Long-bodied cellar spider (likely)

Dark, sheltered indoor areas such as corners, basements, garages, and window recesses; also found in caves and protected outdoor structures.

Predatory, feeding on flies, mosquitoes, ants, mites, and other spiders caught in its irregular web.

Builds loose, tangled webs and often vibrates rapidly when disturbed, becoming difficult to see. Females carry a small egg bundle in their jaws; several generations may occur annually indoors.

Harmless to people and not medically significant. Beneficial as a household predator of nuisance insects and other spiders; the photograph’s markings could also indicate a related cellar-spider species.