Household Casebearer (often referred to as Plaster Bagworm)
Scientific Name: Phereoeca uterella (or Tinea pellionella for the similar Case-bearing Clothes Moth)
Order & Family: Lepidoptera (Order), Tineidae (Family)
Size: Larval cases are usually 8-13 mm (0.3-0.5 inches) long.
Natural Habitat
Typically found indoors in warm, humid climates. They attach to walls, baseboards, and under furniture, particularly in areas with collected dust or spiderwebs.
Diet & Feeding
Detritivores. They feed on old spider webs, wool, hair, lint, dead insects, and other natural fibers found in household dust.
Behavior Patterns
The larva constructs a flattened, pumpkin-seed-shaped protective case out of silk and potential debris (sand, soil, fibers), which it carries around. The larva can turn around inside the case to feed from either end. It drags this 'home' along walls and floors.
Risks & Benefits
Generally harmless to humans (they do not bite or sting). However, they can be a minor pest if they feed on woolen clothing, rugs, or fabrics. They are often considered a nuisance due to their unsightly cases on walls.
Identified on: 2/15/2026