ExamIAnimalGuide-Invert

ExamIAnimalGuide-Invert - I Invertebrates a Parazoans i...

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I. Invertebrates a. Parazoans i. Porifera (sponges) a. Suspension feeders b. Water is drawn through spongocoel and out through osculum. c. Choanacytes traps food particles and ingests by phagocytosis. d. Contains a layer called the mesohyl which contains amoebocytes which digest food and manufacture skeletal fibers. b. Eumetazoans i. Radiata i. Cnidarians 1. Hydrozoans (Colonial polyps) a. Reproduces asexually when conditions are favorable. 2. Scyphozoans (Jellies) a. Medusa-stage 3. Cubozoans (Sea-wasps) a. Highly toxic cnidocytes 4. Anthozoans (Sea anemones) a. Polyp-stage b. Provide a habitat for other species ii. Bilateria 1. Protostomes a. Lophotrochozoa i. Platyhelminthes 1. Turbellaria (Planarians) a. Acoelomates, gas exchange and elimination of nitrogenous waste diffuses across body surface. b. Gastrovascular cavity with one opening 2. Monogea a. Marine and freshwater parasites with suckers for attaching to internal organs or the outer surfaces of hosts 3. Trematoda (Flukes) a. Evades immune systems by mimicking surface proteins of host 4. Cestoidea (Tapeworm) a. Anterior end (scolex) with suckers that hooks or locks the worm into the intestinal lining.
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