Lecture 14, Ch. 33

Lecture 14, Ch. 33 - Lecture #14 Date _ s Chapter 33 ~...

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Lecture #14 Date _____ Chapter 33 ~ Invertebrates
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Parazoa Invertebrates: animals without backbones Closest lineage to protists Loose federation of cells (unspecialized); no tissues Phy.: Porifera (sponges)
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Phylum : Porifera (“pore bearer”) Sessile (attached to bottom) Spongocoel (central cavity) Osculum (large opening) Choanocytes (flagellated collar cells) Hermaphroditic (produce both sperm and eggs)
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The Radiata, I Diploblastic Radial symmetry Phy : Cnidaria (hydra, jellies, sea anemones, corals) No mesoderm; GVC gastrovascular cavity (sac with a central digestive cavity) Hydrostatic skeleton (fluid held under pressure) Polyps and medusa Cnidocytes (cells used for defense and prey capture) Nematocysts (stinging capsule)
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The Radiata, II Phy : Ctenophora (comb jellies) 8 rows of comblike plates of fused cilia (largest animals that use cilia for locomotion) Tentacles with colloblasts (adhesive structures that capture prey)
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This note was uploaded on 09/22/2009 for the course BIOL BIOL 51 taught by Professor Janetkoprivnikar during the Spring '08 term at Pacific.

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Lecture 14, Ch. 33 - Lecture #14 Date _ s Chapter 33 ~...

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