Bug Identifier
Household Casebearer (often referred to as a Plaster Bagworm or Case-bearing Clothes Moth larva)
Community identification

Household Casebearer (often referred to as a Plaster Bagworm or Case-bearing Clothes Moth larva)

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.
See this bug in the Encyclopedia

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.