chordata powerpoint hannah - Craniates Finallygotmy...

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Craniates Head ( cranium , skull) Genetic complexity Neural crest Higher metabolic rate Extensive muscular  system Heart with at least  two chambers Finally got my  head screwed on!
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The Hagfish Still alive! (Paleozoic  era) Lack jaws, vertebrae Produces slime when  attacked Fossil of an early chordate. Hagfish.
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Gnathostomes Vertebrates that have  jaws Modification of  skeletal rods Lateral line system Placoderms.  Earliest  gnathostomes in the  fossil record, now  extinct.
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Chondrichthyans “cartilage fish” Skeleton composed of  cartilage 750 species Fertilization methods: lay eggs internally,  oviparous,  ovoviviparous,  viviparous Overfishing Stingray. Most rays are bottom dwellers that feed on molluscs and crustaceans. Cartilage lacks a blood supply,  nerves, and lymphatic system.
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Ray Finned Fins supported by  bony rays Functions: 
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chordata powerpoint hannah - Craniates Finallygotmy...

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