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Vertebrates

Vertebrates. Chapter 34. Review. Chordates 4 derived characters that distinguish from invertebrates Craniates Chordates with heads Hox genes Vertebrates Craniates with backbones Dlx genes. Invertebrate Chordates. Clade Urochordata – tunicates, sea squirts

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Vertebrates

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  1. Vertebrates Chapter 34

  2. Review • Chordates • 4 derived characters that distinguish from invertebrates • Craniates • Chordates with heads • Hox genes • Vertebrates • Craniates with backbones • Dlx genes

  3. Invertebrate Chordates • Clade Urochordata – tunicates, sea squirts • Clade Cephalochordata - lancelets

  4. Invertebrate Craniates • Clade Myxini - hagfish

  5. Vertebrates • Clade Petromyzontida – lampreys

  6. Gnathostomes: Jawed Organisms • Clade Chondrichthyes – sharks, rays, skates, ratfishes • Cartilaginous skeleton • Clade Actinopterygii – ray finned fishes • Bony skeleton, fins with rays • Clade Actinistia – coelocanths • Lobe finned fishes • Clade Dipnoi – lungfishes • Lobe finned fishes with lungs and gills

  7. Tetrapods: Gnathostomes with Limbs • Clade Amphibia – salamanders, frogs, caecilians • Moist skin for gas exchange • Water required for reproduction • Most live in water as juveniles, land as adults

  8. Tetrapods: Gnathostomes with Limbs • Clade Reptilia – lizards, snakes, crocodiles, birds • Amniotic egg: reproduction on land

  9. Tetrapods: Gnathostomes with Limbs • Clade Mammalia • Monotremes: egg laying (ex: platypus) • Marsupials: baby develops in pouch (ex: kangaroo) • Eutherians: placental mammals

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