Chapter32 - Introduction to Animals! Chapter 32 The...

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Introduction to Animals Chapter 32
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2 The Cambrian Explosion
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The Cambrian Explosion • All extant Phylla are present • Occurs in a “brief” geological time • Hypotheses: – Increased oxygen levels in the ocean – Evolution of predation • Light and movement sensing organs (2011)
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The Burgess Shale Fauna Anomalocaris
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Marrella
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Opabinia 5 eyes predatory affinities unknown
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Wiwaxia affinities unknown
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The Burgess Shale Fauna Hallucigenia
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Why are we here? Pikaia
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Animals • What is an animal? • How many species and major groups • Major adaptations: body plan, tissues, development, behavior, etc. • Relationship among animals • Reproduction
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Animals • Eukaryotic • Heterotrophs – Herbivory, predation, parasitism, parasitoids • Multicellularity – allowed for multiple tissues to evolve – leads to increased specialization and complexity
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Animals • Monophyletic group • Between 10 – 50 million spp – Most species are Arthropods (insects, crustaceans and arachnids) • Diverse body plans 1. Number of embryonic tissues 2. Type of symmetry 3. Body cavity 4. Events in embryonic development
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13 Animal Kingdom
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Chapter32 - Introduction to Animals! Chapter 32 The...

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