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Unformatted text preview: -torsion: mantle rotates 180 degrees bringing anus over the mouth -univalve -freshwater snails evolved from terrestrial snails, so they still have to come to the surface to breathe air-marine nudibranches: no shell, benthic, feed on cnidarians and sponges-terrestrial gastropod example: slug: shell less, taste buds and primitive eyes, mucus used for attachment -abalome: opening on sides, low on food chain-bivalves clams, etc. 20000 species sessile-lost radula, reduced head, mostly filter feeders, gills used for respiration and feeding, foot used to dig into sand/sediment, ability to filter the water of light pollution-tridacna giant clams (5 feet), cultured for food-polyplacophora chitons 1000 species -flattened, shell of 7-8 plates: hinged, attached to rocks, grazing on algae...
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This note was uploaded on 11/11/2009 for the course BIS 1b taught by Professor Kimsey during the Fall '08 term at UC Davis.
- Fall '08