Tan Jumping Spider, Familiar Jumping Spider
Platycryptus undatus
Salticidae (Jumping Spiders), Order Araneae
Physical Description
A compact, somewhat flattened spider with a distinct 'fuzzy' appearance. It features a wide cephalothorax and an elongated oval abdomen. Like most jumping spiders, they are characterized by their large, forward-facing eyes and powerful, thick legs.
Size Estimate
Body length is typically 8-13mm (0.3-0.5 inches) for females; males are slightly smaller. This appears to be an adult specimen based on the distinct patterning.
Coloration & Markings
A complex mottling of grey, brown, tan, and black. The abdomen features a prominent, dark undulating or 'V-shaped' chevron pattern down the center, flanked by lighter grey/tan patches which provide excellent camouflage against bark and concrete.
Web Type
They do not build hunting webs. Instead, they construct small, thick silk 'retreats' or sacs for molting, laying eggs, or sleeping at night.
Eye Arrangement
Four pairs of eyes with two exceptionally large Anterior Median Eyes (AME) that provide high-resolution binocular vision. The remaining eyes are smaller and wrap around the side of the head for a near 360-degree field of view.
Leg Characteristics
Relatively short, stout, and hairy; designed for powerful jumping rather than sustained running. They are often held tucked close to the body when at rest.
Venom & Safety Information
Venom Information
Contains complex proteins meant to immobilize insects. The venom is not considered toxic to humans and is much weaker than that of a bee sting.
Medical Significance
Harmless to humans. Bites are extremely rare and usually only occur if the spider is pinched against skin. Symptoms are typically limited to mild, localized redness or itching.
Safety Recommendations
No special safety measures are required as they are non-venomous to humans. If found indoors, they can be easily relocated using a cup and a piece of paper.
Habitat & Behavior
Habitat & Range
Common across North America, particularly in the Eastern United States and Southern Canada. They are very frequent 'synanthropes,' meaning they lived near humans on vertical surfaces like fences, walls, and siding.
Behavior & Temperament
Highly intelligent, visual hunters that stalk prey. They are curious and generally calm around humans, often 'watching' people with their large eyes. They are not aggressive and will usually jump away if threatened.
Diet & Prey
Generalist predators eating small insects including flies, gnats, and mosquitoes. They use their keen eyesight to stalk prey from a distance before pouncing with a silk tether for safety.
Seasonal Activity
Most active from late spring through autumn. They often seek shelter in crevices to overwinter during the cold months.
Description
The Tan Jumping Spider is one of the most charismatic spiders found in North American backyards. Unlike the skittish behavior of many other spiders, these hunters are visually oriented and seem to possess a level of curiosity, often tilting their heads to look at observers. Their cryptic coloration makes them masters of disguise on tree trunks and stone walls.
Key Features
Distinguishable by the undulating/wavy dark pattern on the abdomen, its flattened body shape, and the signature 'friendly' large front eyes of the Salticidae family.
Similar Species
Other members of the Platycryptus genus or larger jumping spiders like Phidippus audax (Bold Jumper), though P. audax is usually black with a distinct spot and not flattened.
Life Cycle
Females lay eggs in a silk retreat and often guard them until they hatch. Young spiderlings may 'balloon' on silk threads to find new territory. They typically live for one to two years.
Ecological Importance
Crucial for natural pest control around the home, as they active hunt and consume common indoor and garden pests like flies and moths.
Conservation Status
Common and widespread; not currently listed on IUCN red lists.
Interesting Facts
Jumping spiders have better vision than most other invertebrates and can see in color. They also use a silk 'safety line' whenever they jump, acting like a bungee cord if they miss their target.
Photography Tips
Get down to eye level to capture their large anterior median eyes. Use a macro lens if possible; they are very patient subjects if you move slowly and avoid casting a sudden shadow over them.
Identified: 2026-07-08T21:54:21.728357