Household Casebearer (often confused with Plaster Bagworm)
Scientific Name: Phereoeca uterella (or sometimes Tinea pellionella for Casemaking Clothes Moth)
Order & Family: Order: Lepidoptera, Family: Tineidae
Size: Larval case is typically 8-13 mm long (approx. 0.3-0.5 inches)
Natural Habitat
Commonly found indoors on walls, in corners, on wool rugs, in closets, and underneath furniture where dust accumulates. They prefer humid environments.
Diet & Feeding
The larvae feed on keratin found in natural fibers (wool, silk), hair, pet fur, spider webs, and dead insects.
Behavior Patterns
The larva constructs a flattened, pumpkin-seed-shaped case out of silk and debris (sand, dust, fibers) which it drags around as protection. It can poke its head out from either end to move or feed.
Risks & Benefits
Risks: Household pest that can damage clothing, rugs, and upholstery made of natural fibers. Generally harmless to humans health-wise (they do not bite or sting). Benefits: None significant in a household setting, though they clean up small amounts of organic debris.
Identified on: 3/7/2026