Barn Spider, Spotted Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae
Physical Description
Robust, bulbous abdomen that is somewhat oval to triangular, joined to a smaller cephalothorax. Females are typically larger and rounder than males, with a slightly hairy texture and distinctive markings on the dorsal side of the abdomen.
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 an adult or sub-adult.
Coloration & Markings
Variable base coloration ranging from reddish-brown, orange-brown, to yellowish-tan. The abdomen typically features a central leaf-like pattern or a series of spots and a cross-like or angular marking, often flanked by lighter lines.
Web Type
Vertical orb web constructed in evening hours, typically featuring a sticky spiral and a non-sticky hub where the spider waits upside down.
Eye Arrangement
Eight eyes arranged in two rows of four, typical of orb-weavers, with the lateral eyes often paired on tubercles and median eyes situated on a raised central quadrangle.
Leg Characteristics
Moderately long, tapering legs featuring distinct dark and light banding patterns, equipped with spines and specialized claws used for manipulating silk and walking across the vertical web.
Venom & Safety Information
Venom Information
Neurotoxic/cytotoxic venom used strictly to immobilize insect prey. It is low in potency relative to humans and cannot cause systemic harm.
Medical Significance
Harmless to humans. A bite is rare and typically only occurs if the spider is directly squeezed or trapped against the skin, resulting in minor localized pain and redness akin to a mild bee sting.
Safety Recommendations
No special precautions needed beyond avoiding handling them bare-handed. If relocation is desired, gently guide the spider into a cup using a piece of cardstock.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly in eastern and central regions. Prefers wooded areas, gardens, and human-made structures such as barns, porches, and exterior walls where outdoor lighting attracts prey.
Behavior & Temperament
Nocturnal or crepuscular web-builder that often hides during the day in a nearby retreat made of rolled leaves or silk. Generally docile, non-aggressive, and shy, retreating or dropping from the web if disturbed.
Diet & Prey
Carnivorous, feeding primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and midges caught in its vertical orb web.
Seasonal Activity
Most active and prominent during late summer and autumn when individuals reach full adult size and construct webs near human dwellings.
Description
The Barn Spider (Neoscona crucifera) is a familiar and beneficial nocturnal neighbor frequently spotted hanging gracefully in large orb webs near porch lights or exterior walls. With its reddish-brown hues and bulbous, patterned abdomen, it serves as a master architect of the night, silently controlling flying insect populations around homes and gardens.
Key Features
Bulbous reddish-brown abdomen with faint cross or leaf markings, vertical orb web construction, nocturnal habits, and distinct leg banding.
Similar Species
Neoscona domiciliorum (Cave Orb-Weaver) and Araneus cavaticus (Barn Spider of literary fame), distinguished primarily by subtle variations in dorsal abdominal patterns and genital structures.
Life Cycle
Mating occurs in late summer and autumn, after which females produce papery silk egg sacs hidden in protected crevices. Spiderlings emerge in spring, dispersing via ballooning before maturing through multiple molts over a single season.
Ecological Importance
Acts as a natural pest control agent by significantly reducing populations of flying agricultural and household insect pests.
Conservation Status
Secure and widespread, with stable populations benefiting from human structures that provide artificial light sources attracting abundant prey.
Interesting Facts
Many orb-weavers consume and rebuild their entire web nearly every night to recycle proteins and maintain the sticky capture threads.
Photography Tips
Photograph at night using a macro lens and diffused flash to highlight the glossy texture and intricate dorsal patterns against the dark background.
Identified: 2026-09-12T22:39:11.173425