水生种类的若虫(也称为稚虫)，如蜻蜓，有鳃和其他生活于水中必需的诱发变异。
The nymphs of aquatic species (also called naiads), such as dragonflies, have gills and other modifications for an aquatic existence.
提供了蜉蝣目中国所有已知15科稚虫的检索表，并对重要检索特征进行了详细图示。
The larval key to 15 families of Ephemeroptera from China are provided. All important characters used in the key are illustrated in detail in order to facilitate using.
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