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Soft-bodies with short setaceous (bristle-like) antennae and
vestigial mouthparts; wings held vertically at rest, hind pair much reduced;
intercalary veins and many crossveins present; abdomen with long cerci, and with
or without a medial caudal filament; larvae (nymphs) aquatic, campodeiform
(elongated and flattened) with tracheal gills of varied form; true adult
preceded by a subimago (winged instar). |