Plaster Bagworm (or Household Casebearer)

Typically found indoors in dry areas, hanging on walls, ceilings, baseboards, or underneath furniture. They are common in humid climates like Florida.

The larvae feed on detritus, cobwebs, old spider webs, wool, and other natural fibers found in household dust.

The larva constructs a protective case (visible in the image) from silk and debris like sand, soil, and insect parts. It drags this case around as it moves. It is shaped like a pumpkin seed or a flattened spindle, with openings at both ends so the larva can turn around inside.

They are generally considered a nuisance pest rather than dangerous. They do not bite or sting humans. However, in large numbers, they may damage fabrics like wool or silk.