacodon dominated the western area. While this seaway probably did exist, the...
    81 KB (9,050 words) - 08:32, 31 July 2024
  • Thumbnail for Pelycosaur
    much smaller. Well-known pelycosaurs include the genera Dimetrodon, Sphenacodon, Edaphosaurus, and Ophiacodon. Pelycosaur fossils have been found mainly...
    12 KB (1,185 words) - 00:02, 11 August 2024
  • Thumbnail for Edaphosaurus
    scientifically updated form (with a long tail) alongside Dimetrodon and Sphenacodon to represent the Permian period in his famous The Age of Reptiles mural...
    36 KB (4,254 words) - 13:03, 23 May 2024
  • Lepidodendron Sigillaria Permian Seymouria Limnoscelis Varanosaurus Ophiacodon Sphenacodon Araeoscelis Dimetrodon Edaphosaurus Cordaites Triassic Saltoposuchus...
    8 KB (788 words) - 21:03, 28 June 2024
  • Thumbnail for Steppesaurus
    Eupelycosauria belonging to the Sphenacodontidae, related to Dimetrodon and Sphenacodon, from the Late Permian San Angelo Formation of Texas. A maxilla and dentary...
    2 KB (236 words) - 21:18, 20 September 2021
  • Thumbnail for Eupelycosauria
    Sphenacodon Ctenospondylus...
    10 KB (775 words) - 00:16, 11 August 2024