Rotifera (n.)youdaoicibaDictYouDict[Rotifera 词源字典]
class of microscopic freshwater organisms, 1830, Modern Latin, from Rotifer (Leeuwenhoek, 1702), from Latin rota "wheel" (see rotary) + -fer "bearing" (see bear (v.)). The animalcules use rotary organs to swim about.[Rotifera etymology, Rotifera origin, 英语词源]