Barn Spider, Spotted Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Characterized by building vertical, wheel-like orb webs and having eight similar-sized eyes arranged in two rows.
Physical Description
Robust, hairy body with a distinctively large, bulbous, oval-shaped abdomen that slightly overhangs the cephalothorax. The legs are strong, spiny, and relatively long.
Size Estimate
Body length ranges from 9 to 19 mm for females and 8 to 13 mm for males, with a total leg span reaching up to 30 to 40 mm. This appears to be a healthy, mature adult specimen.
Coloration & Markings
Variable coloration ranging from light yellow-brown, orange-red, to dark brown or grayish. The abdomen typically features a distinct leaf-like pattern, scalloped edges, or faint spotting, often with a darker median band.
Web Type
Constructs a vertical, wheel-shaped orb web, often quite large (up to two feet across), designed to intercept flying nocturnal insects. Usually built near human structures, porches, and lights.
Eye Arrangement
Eight eyes arranged in two horizontal rows on the anterior portion of the cephalothorax, consisting of lateral pairs and a median quadrangle typical of the orb-weaver family.
Leg Characteristics
Long, robust legs featuring prominent dark and light banding, well-developed spines, and dense hairs. They are typically held in a splayed posture when resting on the web or vertical surfaces.
Venom & Safety Information
Venom Information
Neurotoxic/proteolytic venom specialized for subduing invertebrate prey rapidly. It has very low potency regarding humans.
Medical Significance
Not medically significant. Bites are extremely rare, typically occurring only if pressed directly against human skin. Symptoms are mild, limited to localized minor pain, swelling, or redness that resolves quickly.
Safety Recommendations
No special precautions needed beyond avoiding direct handling. If found indoors, gently relocate outdoors using a cup and a piece of paper.
Habitat & Behavior
Habitat & Range
Common throughout North America, particularly in eastern and central regions. Prefers anthropogenic habitats such as building exteriors, porches, barns, gardens, and wooded edges.
Behavior & Temperament
Nocturnal web-builder that often hides in a retreat or hangs head-down in the center of the web at night. Docile and non-aggressive, retreating or dropping to the ground when disturbed rather than biting.
Diet & Prey
Generalist predator feeding on flying insects including moths, mosquitoes, beetles, flies, and occasional small grasshoppers caught in its orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when adults reach maximum size, build large webs, and engage in mating before dying off with the first hard frosts.
Description
The Barn Spider is a familiar and beneficial nocturnal neighbor, frequently spotted hanging in its large, intricate orb web near outdoor lights. With its warm reddish-brown tones and bulbous patterned abdomen, it is a quintessential orb-weaver that brings natural pest control to homes and gardens.
Key Features
Large bulbous abdomen, distinctive leaf-like or spotted abdominal markings, hairy and banded legs, and the construction of a large vertical orb web near human structures.
Similar Species
Cross Orb-Weaver (Araneus diadematus) which features a distinct white cross pattern on the abdomen, and other Neoscona species which require close microscopic examination of genitalia for definitive separation.
Life Cycle
Females construct silken egg sacs in sheltered crevices or foliage in autumn, laying hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning. They undergo multiple molts to reach maturity by late summer.
Ecological Importance
Acts as an effective natural pest control agent by consuming large quantities of flying agricultural and household insect pests, while serving as prey for birds and wasps.
Conservation Status
Secure and widespread, with stable populations benefiting from human structures that provide artificial lighting and web attachment sites.
Interesting Facts
Barn spiders frequently consume and rebuild their entire orb webs every single night to recycle silk proteins and clear out damaged sticky threads.
Photography Tips
Photograph at night using a flash or off-camera lighting to highlight the intricate web details and capture the spider in its active web-weaving posture from a safe, close angle.
Identified: 2026-09-17T22:34:01.886422