Chordates

Features of chordates

• Notochord
• Pharyngeal slits
• Postanal tail
• Hollow nerve cord

Tunicates: Sea Squirts

Adults have no head or developed brain

Lancelets: Brain, no head

Hagfish: head, no v-column

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• Called "slime eels"
• Important seafloor cleaners
• No jaws or bones

Lampreys: v-column, no jaws

Sharks, Rays, Skates

Jaws, no lungs

Ray-finned Fish: lungs, no lobed fins

Lobed-finned Fish: No legs

Amphibians: Legs, no amniotic egg

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• Salamanders and Newts
• Frogs and Toads
• Caecillians

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Reptiles and birds: eggs, no milk

Reptiles

• Turtles
• Lizards and snakes
• Crocodilians
• Tuataras

Birds

• Feathers and wings
• One-way air system
• Endothermic

Mammals: Milk

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