Order:
Caterpillars with wings and wing pads absent. Eye spots usually present, but compound eyes absent. Short segmented legs present on thorax, not as long as abdomen. Underside of abdomen with several pairs of prolegs (fleshy nubs) with tiny hooks.
Family:
Ventral prolegs present on abdominal segments 3, 4, 5, 6, and 10. Segmented thoracic legs present. Gills sometimes present on sides of abdomen. Prolegs with crochets (tiny hooks) in transverse ellipses or bands.