4-Animal_Div._I_Inverts-33-S08-_fixed

4-Animal_Div_I_Inve - 1 Animal Diversity I Meet the Inverts Animal Diversity I Meet the Inverts Meet the Inverts Meet the Inverts • From the most

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Unformatted text preview: 2/21/2008 1 Animal Diversity I Meet the Inverts! Animal Diversity I Meet the Inverts! Meet the Inverts! Meet the Inverts! • From the most primitive to the most derived. • Keeping in mind the evolution of animals and the characters we use to categorized them. Review of defining characters Review of defining characters • Eukaryotic – multicellular • Nutrition – heterotrophic, ingest food • Mobile – at some time in life • Cellular structure – animals lack cell walls, collagen, nervous and muscle tissue • Reproduce sexually – some can use asex. reprod. Mostly in the diploid stage • Development – show cleavage (blastula, gastrula, larva…) Parazoa Parazoa Phylum: Porifera (pore-bearing) = Sponges Characters :- asymmetrical body - no true tissues- filter feeders- Found in FW and SW Sponges Figure 33.3 Anatomy of a sponge Sponge spicules 2/21/2008 2 Eumetazoa Radiata Eumetazoa Radiata Phylum: Cnidaria (nettle-like) = Jellyfishes, anemones, and corals Characters :- radial symmetry - diploblastic (endo and ectoderm)- sac-like gut, gastrovascular cavity- primitive nervous net, muscle cells, no true organ systems- tentacles with stinging cells “cnidocytes” Figure 33.4 Polyp and medusa forms of cnidarians Figure 33.5 A cnidocyte of a hydra Figure 33.6 Cnidarians: Hydrozoans (top left), jelly (top right), sea anemone (bottom left), coral polyps (bottom right) Figure 33.7 The life cycle of the hydrozoan Obelia (Layer 3) Eumetazoa Radiata Eumetazoa Radiata Phylum: Cnidaria (nettle-like) = Jellyfishes, 3 major classes: Class: Hydrozoa Hydrozoa = polyp/medusa form conspicuous, mostly marine, Exp/ Hydra Class: Anthozoa Anthozoa = polyp form only, all marine, Exp/ Corals and anemones Class: Scyphozoa Scyphozoa = all marine, planktonic, medusa dominant stage, Exp/ jellyfishes 2/21/2008 3 Figure 33.6 Cnidarians: Hydrozoans (top left), jelly (top right), sea anemone (bottom left), coral polyps (bottom right) Class: Hydrozoa Class: Hydrozoa Class: Scyphozoa Class: Scyphozoa Class: Anthozoa Class: Anthozoa Eumetazoa Radiata Eumetazoa Radiata Phylum: Ctenophora (comb animal) = comb jellies Characters:- radial symmetry - diploblastic (endo and ectoderm)- gelatinous- complete gut!- colloblasts instead of cnidocytes Ctenophores galore! Sea gooseberry, Pleurobrachia bachei Eumetazoa Bilateria, Protostomia , Lophotrochozoa Eumetazoa Bilateria, Protostomia , Lophotrochozoa Phylum: Platyhelminthes (flat worms) = flukes and tapeworms Characters:- bilateral symmetry - triploblastic, but acoelomates- sac-like gut, gastrovascular cavity- free living and parasitic forms...
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This note was uploaded on 05/18/2008 for the course BIOL 211B taught by Professor Lowe/zahn during the Spring '08 term at CSU Long Beach.

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4-Animal_Div_I_Inve - 1 Animal Diversity I Meet the Inverts Animal Diversity I Meet the Inverts Meet the Inverts Meet the Inverts • From the most

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