mikroskoopiliste hõljumivähkide selts (või alamklass), a subclass of Crustacean comprising minute aquatic forms abundant in both fresh and salt waters and including the Eucopepoda of which the members are chiefly free-living and important as fish food and the order Branchiura which is parasitic on the skin and gills of fish, sous-classe de Crustacés inférieurs de petite taille, le plus souvent libres, parfois parasites, веслоногие рачки (отряд Copepoda, подкласс Maxillopoda), составляющие значительную часть пресноводного и морского планктона