white-marked spider beetle

The white-marked spider beetle (Ptinus fur) is a type of spider beetle, which are insects belonging to the family Ptinidae. These beetles are characterized by their globular bodies, long, thin legs, and lack of wings. They typically range in color from reddish-brown to black and measure between 1 to 5 mm in size.1

Spider beetles are found worldwide and inhabit various environments, including stored food products, plant and animal remains, dry wood, and museum specimens. The white-marked spider beetle and the shiny American spider beetle (Mezium americanum) are considered household pests in North America. Larvae of these beetles feed on materials like woolen goods, fur, feathers, flour, and seeds.12