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Chapter 34 - Chapter 34 Vertebrates 1 Chordates have a...

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Chapter 34 - Vertebrates 1) Chordates have a notochord and a dorsal, hollow nerve chord a) Chordates are deuterostome bilaterian animals b) 2 chordate subphyla are invertebrates i) Urochordata ii) Cephalochordata c) Vertebrata is also a subphylum of chordata 2) Derived Characters of Chordates a) All chordates share 4 derived characters b) Although some species posses some of these traits only during embryonic development 3) Tunicates a) Subphylum Urochordata b) Deepest-branching lineage of chordates c) Sessile marine suspension feeders i) Draws water in through incurrent siphon, filtering food particles d) Tunicates posses the chordate characteristics during their larval stage 4) Lancelets a) Subphylum Cephalochordata b) Marine suspension feeders c) Retain chordate features throughout lifespan 5) Craniates are chordates that have a head a) The origin of the head in chordates allowed some to become active predators b) Shared characters in craniates i) Skull ii) Brain iii) Eyes and other sensory organs
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c) Hagfishes
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