Nymph with mask-like labium below chewing mouthparts. Wings developing in wing pads. Segmented legs present, each with two claws.
Suborder Zygoptera (i.e., damselflies: as shown by slender body shape, head wider than thorax and abdomen; 3 long feather-like gills present at posterior end of abdomen). First antennal segment long, each subequal to length of rest of its antenna. Labial mask with deep, open, diamond-shaped, median cleft at apex. Lateral gills at posterior end of abdomen triangular in cross section.