Smooth Spider Beetle

Scientific Name: Gibbium aequinoctiale

Order & Family: Order: Coleoptera, Family: Ptinidae

Size: 2.0 to 3.5 mm in length

Smooth Spider Beetle

Natural Habitat

Commonly found indoors in structures, warehouses, granaries, and museums where they prefer dark, damp locations.

Diet & Feeding

Scavengers that feed on a wide variety of dried organic materials including flour, seeds, cereal, spices, animal droppings, and dried insects.

Behavior Patterns

Primarily nocturnal and slow-moving; they have a globose, shiny appearance resembling a large mite or spider and cannot fly.

Risks & Benefits

While they do not bite or pose a direct health risk to humans or pets, they are considered pests as they can contaminate and damage stored food products and natural history specimens.

Identified on: 6/30/2026