Porifera and Cnidaria notes - Spring 2008-1

Porifera and Cnidaria notes - Spring 2008-1 - in between-2...

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Survey of the Animal Kingdom Phyla Porifera and Cnidaria Phylum Porifera = sponges - Asymmetrical - No tissues/organs - Sessile - Filter-feeders - Sponge body : pores(ostia), spongocoel, osculum, spicules, spongin, choanocytes, amoebocytes Phylum Cnidaria = hydras, jellyfish, corals, sea anemones - Radial symmetry - 2 tissue layers: ectodermis and endodermis (gastrodermis) with mesoglea (jelly)
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Unformatted text preview: in between-2 body forms are common: polyp vs medusa-Have cnidocytes (stinging cells) with nematocysts – located on tentacles-Three classes o 1. Hydrozoa = Hydra, Obelia, Physalia, Gonionemus o 2. Scyphozoa = Aurelia o 3. Anthozoa = Metridium , corals...
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