Spotted Orb-Weaver, Barn Spider
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Characterized by building vertical wheel-like webs and having three claws on their tarsi.
Physical Description
The spider has a robust, highly rounded, bulbous abdomen that is noticeably larger than the cephalothorax. The body is covered in fine setae (hairs), giving it a slightly textured appearance. The cephalothorax is narrower and covered in dense, light-colored hairs.
Size Estimate
Body length ranges from 10 to 18 millimeters for females, with a total leg span reaching up to 35 to 40 millimeters. This specimen appears to be a mature adult female, indicated by the large, swollen abdomen.
Coloration & Markings
Base coloration varies from yellowish-brown to reddish-brown and dark brown. The large abdomen features a distinctive central pattern, often showing a leaf-like or cross-like arrangement of spots and chevrons, flanked by darker margins. The legs show noticeable dark banding.
Web Type
Builds a large, vertical orb web consisting of sticky spiral threads and non-sticky structural radii. These webs are typically constructed in the evening across open spaces, gardens, porches, or between structures, and are often taken down and rebuilt nightly.
Eye Arrangement
Arranged in two horizontal rows of four eyes each. The lateral eyes are typically placed close together on small tubercles, while the median eyes are larger and set within a dark rectangular field, characteristic of the orb-weaver family.
Leg Characteristics
Legs are robust, moderately long, and heavily spined with distinct dark and light brown or reddish banding. They are held flat or spread widely when resting on a surface or in the center of the web.
Venom & Safety Information
Venom Information
Neurotoxic venom specialized for immobilizing invertebrate prey. It is low in toxicity to humans and larger animals.
Medical Significance
Harmless to humans. A bite is rare and typically only occurs if the spider is directly pressed against the skin. Symptoms are generally limited to minor localized pain, redness, or swelling, similar to a mosquito bite.
Safety Recommendations
No special precautions needed. If found indoors, gently cup the spider under a glass and release it outdoors in a garden or wooded area.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly in eastern and central regions. Prefers habitats near human structures, gardens, woodlands, and fields where there are ample anchor points for large orb webs.
Behavior & Temperament
Crepuscular and nocturnal hunter, spending daylight hours hiding in nearby vegetation or retreats and moving to the center of the web at dusk. They are docile, non-aggressive, and will typically drop from the web or flee when disturbed.
Diet & Prey
Feeds primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and flies caught in its sticky orb web. Prey is subdued with a rapid bite and wrapped in silk before consumption.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach their maximum size and build prominent webs.
Description
The spotted orb-weaver is a magnificent and harmless garden dweller known for constructing large, intricate wheel-shaped webs at dusk. With its beautifully patterned, bulbous abdomen and reddish-banded legs, it serves as a wonderful nocturnal predator that helps manage flying insect populations around homes and gardens.
Key Features
Bulbous, heavily patterned abdomen with leaf-like markings, robust spiny legs with dark banding, and construction of large vertical orb webs.
Similar Species
Araneus cavaticus (Barn Spider) and Neoscona domiciliorum (Redlegged Orb-Weaver). Distinguished by specific abdominal folium markings and geographical range variations.
Life Cycle
Mating occurs in late summer and autumn, after which females deposit eggs in a silken sac attached to bark, walls, or protected crevices. Spiderlings emerge in spring, dispersing via ballooning, and mature by late summer.
Ecological Importance
Acts as a natural pest control agent by consuming large numbers of flying agricultural and household insect pests.
Conservation Status
Not evaluated by the IUCN, but populations are stable, widespread, and common across their natural range.
Interesting Facts
Many orb-weavers consume their entire web each morning to recycle the protein-rich silk before resting through the daylight hours.
Photography Tips
Best photographed at night using a macro lens and a diffuse flash to capture the intricate dorsal patterns and leg banding without harsh shadows.
Identified: 2026-09-21T18:09:24.168146