Distinguish between Amphids and Phasmids?

Amphids and phasmids are present in nematodes as sense organs. Amphids: These are the cuticular depressions present on the lips surrounding the mouth in nematodes such as Aphasmidia animals and serve as Chemoreceptors. Phasmids: These are the well developed sensory organs and they occur in some nematodes such as phasmidia animals.