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CH_22_STUDENT_OUTLINE

CH_22_STUDENT_OUTLINE - Chapter 22 Animal Diversity I...

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Chapter 22: Animal Diversity I, Invertebrates
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Key Features of Animals
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Animal Evolution
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Porifera (sponges) Cnidaria (jellyfish, corals, anemones) Ctenophora (comb jellies) Arthropoda (insects, arachnids, crustaceans) Platyhelminthes (flatworms) Annelida (segmented worms) Mollusca (clams, snails, octopods) Echinodermata (sea stars, sea urchins) Chordata (lancelets, vertebrates) cuticle molted protostome development deuterostome development bilateral symmetry radial symmetry no tissues tissues Nematoda (roundworms) PRIMITIVE ANCESTOR
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The Appearance of Tissues
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Animal Tissues
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The Appearance of Body Symmetry
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Radial Symmetry
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Radial symmetry central axis plane of symmetry
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radial symmetry
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Bilateral Symmetry
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Bilateral symmetry anterior plane of symmetry posterior
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dorsal anteri or posterior ventral bilateral symmetry
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Body Cavities
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Body Cavity Structure Varies Among Phyla “True” coelom (annelids, chordates)
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Body Cavities - Coelom gut cavity peritoneum lined body cavity (coelom)
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Body Cavity Structure Varies Among Phyla “False” or pseudocoelom (roundworms)
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Body Cavities - Pseudocoel epidermis gut cavity unlined body cavity (pseudocoel) around gut
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Body Cavity Structure Varies Among Phyla No coelom (cnidarians, flatworms)
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Body Cavities - Acoelomate epidermis gut cavity no body cavity; region between gut and body wall packed with organs
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