Nymph with mask-like labium below chewing mouthparts. Wings developing in wing pads. Segmented legs present, each with two claws.
Zygoptera (slender body shape with head wider than thorax and abdomen, and with 3 long feather-like gills at posterior end). Antennal segment 1 much shorter than rest of its antenna. Pair of lobes at distal end of labral mask each with 0–6 setae, but attached moveable hook without setae. Ligula (distal part of palm of mask) usually without median cleft, mask roughly triangular or square (not stalked as in Lestidae). Each side of median line with either 0, 1, or 3–5, dorsal premental setae (hairs inside the palm of the mask). Mature larvae 13–25 mm long.