Cellar Spider

Natural Habitat

Commonly found indoors in basements, cellars, crawl spaces, attics, and corners of rooms. Outdoors, they can be found under rocks, in caves, or other dark, damp places.

Diet & Feeding

Mainly other insects and spiders. They are opportunistic predators and will catch whatever gets ensnared in their webs, including larger spiders like house spiders and even other cellar spiders.

Behavior Patterns

Cellar spiders are known for building irregular, messy webs in corners of rooms, basements, and other undisturbed areas. They are often seen hanging upside down in their webs. When disturbed, they may vibrate rapidly in their web, making it difficult for predators to catch them. They are generally nocturnal and reclusive.

Risks & Benefits

Generally harmless to humans. Their fangs are too small to penetrate human skin, and their venom is not considered medically significant. They can be beneficial by preying on other pest insects and spiders, including venomous species like black widows if they wander into a cellar spider's web.

Identified on: 8/13/2025