14 - 2/14 Bivalves 3 chambered heart, autorhythmic (like...

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2/14 Bivalves 3 chambered heart, autorhythmic (like humans), circulates book through simple  circulatory system, pressure generated by circulatory system – modification in  osmoregulatory system Foot – modified to dig, project into substrate, expansion of foot, use muscles to pull  themselved into the substrate, many sit inside substrate because its easier to get  food  Reproduction – separate sexes, fertilization external, eggs and sperm exit into water  through excurrent siphon (many get eaten by others) Larval forms – only mobile form, cilliated, move in water current, settle on bottom and  morph into bivalve structure Cephalopods  (carnivores, no filter feeders) Foot highly modified, not obvious Shell usually absent (except in nodulous), some have internal shell  Most complex mollusk o High metabolic rate o Sensory system/brain is large – engage in complex behaviors/learning  Nodulous  o
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This note was uploaded on 05/20/2008 for the course BIOL 303 taught by Professor Birchard during the Spring '08 term at George Mason.

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14 - 2/14 Bivalves 3 chambered heart, autorhythmic (like...

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