Assertion: mayfly's stage | /r/Synonym | naiad
Facets:
Source sentences:
text: Their immature stages are aquatic fresh water forms (called "naiads" or "nymphs"), whose presence indicates a clean, unpolluted environment.
text: The immature stage of the Mayfly (called the “Naiad”) usually spends a year or so in the aquatic environment where the majority of species feed on algae or diatoms.