Distinguish between amphids and phasmids.
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Phasmids are unicellular sensilia in the lateral tail region of certain species of nematodes. They are similar in their structure to amphid sensilla, but smaller. Phasmid neurons were recently shown to function in modulation of chemorepulsion behavior.
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PHASMIDS; phasmids are present in nematodes. they are actually a unicellular sensilia used to detect or sense various chemicals. they have structural resemblance with amphids but they are small in size.
AMPHIDS; amphids are present in nematodes. they are actually pointed inverted invagination present in cuticle of organisms. amphids are larger in size as compared to phasmids. they are used as an olfactory organ in nematodes.
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