Smooth Spider Beetle

Scientific Name: Gibbium aequinoctiale

Order & Family: Coleoptera; Ptinidae

Size: 1.5 to 3.5 mm in length

Smooth Spider Beetle

Natural Habitat

Typically found in pantries, warehouses, museums, and attics where they scavenge specialized organic matter.

Diet & Feeding

Scavenger of dry organic materials including grain, dried fruit, flour, animal droppings, and silk.

Behavior Patterns

Primarily nocturnal and active in dark, damp locations. They are flightless and often mistaken for spiders or bed bugs due to their rounded abdomen and long legs.

Risks & Benefits

They are considered a minor domestic pest because they can contaminate stored food products, but they do not bite humans or pets and carry no known diseases.

Identified on: 3/12/2026