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Noun1.Zygnemales - pond scums; desmids
animal order - the order of animals
Chlorophyceae, class Chlorophyceae - algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments
family Zygnemataceae, Zygnemataceae - pond scums: common freshwater algae forming green slimy masses