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OpenStudy (anonymous):

could the spines of tube feet of sea urchins be considered setae?

OpenStudy (anonymous):

The word seta derives from the Latin word for bristle. What do you think? Do either spines or tube feet resemble bristles?

OpenStudy (blues):

Calliope is right: the setae on segemented worms and spines on echinoderms both stick out of organisms but they have different structural characteristics and different functions. Setae are basically sensory; spines are for protection.

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