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12 Cards in this Set

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  • Back
larval stage in many mollusks and annelids
troctophore
central section of a mollusk’s body that contains its organs
visceral mass
heavy fold of tissue that surrounds the visceral mass of mollusks
mantle
in a mollusk, muscular region used for locomotion
foot
rasping tonguelike organ of mollusks used in obtaining food
radula
tiny tubular organ of excretion that filters cellular wastes from the coelom of certain invertebrates
nephiridium
thick muscle that attaches the two valves of a mollusk and caused the shell to open and close
adductor muscle
hollow tube of bivalves used for sucking in and expelling sea water
siphon
the primitive brain contained in one anterior segment of an annelid
cerebral ganglion
internal body walls of annelids
septa
external bristles on annelids
seta
fleshy appendage of marine annelids
parapodium