Dimetrodon.
Synapsid, meaning it was more closely related to mammals than reptiles. It lived during the Permian epoch. Its sail is regarded as being for thermoregulation, enabling it to get warmer faster, and so catch food earlier in the day than other predators may have been able to. This thermoregulation would have led to mammals being ‘warm-blooded’.

  1. jurassicturtle reblogged this from lostbeasts
  2. lustermuse reblogged this from scientificillustration
  3. withyourxxx reblogged this from scientificillustration
  4. esho84 reblogged this from scientificillustration
  5. dinosaurings reblogged this from scientificillustration
  6. satousmuses reblogged this from scientificillustration
  7. cortnan reblogged this from bioticbear
  8. sara-friend reblogged this from scientificillustration
  9. disconnectmyhead reblogged this from scientificillustration and added:
    goddamn i wish i could time travel
  10. bioticbear reblogged this from scientificillustration
  11. komainucalamity reblogged this from scientificillustration
  12. centumplagaxxv reblogged this from scientificillustration
  13. jpskirmse reblogged this from scientificillustration
  14. amysaurus reblogged this from scientificillustration
  15. shewasahiphiphiplady reblogged this from scientificillustration
  16. cephalopodqueen reblogged this from scientificillustration