chapter_31_ - Overview of Animal Diversity Chapter 31 1...

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1 Overview of Animal Diversity Chapter 31
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2 2 Outline • General Features of Animals • Traditional Classification of Animals • Key Transitions in Body Plan • New Look at Metazoan Family Tree • Roots of the Animal Family Tree
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3 3 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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4 4 Diverse 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 (mostly composed by sponges). –Eumetazoa have definite shape and symmetry and usually have organs and organ systems.
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5 5
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6 6 Traditional Classification of Animals Second branch - symmetry – Eumetazoan branch has two principles branches. Radiata - radial symmetry Bilateria - bilateral symmetry – Further branches were assigned by comparing key shared features of the body plan. • body cavity –coe
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7 7 Broad Groupings of Kingdom Animalia
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8 Key Transitions in Body Plan • Evolution of tissues – first key transition in animal body plan
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Spring '08 term at Wayne State University.

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chapter_31_ - Overview of Animal Diversity Chapter 31 1...

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