Plaster Bagworm (or Household Casebearer)

Typically found inside homes, especially in humid climates like Florida or tropical regions. They frequent closets, bathrooms, and underneath furniture where they can attach to walls or flooring.

The larvae feed on keratin and detritus, including spider webs, wool, hair, dead insects, old cocoon shells, and lint.

The larva builds a flattened, watermelon-seed-shaped case out of silk and debris (like sand or paint fragments) which it drags around. It has slit-like openings at both ends, allowing the larva to feed from either side without turning around.

Generally harmless to humans (they do not bite or sting) but are considered a nuisance pest. They can cause minor damage to woolen fabrics, rugs, or furs if populations are large, though they primarily feed on debris.