Giant Crab Spider, Golden Huntsman Spider
Olios giganteus
Sparassidae (Huntsman Spiders), Order Araneae
Physical Description
A large, robust spider with a flattened body shape (laterigrade) adapted for squeezing into tight crevices. The cephalothorax is broad and slightly heart-shaped, while the abdomen is more oval. The body is covered in fine, dense hairs, giving it a velvety texture.
Size Estimate
Body length typically 0.75-1 inch (2-2.5 cm); leg span can reach 2-3 inches (5-7.5 cm). This specimen appears to be an adult female based on the broad, heavy abdomen.
Coloration & Markings
Variable tan to grayish-brown base color. The abdomen features a central dark longitudinal stripe (cardiac mark) flanked by a series of darker, chevron-like patterns or mottling. The cephalothorax often has a darker V-shaped mark leading toward the eyes.
Web Type
None. This is a hunting spider that does not build webs for prey capture. It creates silken retreats or 'sleep-sacks' in crevices or under bark to hide during the day.
Eye Arrangement
Eight eyes in two horizontal rows of four. The eyes are relatively similar in size, providing excellent vision for nocturnal hunting.
Leg Characteristics
Long, thick, and powerful legs that are oriented to the sides (crab-like). The legs show faint banding and are covered in sensory hairs. The tips of the legs have specialized pads (scopulae) allowing them to climb smooth vertical surfaces, including glass.
Venom & Safety Information
Venom Information
Possesses venom used to subdue insect prey. The venom is not considered medically significant to healthy humans and is not necrotic or neurotoxic in a way that causes systemic illness.
Medical Significance
Low medical significance. A bite is comparable to a bee sting, causing localized pain, swelling, and redness. Symptoms usually subside within 24 hours. Medical attention is only necessary in case of an allergic reaction.
Safety Recommendations
If found indoors, they can be safely relocated using the 'cup and paper' method. Wear gloves if handling woodpiles or rocks. Do not attempt to crush them with bare hands as they can bite in defense.
Habitat & Behavior
Habitat & Range
Found throughout the Southwestern United States (Arizona, California, Nevada, New Mexico) and Northern Mexico. Common in arid desert environments, often found on saguaro cacti, under bark, or inside human structures (garages and stucco walls).
Behavior & Temperament
A nocturnal, active hunter that relies on speed and agility. They are generally shy and will flee rapidly when disturbed. They are not aggressive toward humans but may bite if pinned or handled roughly.
Diet & Prey
Generalist carnivore feeding on a wide variety of insects including crickets, cockroaches, and moths. They use their speed to dash out and ambush prey, rather than relying on traps.
Seasonal Activity
Most active during the warmer months (late spring through autumn). Frequently seen on the exterior of homes during summer monsoon season in Arizona.
Description
The Giant Crab Spider is one of the most imposing yet beneficial spiders of the American Southwest. Its large size and crab-like stance often cause alarm, but it serves as an excellent natural pest controller. It is a master of camouflage, blending perfectly with the desert soils and stucco walls common in places like Scottsdale.
Key Features
Laterigrade leg orientation (crab-like), distinctive dark cardiac stripe on the abdomen, large size, and absence of a web.
Similar Species
Often confused with Wolf Spiders (Lycosidae), but distinguished by the sideways leg orientation and eye pattern. Also confused with the Brown Recluse, but is significantly larger and lacks the specific violin-shaped marking.
Life Cycle
Females produce a silken egg sac which they often guard within a retreat. Spiderlings emerge and may stay near the mother briefly before dispersing. They can live up to 2 years in the wild.
Ecological Importance
Crucial for controlling populations of nocturnal insects, including those considered household pests like cockroaches and crickets.
Conservation Status
Not evaluated by the IUCN, but populations appear stable throughout their range in the Sonoran Desert.
Interesting Facts
Despite their size, they are incredibly agile and can run vertically up walls or across ceilings with ease. They are one of the few large spiders that frequently enter homes in Arizona during the summer months to escape the heat.
Photography Tips
Focus on the eye arrangement and the dorsal pattern on the abdomen for identification. Use a flash or side-lighting to highlight the hair texture and leg spines.
User Notes
Scottsdale Arizona
Identified: 2026-07-14T18:20:31.586427