
Community identification
False widow spider
Steatoda grossa (likely)
- Order & Family
- Araneae; Theridiidae (cobweb spiders)
- Size
- Adult females typically 6–10 mm in body length; males are smaller and slimmer.
Natural Habitat
Common indoors and around buildings, especially in sheltered corners, window frames, sheds, and garages; native to warmer regions but widely introduced.
Diet & Feeding
Predatory, capturing flies, mosquitoes, ants, and other small arthropods in a tangled cobweb.
Behavior Patterns
Mostly nocturnal and sedentary; it retreats when disturbed and can remain in the same web for long periods. Females produce several silk egg sacs and may live for multiple years.
Risks & Benefits
Its bite is uncommon and usually causes localized pain, redness, or swelling; medically serious effects are rare. It is beneficial as a household pest predator.