Lecture8 Vertebrates - Ch 34 Chordates(mostly Vertebrates...

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Slide 1 Invertebrates 1 Ch. 34 - Chordates (mostly Vertebrates) pgs. 671-709 Monday: sea squirts to fish Wednesday: tetrapods Monday: primates
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Slide 2 Invertebrates 1 Why spend 3 days on vertebrates? We are vertebrates We eat vertebrates Vertebrates can control ecosystems Interesting evolutionary innovations: backbones, jaws, flight, amniotic egg, big brains
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Slide 3 Invertebrates 1 What makes a chordate? Ancestral deuterostome 1) Notochord, 2) Dorsal hollow nerve cord, 3) Pharyngeal slits, 4) Muscular post-anal tail Chordates Fig. 34.2, pg. 672
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Slide 4 Invertebrates 1 Ancestral deuterostome 1) Notochord, 2) Dorsal hollow nerve cord, 3) Pharyngeal slits, 4) Muscular post-anal tail Urochordates (i.e., tunicates or seasquirts)
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QuickTime Q and a TIFF (Uncompressed) decompressor are needed to see this picture. These are your close relatives?
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Slide 6 Invertebrates 1 Tunicates only look like chordates as larvae Fig. 34a, b, c, pg. 674
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Slide 7 Invertebrates 1 Ancestral deuterostome Brain (sort of) Cephalochordates (i.e., lancelets)
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Slide 8 Invertebrates 1 QuickTime P and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Amphioxus
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Slide 9 Invertebrates 1 Lancelet nerve cord homologous to vertebrate brain
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Slide 10 Invertebrates 1 What are HOX genes?
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  • Fall '06
  • 11:00-01:50pm
  • Evolution, Sarcopterygii

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