March 31 notes - Key features o Mantle secrets the shell o...

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31/03/2008 09:29:00 Annelida: Segmented Worms Earthworms, clam worms, fan worms, leeches Triploblastic structure (coelomate) True segments (somites) Classes o Oligochaeta (Few hairs) Reduced head, absence of parapodia, few setae Earthworms o Polychaeta (many hairs) Obvious head, parapodia , many setae Fanworms o Hirudinea Reduced segmentation, absence of setae, 2 suckers Leaches Mollusca Chitons, Snails, Slugs, Clams, Squids, Octopuses Triploblastic structure (coelomate) Open circulatory system o Except the octopus class o Respire via gills, lungs, mantle, body surface
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Unformatted text preview: Key features o Mantle secrets the shell o Foot usually for movt o Radula feeding apparatus Highly Developed nervous system o Especially the octopus class o Octopus class has largest brain of any invertebrate 4 classes o Polyplacophora (many plates) Radula to eat algae Chitons o Gastropoda (stomach foot) Radula to eat algae and flesh Some have shells limpet, snail Some do not slug o 31/03/2008 09:29:00 31/03/2008 09:29:00...
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March 31 notes - Key features o Mantle secrets the shell o...

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