Order:
Larvae: Wings/wing pads absent. Eye spots present, but compound eyes absent. Antennae usually small, inconspicuous. Three pairs of segmented legs present on thorax. Pair of anal prolegs, each with single hook, located on last abdominal segment. Larvae can be free-living, in silken retreats attached to substrate, or in usually-portable tubes or cases made of sand, rocks, or plant material.
Family:
The larva lives in a papoose-shaped case of fine sand grains on tops of rocks; its tiny antennae are halfway between the eyes and the mouthparts; the mandibles lack teeth; the tops of the first two thoracic segments are covered by sclerites; the top of the third thoracic segment (metanotum) is hairy and usually lacks sclerites near the midline; anal prolegs are mostly fused with the end of the abdomen except their apical hooks.