Assertion: nymph | /r/CapableOf | form so-called mask
Facets:
Source sentences:
text: The nymphs are voracious predators and feed by means of a flat labium (a toothed mouthpart on the lower jaw) that forms the so-called mask; it is rapidly extended to seize and pierce the Daphnia (water fleas), mosquito larvae, and other small aquatic organisms on which damselfly nymphs feed.