Spotted Orb-Weaver, Barn Spider
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae
Physical Description
The spider exhibits a robust, swollen oval-shaped abdomen typical of female orb-weavers, with a smaller cephalothorax. The body appears slightly hairy or bristled under close inspection, and females are noticeably larger and more bulbous than males.
Size Estimate
Body length ranges from 9 to 19 millimeters for females, with a total leg span reaching up to 30 to 40 millimeters. This appears to be a mature or near-mature female specimen.
Coloration & Markings
Coloration varies widely from light beige, yellow-brown, to reddish-brown or dark grey. The abdomen often features a distinct leaf-like or scalloped pattern, sometimes with a cross or spotted markings along the dorsal surface, though lighting from the nearby lamp obscures finer details.
Web Type
Builds a classic vertical orb web featuring a sticky spiral and radial threads. These webs are typically constructed in the evening near porch lights, eaves, or gardens to intercept flying nocturnal insects attracted to illumination.
Eye Arrangement
Eight eyes arranged in two rows of four, with the lateral eyes often paired on tubercles and the median eyes set on a raised quadrangle, typical of the Araneidae family.
Leg Characteristics
Long and moderately thick legs with distinct dark and light banding, bearing spines and specialized claws used for manipulating silk and navigating the vertical orb web while hanging upside down.
Venom & Safety Information
Venom Information
Possesses mild neurotoxic venom designed to immobilize small insect prey quickly. It is not potent or medically significant to humans.
Medical Significance
Harmless to humans. A defensive bite may cause localized minor pain, redness, or swelling similar to a mosquito bite, but they are extremely reluctant to bite.
Safety Recommendations
No special safety measures are required. If relocation is necessary, gently guide the spider into a container using a piece of cardstock and release it into nearby garden foliage.
Habitat & Behavior
Habitat & Range
Found commonly throughout North America, particularly east of the Rocky Mountains. Prefers wooded edges, gardens, and human structures such as porches, exterior walls, and eaves where artificial lights attract prey.
Behavior & Temperament
Nocturnal web-weaver that often retreats to a nearby hiding spot or sits tightly in the hub of the web during the night, remaining docile and non-aggressive toward humans unless trapped or directly squeezed.
Diet & Prey
Carnivorous generalist feeding on flying insects including moths, beetles, mosquitoes, and flies captured in its vertical orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when adults reach full size and construct prominent webs near lights.
Description
The Spotted Orb-Weaver is a familiar nocturnal guest around homes during late summer and autumn. With its bulky, patterned abdomen and fondness for building large webs near outdoor lighting, it acts as a beneficial and fascinating master architect of the night garden.
Key Features
Bulbous, patterned abdomen, large orb-weaving habits near lights, nocturnal presence, and distinctive banded legs.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a more distinct white cross pattern, and Neoscona domiciliorum (Red-legged Orb-Weaver), which has brighter reddish leg banding.
Life Cycle
Annual life cycle where mating occurs in late summer or autumn. Females produce papery silk egg sacs hidden in protected crevices, and spiderlings emerge in spring after overwintering.
Ecological Importance
Serves as an important natural pest control agent by consuming large quantities of flying insects and provides a food source for birds and small mammals.
Conservation Status
Not evaluated by the IUCN, but populations are widespread, stable, and highly abundant.
Interesting Facts
These spiders often consume and rebuild their entire orb web every single day to maintain the sticky silk's adhesive efficiency.
Photography Tips
Use a macro lens with a flash or external fill light to counteract the strong green ambient lighting. Photograph from the side or slightly above to capture dorsal abdominal patterns.
Identified: 2026-07-31T02:21:31.633544