Household Casebearer (often referred to as a Plaster Bagworm or Case-bearing Clothes Moth larva)
Scientific Name: Phereoeca uterella (often confused with Tinea pellionella)
Order & Family: Order: Lepidoptera, Family: Tineidae
Size: The case is usually 8–13 mm (0.3–0.5 inches) long.
Natural Habitat
Typically found indoors in dry environments, often on walls, baseboards, carpets, and inside closets. They thrive in warm, humid climates like Florida.
Diet & Feeding
Detritivores feeding on old spider webs, wool, hair, fur, lint, and dead insects.
Behavior Patterns
The larva constructs a protective case out of silk and debris (sand, dust, lint) which is shaped like a flattened pumpkin seed. It drags this case around as it moves. Before pupating, they often crawl up vertical surfaces like walls.
Risks & Benefits
Generally harmless to humans (they do not bite or sting). However, they are considered a minor pest because they can damage woolen fabrics, rugs, and clothing. They can benefit the ecosystem by cleaning up detritus like old spider webs.
Identified on: 2/25/2026