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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

Vertebrates

Chapter 34

review
Review
  • Chordates
    • 4 derived characters that distinguish from invertebrates
  • Craniates
    • Chordates with heads
    • Hox genes
  • Vertebrates
    • Craniates with backbones
    • Dlx genes
invertebrate chordates
Invertebrate Chordates
  • Clade Urochordata – tunicates, sea squirts
  • Clade Cephalochordata - lancelets
invertebrate craniates
Invertebrate Craniates
  • Clade Myxini - hagfish
vertebrates1
Vertebrates
  • Clade Petromyzontida – lampreys
gnathostomes jawed organisms
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
tetrapods gnathostomes with limbs
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
tetrapods gnathostomes with limbs1
Tetrapods: Gnathostomes with Limbs
  • Clade Reptilia – lizards, snakes, crocodiles, birds
    • Amniotic egg: reproduction on land
tetrapods gnathostomes with limbs2
Tetrapods: Gnathostomes with Limbs
  • Clade Mammalia
    • Monotremes: egg laying (ex: platypus)
    • Marsupials: baby develops in pouch (ex: kangaroo)
    • Eutherians: placental mammals