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March 31 notes - • Key features o Mantle – secrets the...

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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...

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