2005_campbl33

2005_campbl33 - Chapter 33 Invertebrates Animal Phylogeny(compacted Some Animal Phyla Porifera Sponges are simple sessile animals that lack true

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Chapter 33: Invertebrates
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Animal Phylogeny (compacted)
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Some Animal Phyla
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Porifera “Sponges are simple, sessile animals that lack true tissues. They live as suspension feeders, trapping particles that pass through the internal channels of their bodies.” p. 639, Campbell and Reece (2005)
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Porifera Characteristics Sponges Sole member of the Parazoa Lack true tissues, simplest of animals, no nerves or muscles Choanocytes (collar cells) “Unique flagellated cells that ingest bacteria and tiny food particles” Choanocytes look a lot like Choanoflagellates Amoebocytes transfer food to rest of cells Adults sessile, larvae non-sessile “Cells tend to be totipotent (retain zygote’s ability to form the whole animal)”
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Sponge Anatomy
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Cnidaria “Cnidarians include corals, jellies, and hydras. These animals share a distinctive body plan that includes a gastrovascular cavity with a single opening that serves as both mouth and anus.” p. 639, Campbell and Reece (2005)
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Cnidaria Characteristics Hydras, Jellies, Sea Anenomies, Corals One member of the Radiata (also Ctenophora) Diploblastic, Carnivorous, Tentacled Lack true muscles (since no mesoderm) Possess nerve net Cnidocytes Cells that shoot stinging or grasping threads at potential prey Grastrovascular cavity (only one opening) = Hydrostatic Skeleton Polyps vs. Medusa
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Various Cnidarians
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Cnidaria Anatomy Don’t forget that cnidarians are carnivorous
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Cnidocytes
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Cnidaria Classes
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Obelia Life Cycle
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Platyhelminthes “Flatworms (including tapeworms, planarians, and flukes) have bilateral symmetry and a central nervous system that processes information from eyes and other senory structures. They have no body cavity or organs for circulation.” p. 639, Campbell and Reece (2005)
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Platyhelminth Characteristics Flatworms (including Flukes and Tapeworms) Bilaterally symmetrical acoelomates Flat, unsegmented, single opening to gastrovascular cavity Eyespots, flaps on head involved in sense of smell No circulatory system (instead diffusion) The flat shape makes diffusion a very real option for movement of stuff (digestive products, nitrogenous waste, oxygen, CO 2 about the animal or relative to the outside world)
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This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

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2005_campbl33 - Chapter 33 Invertebrates Animal Phylogeny(compacted Some Animal Phyla Porifera Sponges are simple sessile animals that lack true

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