Plecoptera
It is commonly known as stonefly. Its distribution is worldwide but not yet found in Antarctica. There are 12 families in two infraorders: Euholognatha and Systellognatha (= below suborder of Arctoperlaria). There are 3 families are recorded in Hong Kong. The larvae of stoneflies are aquatic and resemble to the adults but without wings. They might possess various kinds of external gills (cervical gills, thoracic gills and anal gills).
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Nemouridae e.g. Amphinemura wui (in subfamily Amphinemurinae) Body elongate, hind legs when fully extended are sub-equal to the abdominal length |
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Perlidae e.g. Togoperla sp. Body relatively large and dorsoventrally flattened |
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Leuctridae e.g. Rhopalopsole sp. Body elongate and cylindrical, usually white or yellow |