01:119:116 Lecture Notes - Lecture 6: Filter Feeder, Sea Anemone, Radula
14 Mar 2016
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A. lack backbone: >95% of all animal spp, figure 33. 2, pg 710 as well. No true tissues or organs: asymmetric. A. typical simple sponge: simple sac-like body, holds lots of holes, osculum - open end, spongocoel. Acts as passage for h2o: water comes into sponge and leaves through osculum. Acts as a filter feeder: is not a digestive chamber. Very similar to choanoflagellates (protists) figure 32. 3 flagellated cells. Collar of microvilli line spongocoel ingest bacteria and any food particles figure 33. 4 (anatomy of sponge) 5. radial symmetry: diploblasts, characterized by cnidocytes. Specialized cells in tentacles function in defense and in prey capture: marine. Ex) jellies, coral, sea anemone, portuguese man of war. Lophotrochozoa - clade: characteristics, bilateral symmetry, triploblasts, phylum platyhelminthes, dorsoventrally flattened, acoelomate. 9. free living and parasitic free living - ex) planarians figure 33. 10. Parasitic - ex) tape worms figure 33. 12: phylum rotifera figure 33. 12.
