Common Nursery Web Spider
Pisaurina mira
Pisauridae (Nursery Web Spiders), Order Araneae
Physical Description
Elongated body shape featuring a tapered, cigar-shaped abdomen and a distinct cephalothorax marked by longitudinal stripes. The spider appears slightly velvety or finely hairy with long, slender legs held in a characteristic spread-eagled posture.
Size Estimate
Body length typically ranges from 13 to 20 mm for females and slightly smaller for males, with a total leg span reaching up to 50 to 75 mm.
Coloration & Markings
Predominantly light brown to tan with prominent dark brown or yellowish longitudinal stripes running along the length of both the cephalothorax and abdomen. Coloration varies from pale gray-brown to reddish-brown.
Web Type
Does not build a traditional web to catch prey. Instead, females construct a silken nursery tent in tall grass or leaves just before the spiderlings emerge.
Eye Arrangement
Eight eyes arranged in two distinct, slightly curved rows of four, all of roughly similar size, which is typical for the Pisauridae family.
Leg Characteristics
Long, thin, powerful legs equipped with numerous spines and hairs. The legs are typically held grouped in pairs (two forward, two backward) while resting or waiting for prey.
Venom & Safety Information
Venom Information
Contains mild neurotoxic venom used primarily to subdue small insect prey. Not potent or harmful to humans.
Medical Significance
Harmless to humans. Bites are extremely rare, usually occurring only if the spider is trapped directly against the skin. Symptoms are mild and generally limited to minor localized redness or swelling.
Safety Recommendations
No special precautions needed beyond standard caution when gardening. If found indoors, easily relocated outside using a cup and a piece of paper.
Habitat & Behavior
Habitat & Range
Found throughout eastern and central North America. Prefers tall grasses, shrubby fields, woodland edges, and gardens near water sources.
Behavior & Temperament
An active nocturnal hunter that ambushes prey rather than using a web. Generally docile and non-aggressive towards humans, fleeing or dropping to the ground when disturbed.
Diet & Prey
Feeds primarily on various insects, including grasshoppers, beetles, flies, and occasionally other small spiders, captured through active stalking and grabbing.
Seasonal Activity
Most active during the warm spring and summer months, with mating occurring in early summer and nursery webs appearing by mid-to-late summer.
Description
The Common Nursery Web Spider is a striking, long-legged hunter frequently encountered in gardens and grassy fields across North America. Known for their distinct longitudinal stripes and unique maternal care where females carry egg sacs in their jaws before spinning a nursery tent, these spiders are beneficial and fascinating inhabitants of outdoor ecosystems.
Key Features
Distinctive longitudinal stripes running down the cephalothorax and abdomen, long spiny legs held in a characteristic lateral spread, and the habit of carrying large egg sacs in their mouthparts.
Similar Species
Often confused with Wolf Spiders (Lycosidae) or Grass Agelenopsis species. Unlike wolf spiders, nursery web spiders carry egg sacs in their jaws rather than attached to spinnerets, and they can climb smooth vertical surfaces more easily.
Life Cycle
Females carry their egg sacs in their chelicerae until just before hatching, then construct a silken nursery web in foliage. The female guards the web until the spiderlings disperse. They undergo multiple molts and typically live for one year.
Ecological Importance
Acts as an effective natural predator that helps control insect populations in gardens, agricultural fields, and natural ecosystems.
Conservation Status
Secure and widespread throughout its native geographic range with stable population trends.
Interesting Facts
Male nursery web spiders often offer a silk-wrapped nuptial gift (such as a dead insect) to females during courtship to reduce the risk of being cannibalized.
Photography Tips
Photograph from a slightly elevated angle to clearly capture the longitudinal stripe patterns on the back. Use natural indirect light and a macro lens to show leg spining and eye arrangement.
Identified: 2026-10-25T17:47:26.292489