Spotted Orb-Weaver, Barn Spider
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae
Physical Description
Robust, hairy body with a distinct oval-to-triangular abdomen that may feature slight shoulder humps, and a narrower, hairy cephalothorax. The anatomy is typical of large orb-weavers designed for web construction and vibration detection.
Size Estimate
Body length ranges from 9 to 19 millimeters, with females being notably larger than males; total leg span can reach up to 40 to 50 millimeters. This specimen appears to be an adult or sub-adult female.
Coloration & Markings
Variable coloration ranging from light yellowish-brown to reddish-brown or dark brown. The abdomen features a mottled pattern, often with a central leaf-like folium marking and light spots or dark chevron patterns.
Web Type
Vertical orb web constructed at night, featuring a sticky spiral and non-sticky support threads, typically placed in gardens, near porch lights, or among tall vegetation.
Eye Arrangement
Eight small eyes arranged in two horizontal rows on the front of the cephalothorax, typical of the orb-weaver family with slightly separated lateral eyes.
Leg Characteristics
Long, moderately thick legs with prominent, dark spines and alternating light and dark banding rings. The legs are held outward to maximize surface sensitivity for detecting prey vibrations.
Venom & Safety Information
Venom Information
Neurotoxic venom tailored specifically for immobilizing insect prey. It is low in potency regarding humans and lacks any systemic danger.
Medical Significance
Harmless to humans. A bite may cause minor, localized pain, redness, or swelling similar to a mosquito bite, requiring no special medical treatment beyond basic cleaning.
Safety Recommendations
No special precautions needed. If found inside a house, gently capture it using a glass and a piece of card to release it safely into an outdoor garden.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly in eastern and central regions. Prefers gardens, woodlands, structural overhangs, and areas near human habitation where flying insects congregate.
Behavior & Temperament
Nocturnal hunter that typically hides in a retreat or sits near the hub of the web at night. Generally docile and reluctant to bite, usually dropping from the web or fleeing when disturbed.
Diet & Prey
Feeds primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and flies caught in its vertical orb web.
Seasonal Activity
Most active and visible during late summer and autumn when individuals reach maturity and females spin webs to produce egg sacs before dying off with the first hard frost.
Description
The Spotted Orb-Weaver is a familiar and beneficial garden resident known for building large, intricate circular webs overnight to catch flying insects. With its hairy legs, mottled brown coloration, and robust abdomen, it is a master architect of the night. Though large and somewhat intimidating in appearance, it is completely harmless to humans and serves as an effective natural pest controller.
Key Features
Robust hairy body, prominent spiny legs with dark banding, mottled brown coloration with a subtle abdominal folium pattern, and construction of a classic vertical wheel-shaped orb web.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a distinct white cross pattern on the abdomen, and other Neoscona species which require close examination of genitalia for definitive separation.
Life Cycle
Females produce silken egg sacs in autumn containing hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning before growing through multiple molting stages to reach maturity by late summer.
Ecological Importance
Acts as a primary biological control agent by consuming large quantities of flying agricultural and household insect pests, while serving as prey for birds and wasps.
Conservation Status
Not evaluated by the IUCN, but populations are widespread, stable, and highly adaptable to human-modified environments.
Interesting Facts
Many orb-weavers consume their entire web each morning to recycle the protein-rich silk before rebuilding a fresh one the following evening.
Photography Tips
Use macro lenses with a fast shutter speed to capture leg spination and abdominal patterns. Night photography with an off-camera flash works best when the spider is active in its web.
Identified: 2026-09-15T23:12:46.629665