Smooth Spider Beetle

Scientific Name: Gibbium aequinoctiale

Order & Family: Order Coleoptera, Family Ptinidae

Size: 2mm to 3.5mm (approx. 1/8 inch)

Smooth Spider Beetle

Natural Habitat

Often found in old buildings, granaries, warehouses, and homes; they prefer dark, damp locations.

Diet & Feeding

Scavengers that feed on organic matter including dried animal products, seeds, grain, leather, and wool.

Behavior Patterns

Nocturnal and slow-moving; they are flightless and often mistaken for spiders or ticks due to their globular bodies and long legs.

Risks & Benefits

They do not bite humans or transmit diseases but are considered a nuisance pest as they can contaminate stored food products and damage fabrics.

Identified on: 4/14/2026