Lec20 - Thursday Animals what makes an animal traditional...

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Thursday 11/12/09 Animals what makes an animal? traditional & molecular phylogenies main branch points in animal evolution survey of adaptations in invertebrates evolution of key evolutionary adaptations increase in diversity
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General Features of Animals Animals share many important characteristics: are are can have reproduce, have a have unique tissues
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Five Key Transitions in Body Plan The evolution of animals is marked by five key transitions in body plan 1. 2. 3. 4. 5.
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Be familiar with the main groups of animals & adaptive significance of derived characters. fig 25.3 Evolutionary trends in animal evolution:
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no symmetry - ingest prey diffusion stationary Sponges - earliest animals (1) multicellularity - Main branch points in the evolution of animals:
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Figure 25.5 Phylum Porifera: sponges
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Main branch points in the evolution of animals: (2) evolution of true tissue Cnidarians: jellyfish, sea
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Phylum Cnidaria: cnidarians
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Lec20 - Thursday Animals what makes an animal traditional...

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