Tiger Wolf Spider, Woodland Wolf Spider, Forest Wolf Spider
Tigrosa aspersa
Lycosidae (Wolf Spiders), Order Araneae. Characterized by large, forward-facing eyes and excellent ground-hunting mobility.
Physical Description
Robust, hairy body with an oval cephalothorax and a slightly smaller, bulbous abdomen. The surface is covered in short, dense setae which give it a matte, textured appearance. Powerful chelicerae are visible at the front.
Size Estimate
Body length typically 15-25mm for females, with a leg span reaching up to 50-75mm (2-3 inches). These appear to be mature or near-mature adults.
Coloration & Markings
Dull brown to grayish-tan base. The cephalothorax features a thin, distinct yellow or pale median line. The abdomen often has a dark cardiac mark and chevrons. Legs may show faint dark banding or mottling.
Web Type
Non-web-building hunters. They do not spin webs to catch prey but may use silk to line a retreat or burrow in leaf litter or soil.
Eye Arrangement
Three rows of eyes: a bottom row of four small eyes, two very large posterior median eyes above them, and two medium posterior lateral eyes further back on the head.
Leg Characteristics
Thick, powerful legs designed for running. They are covered in sensory hairs and prominent black spines (macrosetae). Leg IV (back legs) are typically the longest for propulsion.
Venom & Safety Information
Venom Information
Complex venom containing proteins and peptides designed to paralyze insects. It is not considered neurotoxic or necrotic to humans; the potency is very low for mammals.
Medical Significance
Low danger level. Bites are rare and usually comparable to a bee sting, causing localized pain, swelling, and redness. No specific medical treatment is usually required unless an allergic reaction occurs.
Safety Recommendations
If found indoors, relocate using the 'cup and paper' method. Wear gloves if handling woodpiles or leaf litter where they hide. Bites are best treated with a cold compress and basic antiseptic.
Habitat & Behavior
Habitat & Range
Found throughout Eastern and Central North America. Preferred habitats include deciduous forests, woodlands, gardens, and occasionally basements or garages.
Behavior & Temperament
Active nocturnal hunters that use excellent eyesight and vibration sensing. Generally non-aggressive and shy toward humans, preferring to flee rather than bite unless cornered or handled.
Diet & Prey
Generalist predators feeding on crickets, beetles, roaches, and other spiders. They use an ambush or 'run-down' technique, pinning prey with their legs and delivering a quick bite.
Seasonal Activity
Most active from late spring through autumn. Mature males are often seen wandering in late summer and fall while searching for mates.
Description
The Tiger Wolf Spider is a formidable floor-dwelling predator of the forest floor. With its camouflaged, hairy body and keen night vision, it acts as a primary controller of ground-dwelling insect populations.
Key Features
Distinct thin yellow centerline on the carapace, large size, hairy texture, and the unique Lycosid eye arrangement with two dominant forward-facing eyes.
Similar Species
Hogna carolinensis (larger, lacks the thin yellow line), Rabidosa rabida (distinct dark stripes on carapace), and Tigrosa helluo (similar, but usually smaller with different underside markings).
Life Cycle
Females carry their large, spherical egg sacs attached to their spinnerets. Upon hatching, the spiderlings climb onto the mother's back and remain there for protection for several days before dispersing.
Ecological Importance
Crucial pest controllers in both wild and domestic environments. They help manage populations of agricultural pests and common household nuisances like crickets and cockroaches.
Conservation Status
Not evaluated by the IUCN, but generally considered common and stable throughout its range. Vulnerable to heavy pesticide use in residential areas.
Interesting Facts
Wolf spiders are unique among spiders for their extensive maternal care, carrying both their eggs and their hatched young. They can also detect the ultrasonic sounds of certain insect prey.
Photography Tips
Get a low-angle shot to capture the eye arrangement and 'face.' Use a ring light or flash to highlight the hair texture and the diagnostic yellow line on the cephalothorax.
Identified: 2026-05-08T15:22:59.860003