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Animal+diversity+I+final+text - Overview of Animal...

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1 Overview of Animal Diversity
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2 General Features of Animals Heterotrophs Multicellular Able to move from place to place Diverse in form and habitat Sexual reproduction Characteristic embryonic development
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3 Diverse Animal Kingdom
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4 Diverse Animal Kingdom Traditional classification of animals multicellular animals, metazoans, traditionally divided into 35 distinct phyla First branch - tissues Parazoa lack definite symmetry and do not possess tissues or organs. Eumetazoa have definite shape and symmetry and usually have organs and organ systems.
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5 Traditional Classification of Animals Second branch - symmetry Eumetazoan branch has two principles branches. Radiata - radial symmetry, diploblastic Bilateria - bilateral symmetry, triploblastic Further branches were assigned by comparing key shared features of the body plan. body cavity coelom
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6 Key Transitions in Body Plan 1.Evolution of tissues first key transition in animal body plan 2.Evolution of bilateral symmetry radial symmetry - regular arrangement of parts around central axis bilateral symmetry - right and left halves form mirror images dorsal vs. ventral anterior vs. posterior
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7 Bilateral Symmetry Bilaterally symmetrical eumetazoans produce three germ layers. ectoderm
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This note was uploaded on 04/08/2008 for the course BIOL 1710 taught by Professor Jag during the Spring '08 term at North Texas.

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Animal+diversity+I+final+text - Overview of Animal...

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