What%20is%20an%20animal

What%20is%20an%20animal - What is an animal? 12/23/09 Major...

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12/23/09 What is an animal?
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12/23/09 Major Events in Animal I. No symmetry •. Porifera (sponges) II. Radial vs. bilateral symmetry . •. Radial symmetry --- sessile animals. Animal : multicellular, heterotrophic eukaryotes that obtain nutrition by ingestion .
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12/23/09 Major Events in Animal III. Evolution of body cavities. •. Body cavity -- fluid-filled space separating digestive tract from outer body wall. •. Phylum Platyhelminthes -- acoelomate . •.
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12/23/09 (a) No body cavity (e.g., flatworm) Body covering (from ectoderm) Digestive tract (from endoderm) Tissue-filled region (from mesoderm) (b) Pseudocoelom (e.g., roundworm) Pseudocoelom Digestive tract (from endoderm) Body covering (from ectoderm) Muscle layer (from mesoderm) (c) True coelom (e.g., annelid) Coelom Digestive tract (from endoderm) Body covering (from ectoderm) Tissue layer lining coelom and suspending internal organs (from mesoderm) Mesentery
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12/23/09 Major Events in Animal IV. Protostomes vs. deuterostomes . •. 2 distinctly different ways the
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What%20is%20an%20animal - What is an animal? 12/23/09 Major...

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