
Community identification
False Black Widow
Steatoda grossa
- Order & Family
- Araneae: Theridiidae
- Size
- Females range from 6 to 10.5 mm in body length; males are smaller at 4 to 6 mm.
Natural Habitat
Commonly found in and around human dwellings, basements, crawl spaces, and dark corners of gardens or sheds.
Diet & Feeding
Carnivorous; feeds on a variety of crawling insects, including woodlice, crickets, and occasionally other spiders.
Behavior Patterns
They are nocturnal cobweb-weaving spiders that hang upside-down in irregular webs. They have poor eyesight and rely on vibrations to locate prey.
Risks & Benefits
Generally beneficial for pest control as they eat common household insects. While they can bite humans if handled, their venom is not medically significant like a true black widow, typically causing localized pain and minor swelling.