Bug Identifier
False Widow Spider
Community identification

False Widow Spider

Steatoda grossa

Order & Family
Araneae: Theridiidae
Size
Females range from 6 to 10 mm in body length; males are smaller, ranging from 4 to 6 mm.
See this bug in the Encyclopedia

Natural Habitat

Commonly found indoors in dark corners, cupboards, basements, and garages; also outdoors in sheltered spots like hollow trees or under rocks.

Diet & Feeding

Carnivorous; feeds primarily on other insects, woodlice, and occasionally other spiders by trapping them in messy, tangled cobwebs.

Behavior Patterns

Mainly nocturnal; they are known for building irregular web structures. They are generally shy and will retreat if disturbed, rarely biting unless squeezed or threatened.

Risks & Benefits

Benefits include natural pest control. While they can bite, the venom is not medically significant for most humans, typically causing localized pain and minor swelling similar to a bee sting.