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Announcements, questions, and figures from a biology class on invertebrates (part 2), covering topics such as symmetry, body plans, and phyla. It includes information on sponges, cnidaria, porifora, radiata, bilateria, triploblastic, lophotrochozoans, platyhelminthes, mollusca, annelida, and arthropoda.
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A. cephalization. B. the presence of mesoderm. C. an active lifestyle. D. a nervous system with sensory structures concentrated at one end of the animal. E. the sessile condition.
A. They are sedentary and resemble plants. B. Most individuals are hermaphrodites. C. They lack true tissues. D. They do not have specialized cell types. E. They have only two layers of cells.
A. All are filter feeders. B. All live in tropical oceans. C. All are strong swimmers. D. All have a gastrovascular cavity and tentacles. E. All reproduce mainly asexually.
Figure 33.4 Anatomy of a sponge •^ Cnidocytes^ = stinging cells for prey capture & defense
mussels Marine & freshwater Shells divided into 2 halves Bivalves are filter feeders Often use their foot as an anchor Many play important ecological roles Eg. Zebra mussels
True Coelom is divided into compartments by septa: segmented body Muscles run longitudinally & circularly – distinctive movement Nervous system Gut tract w/ specialized regions Closed circulatory system
Figure from: Minnesota Worm Watch http://www.nrri.umn.edu/worms/forest.html