20_Animal_diversification

20_Animal_diversification - Animal diversification Todays...

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Animal diversification Today’s questions: I. What are animals? II. What changes in body plans occurred as animals diversified?
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I. What are animals? Most recent phylogeny
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Essence of “animal - ness”? Essential animal traits Multicellular Move Eat Fig. 32.11 Muscles Skeleton Cephalization/ Symmetry
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I. What changes in body plans occurred as animals diversified? A. Multicellularity and tissues All animals are multicellular Cells bind to each other Cells communicate Division of labor (some function in feeding, structure, reproduction)
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Origin of tissues (integrated groups of cells that perform a particular function) Epithelium in sponges ? Germ layers (tissues) in embryos Ectoderm Endoderm Mesoderm
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I. What changes in body plans occurred as animals diversified? Basic symmetry types : Many “mouths” (sponge) = “Bag” (Cnidarians) = Tube-within-a-tube = B. Body symmetry & cephalization
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Classically: Radial symmetry in diploblasts
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20_Animal_diversification - Animal diversification Todays...

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