Missing Sector Orb-Weaver
Zygiella x-notata
Araneidae (Orb-Weavers), Order Araneae. Characterized by building vertical orb webs and having eight similar-sized eyes.
Physical Description
The spider features a robust, pear-shaped abdomen and a distinct cephalothorax. The body is relatively compact with typical orb-weaver proportions, sporting a slightly hairy or bristled texture with prominent markings across the dorsal surface.
Size Estimate
Body length typically ranges from 7 to 11 millimeters for females and 5 to 7 millimeters for males, with a leg span proportional to a medium-sized orb-weaver.
Coloration & Markings
Features a pale greyish or yellowish-white background with a characteristic dark, jagged, leaf-like or cross-shaped marking (folium) on the abdomen, accompanied by distinct pale and dark banding on the legs.
Web Type
A classic vertical orb web featuring a signature missing sector at the top, from which a specialized signal thread leads to a small retreat where the spider waits.
Eye Arrangement
Eight eyes arranged in two rows of four, typical of the orb-weaver family Araneidae, with lateral eyes often grouped in pairs.
Leg Characteristics
Long, moderately thick legs with clear alternating dark and light banding and fine hairs/spines, typically held flat against the surface or angled when resting.
Venom & Safety Information
Venom Information
Neurotoxic venom optimized for paralyzing small invertebrate prey, with minimal potency against humans.
Medical Significance
Harmless to humans. Bites are extremely rare, occur only if pressed directly against the skin, and typically result in mild, localized irritation comparable to a mosquito bite.
Safety Recommendations
No special safety precautions are necessary. If one builds its web in an inconvenient spot near a doorway, it can be gently relocated using a cup and piece of paper.
Habitat & Behavior
Habitat & Range
Widely distributed across Europe and introduced to parts of North America. Commonly found around human habitation, window frames, walls, fences, and outbuildings.
Behavior & Temperament
Docile and non-aggressive. Spends daylight hours hiding in a silk-lined retreat connected to the web by a signal thread, actively monitoring the web for vibrations at night.
Diet & Prey
Feeds primarily on small flying insects such as flies, midges, and mosquitoes caught in its vertical orb web.
Seasonal Activity
Most active and commonly noticed during late summer and autumn when adults reach full size and construct prominent webs near human structures.
Description
The Missing Sector Orb-Weaver is a fascinating architectural master of the spider world, easily recognized by the distinctive gap left in the top of its web. Preferring the company of humans around buildings and window frames, this discreet nocturnal hunter spends its days hidden away in a silken retreat, emerging at nightfall to tend its web and catch flying pests.
Key Features
The distinctive missing sector in the upper portion of the orb web combined with the pale-and-dark folium pattern on the abdomen.
Similar Species
Zygiella atrica, which shares the missing sector web design but typically inhabits outdoor foliage rather than human structures and features subtle differences in genital morphology.
Life Cycle
Females lay silk-wrapped egg sacs in autumn near their retreat. Spiderlings hatch in spring, undergo multiple molts, and reach maturity by late summer or autumn.
Ecological Importance
Acts as an effective natural pest controller around homes and gardens by intercepting large quantities of flying nuisance insects like mosquitoes and gnats.
Conservation Status
Not evaluated by the IUCN, but highly abundant, widespread, and thriving in human-modified environments.
Interesting Facts
The unique missing sector web design allows the spider to run a single signal thread directly from the hub to its daytime retreat, enabling it to feel the vibrations of trapped prey without sitting exposed in the center of the web.
Photography Tips
Best photographed at night when the spider is active at the center of its web or waiting in the retreat. Use a macro lens with a flash to highlight the web structure and abdominal patterns.
Identified: 2026-09-23T14:36:23.651142