Animal Evolution - Evolution of Animals(Metazoa BIOL 1407...

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Evolution of Animals (Metazoa) BIOL 1407
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Animal Body Plan Tissues Absent = Parazoa Present = Eumetazoa
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Radial Symmetry Encounter environment equally from all sides Sessile, sedentary or planktonic Sea Anemone Feeding Video http://www.mbayaq.org/efc/video_library/vide Then click on “Anemone Feeding” Jellyfish Swimming http://www.youtube.com/watch?v=760lUxyle6I
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Bilateral Symmetry Central nervous system in head Active movers Frilled lizard video http://video.nationalgeographic.com/video/pla Crocodile gallop video http://www.flmnh.ufl.edu/natsci/herpetology/b
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Number of Germ Layers Diploblastic: has two germ layers Endoderm Ectoderm Triploblastic: has three germ layers Endoderm Mesoderm Ectoderm
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Question?
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Body Cavities What is a body cavity? Fluid-filled cavity separates digestive tract from body wall
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Body Cavities Advantages: Fluid cushions organs Acts as hydrostatic skeleton Allows internal organs to move independently of body wall Allows internal organs space for folding
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