Bridge Spider, Gray Cross Spider
Larinioides sclopetarius
Araneidae (Orb-Weavers), Order Araneae
Physical Description
A robust orb-weaver with a large, oval-to-round abdomen that is somewhat flattened dorsally. The cephalothorax is broad and covered in fine gray and white hairs. The abdomen features a distinct undulating folium pattern bordered by white.
Size Estimate
Female body length 10-14mm, male 6-8mm; leg span approximately 25-35mm. This specimen appears to be an adult female.
Coloration & Markings
Predominantly gray, brown, and white. The abdomen has a high-contrast dark folium (leaf-like pattern) with a pale border. The legs are heavily banded with dark brown and light gray.
Web Type
Large, classic circular orb web. Often built on man-made structures near water, such as bridges, railings, and window frames.
Eye Arrangement
Eight eyes arranged in two rows; the four median eyes form a central trapezoid, typical of the Araneidae family for detection of prey vibrations and light.
Leg Characteristics
Strong, moderately long legs equipped with numerous macrosetae (spines). Notable for striking dark and light banding patterns and strong claws for gripping silk.
Venom & Safety Information
Venom Information
Possesses a mild protein-based venom used to quickly immobilize small insect prey. Not hazardous to humans.
Medical Significance
Low medical significance. Bites are rare and typically result in no more than mild localized redness or swelling, similar to a bee sting.
Safety Recommendations
Harmless to residents. If relocation is desired, use a cup and paper to move the spider to a nearby railing or exterior wall away from doorways.
Habitat & Behavior
Habitat & Range
Commonly found in Europe and North America, specifically near large bodies of water. Highly attracted to artificial light on buildings, docks, and bridges.
Behavior & Temperament
Nocturnal hunter that hides in crevices during the day. Generally docile and non-aggressive towards humans, opting to retreat or drop from the web if disturbed.
Diet & Prey
Primarily flying insects such as midges, mosquitoes, and moths that are attracted to bridge and building lights near water.
Seasonal Activity
Most active from late spring through late autumn. Often seen in high densities on bridges during warm summer nights.
Description
The Bridge Spider is a master architect of the urban waterfront. Recognizable by its high-contrast gray folium and its preference for metal and stone structures, it is a frequent companion to city dwellers living near rivers or lakes.
Key Features
High-contrast scalloped folium on the abdomen, gray-scale coloration, and a habitat preference for human structures near water.
Similar Species
Larinioides cornutus (Furrow Spider) which is usually more brown/red and found in vegetation, and Araneus diadematus which has a distinct white cross.
Life Cycle
Females lay silken egg sacs in late summer or autumn in protected crevices. Spiderlings emerge in spring. Lifespan is typically one to two years.
Ecological Importance
Provides significant natural pest control in urban and riparian corridors by consuming vast quantities of aquatic midges and mosquitoes.
Conservation Status
Not evaluated by IUCN, but widespread and common with stable populations throughout its range.
Interesting Facts
This species is famous for its 'anthrophile' nature, meaning it thrives in human-made environments, particularly using bridge lights as lure-traps for insects.
Photography Tips
Focus on the dorsal abdomen pattern for ID. Macro shots of the cephalothorax help distinguish it from the Furrow Spider. Best photographed at night with a flash.
Identified: 2026-05-02T16:21:12.967009