Lec21 - Animals: Vertebrates Tuesday 11/15/11...

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Unformatted text preview: 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 General Features of Animals Animals share many important characteristics: are are can have diverse reproduce have a have unique tissues 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: Characteristic of Chordates: during embryonic development 1) notochord 2) dorsal, hollow nerve cord 3) pharyngeal slits 4) muscular post-anal tail Figure 31.4 : 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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This note was uploaded on 01/18/2012 for the course L 100 taught by Professor Dr.susanhengeveld during the Fall '11 term at Indiana.

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Lec21 - Animals: Vertebrates Tuesday 11/15/11...

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