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chapter 30 vocab

QuestionAnswer
Trochophore Larval stage featured by mollusks and annelids, some are free swimming.
Visceral Mass A central section that contains the organs of a mollusks.
Mantle Outer layer tissue that is wrapped around the visceral mass like a cape.
Foot Muscular region in mollusk that is used primarily for locomotion.
Radula A rasping tongue-like organ that located in their mouth.
Nephridinium Tiny tubular structure where cilia pulls in coelomic fluid to recover molecules and remove fluid waste.
Adductor Muscles Two thick muscles that connect the valves in bivalves.
Siphon Hallow tubes where water moves down one tube over the gills and out the other tube.
Cerebral ganglion Primitive brain located in one anterior segment.
Septa Internal body walls that separates the segments of most annelids.
Setae Pairs of external bristles located on each segment to increase traction.
Parapodia Fleshy appendages where the ct are attach in some annelids.
Mollusks One of the first major groups of organisms that has a true coelom without segmented bodies. Ex: snail, slug, octopus
Gastropods Primarily a marine group of mollusks that have invaded fresh water and terrestrial habitats. Ex: snails and slugs
Bivalves Aquatic mollusks that has a compressed body within hinged shells. Ex: oysters, clams, muscles
Cephalopods The most intelligent of all invertebrates and are characterized by bilateral symmetry, large head, and tentacles. Ex: squid & octopus
Annalids Organisms that are recognized by their segments and are visible as a series of ring light structures. Ex: earthworms & leaches
Created by: ava-barnhill
 

 



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