Spotted Orb-Weaver, Barn Spider
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical wheel-like webs, possessing eight similar-sized eyes arranged in two rows, and often featuring a bulky, rounded abdomen specialized for producing multiple types of silk.
Physical Description
The spider has a robust, rounded, bulbous abdomen that overhangs the cephalothorax, typical of female orb-weavers. The cephalothorax is relatively compact and covered in fine, hair-like setae. The overall texture is somewhat matte, providing camouflage against bark and building surfaces.
Size Estimate
Body length is approximately 10 to 18 millimeters for adult females, with a leg span reaching up to 30 to 40 millimeters. This specimen appears to be a mature or nearly mature adult female.
Coloration & Markings
Displaying earthy tones ranging from yellowish-brown, reddish-brown, to grayish-tan. The abdomen typically features a somewhat indistinct central folium pattern with subtle darker margins and occasional light spots, blending exceptionally well with wooden structures and tree bark.
Web Type
Builds a classic large, vertical orb web consisting of sticky spiral threads and a non-sticky structural frame. These webs are typically constructed in the evening across open spaces, doorways, porches, or between tree branches, and are often taken down and rebuilt nightly.
Eye Arrangement
Consists of eight small eyes arranged in two horizontal rows on the anterior portion of the cephalothorax, typical for the Araneidae family, aiding in light detection and basic movement tracking.
Leg Characteristics
Legs are moderately long and robust, clearly marked with dark brown or black banding against a lighter background. They feature numerous spines and are typically held spread out widely when resting in the center of the web or tucked tightly when disturbed.
Venom & Safety Information
Venom Information
Possesses mild neurotoxic venom utilized to immobilize small invertebrate prey. It is not considered medically significant to humans or large pets.
Medical Significance
Harmless to humans. A defensive bite is exceedingly rare, typically resulting in only minor, temporary localized pain, slight redness, or swelling comparable to a mild mosquito bite, requiring no special medical treatment.
Safety Recommendations
No special control measures are necessary since they are beneficial and harmless. If relocation is desired, gently guide the spider into a container using a piece of cardstock and release it into nearby garden foliage.
Habitat & Behavior
Habitat & Range
Common throughout North America, particularly in eastern and central regions. Prefers woodland edges, gardens, and human-made structures such as porches, barns, and exterior walls where outdoor lighting attracts nighttime flying insects.
Behavior & Temperament
Nocturnal web-weaver that usually spends daylight hours resting quietly at the edge of the web in a retreat or hanging head-down in the hub. They are docile, non-aggressive, and will only attempt to bite if tightly trapped or roughly handled.
Diet & Prey
Feeds primarily on flying nocturnal insects including moths, beetles, mosquitoes, and flies caught in its vertical orb web. Prey is quickly immobilized by being wrapped in silk before venom is injected.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach their maximum size, build large webs, and prepare egg sacs before dying off with the first hard freezes.
Description
The Spotted Orb-Weaver is a familiar and welcome nighttime architect around homes and gardens. With its rounded, earthy-toned body and expertly crafted wheel-shaped web, this master pest controller performs an invaluable service by reducing flying insect populations around human habitations.
Key Features
Distinguished by a bulky, rounded brownish abdomen, prominently banded legs, placement in a vertical orb web, and a general preference for hanging out near outdoor lights or wooden structures during the late summer and autumn months.
Similar Species
Can be confused with other orb-weavers such as Neoscona domiciliorum (the Red-femured Spotted Orb-Weaver) or Araneus diadematus (the European Garden Spider, which features a distinct white cross marking on the abdomen).
Life Cycle
Females construct protective silken egg sacs in sheltered crevices during autumn, depositing hundreds of eggs inside. Spiderlings hatch the following spring, dispersing via ballooning to start independent lives, reaching maturity by late summer.
Ecological Importance
Acts as a prolific natural predator of flying insects, helping to control populations of garden pests, agricultural insects, and disease vectors like mosquitoes.
Conservation Status
Not evaluated by the IUCN, but populations are widespread, stable, and highly adaptable to human-altered environments.
Interesting Facts
Many orb-weavers consume their entire web each morning before dawn to recycle the proteins in the silk, resting during the day before spinning a fresh web the following evening.
Photography Tips
Use a macro lens or smartphone macro setting with a ring light or diffused flash to capture the intricate details of the abdominal patterns and banded legs. Evening or early morning provides the best contrast when the spider is stationary in its web.
Identified: 2026-08-22T15:59:20.816614