Nursery Web Spider
Pisaura mirabilis
Pisauridae (Nursery Web Spiders), Order Araneae. Key family characteristics include anterior lateral eyes smaller, similar to wolf spiders but distinguished by their ability to carry egg sacs in their chelicerae rather than attached to spinnerets.
Physical Description
Elongated body shape with a long abdomen and distinct cephalothorax, typical of nursery web spiders. The texture is finely haired, giving a velvety appearance.
Size Estimate
Body length typically around 10 to 15 mm for females, with a substantial leg span of up to 50 mm.
Coloration & Markings
Variable shades of brown, grey, and tan, often featuring a lighter central stripe running down the carapace and abdomen bordered by darker patches.
Web Type
Does not build a traditional web to catch prey. Instead, females construct a nursery web of silk spun over vegetation just before their eggs hatch.
Eye Arrangement
Eight eyes arranged in two curved rows, similar to wolf spiders (Lycosidae), but with slightly different proportions where the anterior eyes are smaller.
Leg Characteristics
Long, slender legs with distinct spination and subtle banding. Often held close together when resting, especially the front pairs.
Venom & Safety Information
Venom Information
Contains mild venom used to subdue insect prey. It is not potent enough to pose any threat to humans.
Medical Significance
Harmless to humans. Bites are extremely rare and typically only occur if the spider is squeezed or directly threatened, resulting in mild, localized irritation similar to a mosquito bite.
Safety Recommendations
No special precautions needed. If found indoors, it can be gently guided into a container and released outdoors in a garden or grassy area.
Habitat & Behavior
Habitat & Range
Widely distributed across Europe and parts of Asia. Prefers tall grass, meadows, woodland edges, and gardens.
Behavior & Temperament
Active diurnal hunters that roam through low vegetation. Known for their elaborate courtship ritual involving silk-wrapped nuptial gifts.
Diet & Prey
Generalist predators feeding on various insects, including flies, beetles, grasshoppers, and occasionally smaller spiders.
Seasonal Activity
Most active during the spring and summer months, with courtship peaking in late spring and nursery webs appearing in mid-summer.
Description
The nursery web spider is a fascinating roaming hunter known for its remarkable maternal care and unique courtship rituals. Sporting mottled brown camouflage, it expertly navigates tall grasses and shrubs in search of insect prey without relying on a trap web.
Key Features
Elongated body, characteristic light central stripe, the habit of carrying the egg sac in the jaws, and the distinctive way it holds its front legs together.
Similar Species
Wolf spiders (Lycosidae), which can be distinguished because wolf spiders carry their egg sacs attached to their spinnerets instead of in their mouthparts.
Life Cycle
Females carry their egg sac in their jaws until near hatching, then build a tent-like nursery web where spiderlings stay through their early molts.
Ecological Importance
Acts as an effective natural controller of insect populations in meadows and gardens, serving as an important link in the terrestrial food web.
Conservation Status
Common and widespread throughout its natural range, with stable populations and no special conservation concerns.
Interesting Facts
Males offer females wrapped insect prey as a nuptial gift to avoid being eaten during mating, sometimes even playing dead if the female shows aggression.
Photography Tips
Use a macro lens in natural daylight. Approach slowly to avoid startling the spider, and capture side or top angles to clearly show the cephalothorax markings.
Identified: 2026-09-08T20:06:06.783771