Chapter 32 - Chapter 32 Animal Diversity I General...

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Chapter 32 Animal Diversity I. General Characteristics 1. Heterotrophs 2. Multicellular 3. No Cell Walls 4. Active Movement 5. Diverse in Form 6. Diverse in Habitat 7. Sexual Reproduction 8. Embryonic Development 9. Unique Tissues
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II. Classification by Body Plan 1. Tissues a. parazoa – lack true tissues b. eumetazoa – true tissues 2. Symmetry - how parts of an animal are arranged around an axis a. asymmetry – absence of symmetry, no central axis = primitive b. radial symmetry – a central axis, oral –aboral axis = slice of pie c. bilateral symmetry – divide into a right and left halves down a longitudinal axis Move towards cephalization = anterior posterior end Moves in one direction 3. embryonic tissue layers a. ectoderm b. endoderm c. mesoderm
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4. Tissue level classification a. diploblastic - two embryonic tissue layers ectoderm, endoderm b. triploblastic – all three layers of tissue, leads to the formation of a body cavity 5. Body cavity (Coelom) a. Advantages of a body cavity
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Chapter 32 - Chapter 32 Animal Diversity I General...

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