10 - Lecture 15: Invertebrate Radiations 1: Intro to...

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Lecture 15: Invertebrate Radiations 1: Intro to Animals: 2/10/10 A. An Introduction to Animals 1. Groups of animals are recognized by Basic body plan 2. Differs in body plan, types of tissues 3. Innovative ways of feeding and moving B. Animals are a Monophyletic Group Recognized By: 1. Their multicellularity 2. Heterotrophs 3. Move under own power at some point in life cycle 4. Animals have no cell ways, only an extensive extracellular matrix 5. Animals are the only lineage with muscle and nerve tissue 6. Do not undergo alternation of generations 7. Adults of most species are diploid while gametes are haploid C. Evolution of Tissues 1. All animals have tissues and epithelium (layer of tightly joined cells that covers the body surface) 2. Dipoblasts : Animals with embryos that have two germ layers: ectoderm (muscle) and endoderm (reproductive tissue) 3. Tripoblasts : Animals have three types of germ layers: ectoderm (muscle), mesoderm, and endoderm (bones) D. Symmetry and Cephalization (formation of head)
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10 - Lecture 15: Invertebrate Radiations 1: Intro to...

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