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 cylindrical case, slightly curved and made of fine sand; the tops of the first two thoracic segments are covered by sclerites; the top of the third thoracic segment has a few small sclerites; there is no prothoracic horn (stiff needle between the front legs); the posterior end of the body is unusually hairy (at least 60 setae); anal prolegs are mostly fused with the end of the abdomen except their apical hooks.