Invertebrates 2 - Invertebrates Click to edit Master...

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Click to edit Master subtitle style 10/24/10 Invertebrates
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10/24/10 Sponges in the Metazoan tree
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10/24/10 Sponges Sponges used to be defined by having spicules Some fossil things looked for all the world like sponges but didn’t have spicules Some of these fossil things have been rediscovered Demospongia and Calcarea have
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10/24/10 Sponges –basic structures Lack true tissue Two layers of cells separated by a gelatinous region called the mesohyl Some debate that mesohyl and pinacoderm are actually tissue
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10/24/10 Sponges –natural history Water type [4] Depth[4] Type of surface[4] Calcarea Marine less than 100 metres (330 ft) Hard Glass spong Marine Deep Soft or firm sediment Demospong Marine, brackish; and about 150 freshwater species[3] Inter-tidal to abyssal; [4] a carnivorous demospong e has been found at 8,840 metr es (5.49 mi) [17] Any
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10/24/10 Sponges: natural history
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10/24/10 Cnidarians
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10/24/10 Cnidarians in the Metazoan tree
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10/24/10 Cnidarians – two body forms Radial symmetry, diploblastic
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10/24/10 Cnidarians - Cnidocysts A type of cnidocyst, the nematocyst, is used for prey capture and defense
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10/24/10 Cnidarians – 4 classes Hydrozoa Most Cnidaria are marine but some Hydra are found in freshwater Both plyps and medusae Scyphozoa (jellyfish) Medusa is the prominent stage Polyps seen in coastal but not deep water forms
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10/24/10 Coral – a symbiotic organism that makes big things
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10/24/10
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Click to edit Master subtitle style 10/24/10 Lophotrochozoa A very heterogeneous clade
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10/24/10 Platyhelminthes Triploblastic Acoelomate Bilateral symmetry Dorsoventrally flattened
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10/24/10 Platyhelminthes in the Metazoan tree
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10/24/10 Platyhelminthes Gastrovascular cavity is present in free-living forms but not in some parasites
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This note was uploaded on 10/23/2010 for the course BIOL 2308 taught by Professor Boxer during the Spring '10 term at University of Houston - Downtown.

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Invertebrates 2 - Invertebrates Click to edit Master...

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