Spotted Orb-Weaver, Barn Spider
Neoscona crucifera
Family Araneidae (Orb-Weavers), Order Araneae. Characterized by their sturdy build, hairy or spiny legs, and ability to spin complex vertical orb-shaped webs.
Physical Description
Robust body with a clearly distinct cephalothorax and a large, bulbous abdomen. Females are notably larger and rounder than males. The visible underside shows vibrant red-orange tones with distinctive dark markings and a pale-rimmed black spot near the spinnerets.
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 3 to 4 cm. This specimen appears to be a mature adult.
Coloration & Markings
The underside displays a striking bright orange-red coloration on the sternum and coxae, contrasting with dark reddish-brown legs banded in stark black and white rings. The ventral abdomen features dark patches surrounding a characteristic yellow or pale horseshoe-shaped or circular marking near the rear.
Web Type
Vertical orb web constructed with sticky spiral threads and a non-sticky hub. Typically built late in the day or evening in high-traffic insect areas, often spanning between vegetation, porches, or structural walls.
Eye Arrangement
Eight eyes arranged in two distinct rows: a prominent anterior median pair and lateral pairs grouped closely together on tubercles, typical of the Araneidae family.
Leg Characteristics
Long and robust legs featuring strong spines and prominent dark brown/black and white contrasting bands. The legs are typically held in a splayed, ready posture on the web.
Venom & Safety Information
Venom Information
Neurotoxic/cytotoxic venom optimized for immobilizing invertebrate prey. It is low in potency regarding humans.
Medical Significance
Not medically significant. A bite may cause minor localized pain, redness, or swelling similar to a mosquito sting, but they are entirely harmless to humans and domestic pets.
Safety Recommendations
No special precautions needed. If found near a doorway, they can be gently relocated using a cup and piece of cardboard.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly in the eastern and central regions. Prefers gardens, forest edges, meadows, and human-made structures like wooden fences, porches, and barns where outdoor lighting attracts prey.
Behavior & Temperament
Nocturnal web-builders that often hide in a retreat or sit quietly at the hub of the web during the night, retreating to nearby crevices or foliage during daylight hours. Generally docile and reluctant to bite.
Diet & Prey
Primarily feeds on flying insects including moths, beetles, mosquitoes, and flies captured in its vertical orb web.
Seasonal Activity
Most active during late summer and autumn when adults reach full size and construct webs near outdoor lights to capture abundant mating insects.
Description
The Spotted Orb-Weaver is a stunning master builder of the night garden. With its vibrant orange hues and striking leg banding, it hangs patiently in its intricate wheel-shaped web awaiting unsuspecting flying insects. While formidable to moths and beetles, it is a peaceful neighbor to humans.
Key Features
Bright orange-red underside, distinctive pale horseshoe or circular marking near the spinnerets on the ventral abdomen, and heavily banded legs.
Similar Species
Other orb-weavers such as Neoscona domiciliorum (Red House Spider) or Araneus diadematus (Cross Orb-Weaver), distinguished by differing dorsal patterns and ventral coloration nuances.
Life Cycle
Females construct silken egg sacs in sheltered locations during autumn, laying hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning before growing through multiple molting stages over a single season.
Ecological Importance
Serves as an effective natural pest control agent by consuming large quantities of flying agricultural and household insect pests.
Conservation Status
Secure and widespread; highly adaptable to suburban environments.
Interesting Facts
Many orb-weavers consume their own web nightly to recycle proteins before spinning a fresh one just before dusk.
Photography Tips
Use a macro lens with a flash or diffused lighting to highlight the bright ventral colors and leg banding patterns against dark foliage backgrounds.
Identified: 2026-09-12T12:41:48.067900