Small Wolf Spider
Tigrosa annexa
Family Lycosidae (Wolf Spiders), Order Araneae
Physical Description
A robust, ground-dwelling spider with a cephalothorax that is slightly longer than it is wide. It features a moderately hairy texture with a characteristic 'teardrop' or pear-shaped body profile. The abdomen is egg-shaped and tapers slightly at the rear.
Size Estimate
Typical body length is 10-15 mm. The leg span generally ranges from 25 mm to 40 mm. This specimen appears to be an adult or sub-adult based on its camouflage and proportions.
Coloration & Markings
Primarily tan, brown, and gray. It has a distinctive light median stripe running down the center of the cephalothorax, flanked by darker bands. The abdomen often features a faint cardiac mark and subtle chevrons towards the posterior.
Web Type
None. This is a hunting spider that does not spin webs for prey capture. It may use silk to create a small retreat or to carry its egg sac.
Eye Arrangement
Three rows of eyes: a bottom row of four small eyes, two very large primary eyes in the middle row, and two medium-sized eyes on the top row, providing excellent vision for hunting.
Leg Characteristics
Long, thick legs designed for sprinting. They are covered in fine hairs and sensory spines (macrosetae). Usually tan or light brown with very faint, indistinct banding or no banding at all.
Venom & Safety Information
Venom Information
The venom is primarily composed of various proteins and peptides designed to paralyze insects. It is not considered dangerous to humans and lacks the necrotic or neurotoxic potency of medically significant spiders.
Medical Significance
Low significance. A bite may cause minor localized pain, swelling, or redness similar to a bee sting. No specific medical treatment is usually required unless an allergic reaction occurs.
Safety Recommendations
If found indoors, they can be easily relocated using the 'cup and paper' method. Wear gloves if gardening in areas with thick leaf litter to avoid accidental bites.
Habitat & Behavior
Habitat & Range
Common throughout the Eastern and Central United States. Preferred habitats include grassy lawns, meadows, forest edges, and residential gardens where they can easily hide in leaf litter or grass.
Behavior & Temperament
An active, diurnal and nocturnal cursorial hunter. They are generally skittish and will flee rapidly when disturbed. They are not aggressive towards humans and only bite if pinned or handled roughly.
Diet & Prey
Generalist predators feeding on a variety of ground-dwelling insects, including crickets, ants, and beetles. They use their speed and strong chelicerae to overpower prey without the aid of a web.
Seasonal Activity
Most active from late spring through autumn. Large numbers of adults are frequently seen in late summer during the mating season.
Description
The Small Wolf Spider is a master of camouflage, blending seamlessly into the sun-drenched grass and fallen needles of suburban lawns. Unlike the larger, more imposing wolf spiders, this species is sleek and quick, darting between blades of grass with incredible speed. It is a vital component of local ecosystems, acting as an organic form of pest control.
Key Features
Single pale median line on the carapace, large forward-facing eyes, and the absence of thick black banding on the legs.
Similar Species
Rabidosa rabida (Rabid Wolf Spider), which is much larger with more distinct stripes, and Tigrosa helluo, which is darker and prefers moister environments.
Life Cycle
Females carry their globular, often off-white or tan egg sacs attached to their spinnerets. After hatching, the spiderlings climb onto the mother's back and remain there for several days before dispersing via ballooning or crawling.
Ecological Importance
Significant apex predators within the micro-ecosystem of a lawn. They help control populations of agricultural and garden pests like grasshoppers and aphids.
Conservation Status
Not evaluated by the IUCN, but considered stable and common throughout its range with no major threats.
Interesting Facts
Wolf spiders are one of the few spider families that provide extensive maternal care by carrying their young on their backs. They see in the dark using a reflective layer behind their eyes called a tapetum lucidum, which makes their eyes 'glow' when caught in a flashlight beam.
Photography Tips
Focus specifically on the eye arrangement and the dorsal pattern on the carapace. Use a high shutter speed to capture them, as they are prone to sudden movements.
Identified: 2026-07-09T19:15:51.180843