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Unformatted text preview: and Phylum Annelida were examined in Part 1 of Kingdom Animalia). Phylum Mollusca Molluscs are bilateral, eucoelomate protostomes which lack segmentation, and have bodies composed of a muscular foot (used for locomotion or food capture), visceral mass (which contains the organ systems), mantle ( a soft tissue that secretes the shell) mantle cavity (where gills and excretory organs are located), and calcareous shell . Most species are marine and possess a radula (a rasping organ in the mouth used to scrape up food). Class Polyplacophora (chitons) Primitive marine molluscs with typically 8 overlapping shell plates along the dorsal midline. Note how the foot is used as a suction cup to adhere to rocks. Chitons feed by using their radula to scrape algae from the surface of rocks. The mantle cavity is a groove between the foot and the edge of the mantle. Find the gills in this groove....
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This note was uploaded on 12/27/2011 for the course BSC 1020 taught by Professor Danmoon during the Fall '11 term at UNF.
- Fall '11