29_Ward_Mollusca_Outline

29_Ward_Mollusca_Outline - BIS2C W2011 Mollusca...

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BIS2C W2011 Lecture 29 (28 February 2011) 1 Mollusca Characteristics Bilaterally symmetrical (secondarily asymmetrical) coelomate protostomes with following features… complete gut reduced coelom open circulatory system characteristic body plan: mantle, visceral mass, and foot mouth with radula well developed nervous system and excretory system Foot: large ventral muscle mass (modified ventral body wall) Mantle: fold of tissue covering visceral mass and enclosing mantle cavity (dorsal body wall) Visceral mass: body proper Modifications to generalized molluscan body plan Chitons (shell plates and repeated gills) Gastropods (torsion) Bivalves (burrowing foot) Cephalopods (arms/tentacles + siphon for propulsion) Molluscan biology ~100,000 living species (70,000 fossil species) range in size from microscopic to very large mostly aquatic; a few terrestrial herbivores, detritivores, carnivores, filter feeders, parasites Reproduction mostly dioecious (separate sexes), some hermaphrodites
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This note was uploaded on 03/09/2011 for the course BIS 2 taught by Professor Coolprof during the Spring '11 term at Bank Street College of Education.

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29_Ward_Mollusca_Outline - BIS2C W2011 Mollusca...

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