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Ch 9 Life Science A

Animals Without Backbones

TermDefinition
vertebrate animal with a backbone
endoskeleton skeleton inside the body
invertebrate animal without a backbone
exoskeleton skeleton on the outside of the body
pores tiny openings
poriferan invertebrate animal with pores
spicule small, hard, needlelike structure of a sponge
cnidarian invertebrate animal with stinging cells and a hollow central cavity
polyp cuplike form of a cnidarian
medusa umbrella-like form of a cnidarian
platyhelminth type of worm with a flattened body
parasite organism that gets its food by living on or in the body of another organism
nematode type of worm with a round body
annelid type of worm with a segmented body
setae tiny, hairlike bristles
closed circulatory system organ system in which blood moves through vessels
mollusk soft-bodied organism
mantle thin membrane that covers a mollusk's organs
radula tough, tonguelike organ of a snail
Created by: cpasteris
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