Smooth Spider Beetle

Scientific Name: Gibbium aequinoctiale

Order & Family: Order: Coleoptera, Family: Ptinidae

Size: 1.5 to 3.5 mm in length

Smooth Spider Beetle

Natural Habitat

Typically found in pantries, warehouses, museums, and attic spaces where they scavenge in dark, damp crevices.

Diet & Feeding

Scavenger of organic matter including dried food products, seeds, grain, dried plant material, wool, silk, and animal droppings.

Behavior Patterns

Active at night (nocturnal); they are slow-moving and often mistaken for spiders due to their globular bodies and long legs. They cannot fly.

Risks & Benefits

Generally considered a nuisance pest rather than a health threat. They do not bite or sting, but they can contaminate stored food products and damage museum collections.

Identified on: 4/14/2026