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View Full Version : I-Vertebrate Evolution and Diversity


  1. 1- Shared derived characters define the major clades of chordates
  2. 2- Hagfishes and lampreys lack hinged jaws
  3. 3- Jawed vertebrates with gills and paired fins include sharks, ray-finned fishes, and lobe-finned fishes
  4. 4- Evolution Connection: New fossil discoveries are filling in the gaps of tetrapod evolution
  5. 5- Amphibians are tetrapods—vertebrates with two pairs of limbs
  6. 6- Reptiles are amniotes—tetrapods with a terrestrially adapted egg
  7. 7- Birds are feathered reptiles with adaptations for flight
  8. 8- Mammals are amniotes that have hair and produce milk