Barn Spider, Spotted Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical, wheel-shaped orb webs and having eight similar-sized eyes arranged in two rows.
Physical Description
The spider has a robust, rounded abdomen typical of female orb-weavers, with a smaller cephalothorax. The body is covered in fine, dense setae giving it a somewhat hairy or velvety texture. The abdomen is bulbous and slightly pointed toward the rear.
Size Estimate
Body length is estimated around 15mm to 20mm, with a leg span reaching up to 35mm to 40mm, indicating a mature adult female.
Coloration & Markings
Muted earth tones featuring shades of brown, tan, and grey. The abdomen often displays a subtle, leaf-like folium pattern or indistinct spots, blending into wooden surfaces.
Web Type
Vertical orb web constructed at night, typically measuring up to several feet across, often built near structures, porches, and lights to catch flying insects.
Eye Arrangement
Eight eyes arranged in two rows on the anterior portion of the cephalothorax, typical of the orb-weaver family, with lateral eyes often grouped in pairs.
Leg Characteristics
Moderately long and robust legs featuring subtle dark and light banding, equipped with spines and claws used for maneuvering on webs and capturing prey.
Venom & Safety Information
Venom Information
Neurotoxic/proteolytic venom tailored for immobilizing invertebrate prey. It has low potency regarding humans.
Medical Significance
Harmless to humans. A bite may cause minor, localized pain and swelling similar to a mosquito sting, requiring no professional medical treatment.
Safety Recommendations
Leave undisturbed or gently relocate outdoors using a cup and card if found inside. Wear gloves if handling objects where they hide.
Habitat & Behavior
Habitat & Range
Commonly found throughout North America, inhabiting rural and suburban areas, gardens, barns, exterior walls, and wooded edges near artificial light sources.
Behavior & Temperament
Docile and non-aggressive. Nocturnal in its hunting habits, often hiding in a retreat or resting near the center of the web during daylight hours.
Diet & Prey
Feeds primarily on flying insects such as moths, beetles, mosquitoes, and flies caught in its vertical orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach maximum size and maturity.
Description
The Barn Spider is a quintessential autumn orb-weaver often spotted hanging near exterior lights after dark. With its heavy, rounded, brownish abdomen and patient demeanor, it serves as a master architect of the night sky, weaving intricate wheel webs to intercept unsuspecting flying insects.
Key Features
Bulbous brownish abdomen, hairy texture, nocturnal web-building habit near human structures, and typical orb-weaver body proportions.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a distinct white cross marking on the abdomen, and Neoscona domiciliorum (Red house spider).
Life Cycle
Females construct papery egg sacs in sheltered autumn crevices, containing hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning, maturing by late summer.
Ecological Importance
Acts as a natural biological control agent by significantly reducing flying insect populations around human habitations.
Conservation Status
Not evaluated by the IUCN, but populations are secure, widespread, and highly adaptable to human-altered environments.
Interesting Facts
Barn spiders frequently consume and rebuild their entire orb webs each night to recycle silk proteins and maintain sticky capture threads.
Photography Tips
Use a macro lens with a flash for night photography to highlight textural details on the abdomen, capturing the spider at eye level against its web.
Identified: 2026-09-20T16:13:03.743164