Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Family Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical wheel-shaped webs, excellent vision for movement detection, and robust bodies.
Physical Description
The spider has a robust, rounded abdomen and a distinctively narrower cephalothorax. Females are significantly larger and bulkier than males. The body is covered in fine, short setae, giving it a slightly textured appearance.
Size Estimate
Body length typically ranges from 9 to 19 mm for adult females, with males being smaller at around 8 to 12 mm. Leg span can reach up to 40 mm.
Coloration & Markings
Base coloration ranges from yellowish-brown to reddish-brown or grey. The abdomen often features a distinctive cross-like pattern or a series of spots and chevron markings, though lighting in the image causes high contrast.
Web Type
Builds a large, vertical orb web, characteristic of the Araneidae family. The web consists of sticky spiral lines supported by non-sticky radial threads and is typically constructed in the evening.
Eye Arrangement
Eight eyes arranged in two rows of four (anterior and posterior rows), typical of orb-weavers, with lateral eyes often grouped in pairs.
Leg Characteristics
Legs are moderately long, stout, and prominently banded with dark rings. They feature distinct spines and are usually held outstretched when resting in the center or edge of the web.
Venom & Safety Information
Venom Information
Venom is specialized for subduing invertebrate prey. It is low in potency relative to humans and is not medically significant.
Medical Significance
Harmless to humans. Bites are extremely rare, usually occurring only if the spider is directly pressed against the skin. Symptoms are minor and localized, similar to a mosquito bite.
Safety Recommendations
No special safety measures required. If found indoors, gently guide the spider into a container using a piece of paper and release it outdoors.
Habitat & Behavior
Habitat & Range
Found widely across North America. Prefers habitats around human structures, barns, porches, gardens, and wooded edges where artificial lights attract flying insect prey.
Behavior & Temperament
Nocturnal web-weaver that often retreats to a nearby hiding spot or sits in the center of the web during the night. Highly docile and non-aggressive toward humans.
Diet & Prey
Feeds primarily on flying insects such as moths, beetles, mosquitoes, and flies caught in its orb web.
Seasonal Activity
Most active and commonly noticed during late summer and autumn when adults reach maximum size and females prepare egg sacs.
Description
The Barn Spider is a common and fascinating nocturnal orb-weaver often spotted building large, geometric webs near porch lights. With its robust abdomen and banded legs, it serves as a master architect of the night, silently controlling insect populations around homes and gardens.
Key Features
Robust, bulbous abdomen, distinctive cross or chevron dorsal markings, vertically oriented orb web, and a nocturnal habit of resting head-down in the web center.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a more distinct white cross on the abdomen, and Neoscona domiciliorum (Red House Spider), distinguished by brighter reddish coloration.
Life Cycle
Females construct silken egg sacs in protected crevices during autumn containing hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning before maturing by late summer.
Ecological Importance
Acts as an effective natural pest controller by intercepting large quantities of flying agricultural and household insect pests.
Conservation Status
Not evaluated by the IUCN, but populations are abundant, stable, and widespread throughout their range.
Interesting Facts
Barn spiders frequently consume and rebuild their entire orb webs every single night to maintain the stickiness of the silk capture threads.
Photography Tips
Use a macro lens with a flash or external light source to illuminate details against the dark background, capturing the spider from the side or slightly above while it rests in its web.
Identified: 2026-09-23T09:56:17.123513