Humpless casemaker caddisfly larvae are characterized by a 'humpless' first abdominal segment. The portable case is made from strips of organic material which is typically rounded and tube-like; several genera build square, four-sided cases. The "humpless" caddisfly lives where the currents are consistently swift, and are often found anchored to rocks at the heads of riffles.
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.
The larva lives in a case that is square or round in cross-section and usually made of plant pieces that are mostly transversely oriented; the tops of the first two thoracic segments are covered by sclerites; the top of the third thoracic segment has only a few small sclerites; the dorsal and pair of lateral spacing humps (usually present on the first abdominal segment of case-making caddisflies) are absent; anal prolegs are mostly fused with the end of the abdomen except their apical hooks.
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