Yellow Sac Spider
Scientific Name: Cheiracanthium inclusum
Order & Family: Araneae: Cheiracanthiidae
Size: 5 - 10 mm in body length
Natural Habitat
Indoors behind furniture, in corners, or outdoors in trees and shrubs.
Diet & Feeding
Small insects and other spiders, including fellow sac spiders.
Behavior Patterns
Nocturnal hunters that do not build webs for prey; they create small silk 'sacs' for resting during the day.
Risks & Benefits
Benefits the ecosystem by controlling pest populations; its bite can be painful and cause swelling but is generally not medically significant.
Identified on: 2/19/2026