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Lec21 - Animals Vertebrates Tuesday characteristics of...

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Animals: Vertebrates Tuesday 11/15/11 characteristics of vertebrates unifying characteristics of animals & vertebrates primitive vertebrates fish adaptations onto land amphibians reptiles birds mammals © Phil Kelly
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General Features of Animals Animals share many important characteristics: are are can have diverse reproduce have a have unique tissues
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Chordates: Improving the Skeleton Chordates are deuterostome like the echinoderms: they exhibit a truly this innovation opened the door to The approximately 56,000 species of chordates all share four principal features:
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Characteristic of Chordates: during embryonic development 1) notochord 2) dorsal, hollow nerve cord 3) pharyngeal slits 4) muscular post-anal tail
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Figure 31.4 :
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Not all chordates are vertebrates tunicates and lancelets are chordates see figures 31.5 & 31.6 Vertebrate chordates differ from tunicates and lancelets in two important respects: vertebrates have vertebrates have Chordates:
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