Household Casebearer (often confused with the Plaster Bagworm or Case-bearing Clothes Moth)
Scientific Name: Phereoeca uterella (or potentially Tinea pellionella for close relatives)
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 plastered walls, in closets, under furniture, or in humid environments like bathrooms and garages. They originate in tropical and subtropical climates.
Diet & Feeding
The larvae feed on keratin found in natural fibers like wool, silk, hair, and fur, as well as spider webs, dead insects, lint, and occasionally dried food products.
Behavior Patterns
The larva constructs a protective, flattened, pumpkin-seed-shaped case out of silk and environmental debris (dust, sand, fibers). It drags this case around as it moves and can retreat inside when threatened. They are known for climbing walls to pupate.
Risks & Benefits
Generally harmless to humans (no biting or stinging). However, they are considered pests because the larvae can damage clothing, rugs, and upholstery made from natural fibers. They do not damage structural wood or plaster, despite the name 'Plaster Bagworm'.
Identified on: 3/4/2026