04/27/2026
✨Platycryptus undatus (Tan Jumping Spider) ✨
The Platycryptus undatus is a common and harmless spider known for its flattened body, mottled tan/gray coloration, and bushy front appendages, which help it camouflage on tree trunks and walls. It's a visual hunter with excellent eyesight, using its powerful back legs to pounce on prey like flies and aphids, and it's not aggressive towards humans, though it can bite defensively if threatened or cornered as will any animal.
Identification🔎
Appearance:
Mottled tan, gray, and brown with a distinctive chevron or wavy pattern on its abdomen.
Size:
Females up to 5/8 inch, males smaller (up to 3/8 inch).
Key Feature:
Bushy, white-haired front appendages (pedipalps) that look like a mustache.
Eyes:
Eight eyes, with the two large front ones providing excellent vision.
Habitat and Behavior
Habitat:
Prefers vertical surfaces like tree trunks (especially hickory), fence posts, and building walls, often hiding under bark.
Hunting:
A visual predator that stalks and pounces on prey, using its strong back legs to jump.
Camouflage:
Its flattened body and markings help it blend in with bark and other surfaces.
Temperament:
Not aggressive; bites are rare and usually defensive, causing only mild reactions in most people.
✨Fun Facts✨
Name:
Its scientific name, Platycryptus undatus, means "wavy-edged, flat, hiding".
Jumping:
Can jump significant distances, sometimes up to 50 times its body length.
Courtship:
Males perform elaborate dances, waving their front legs to attract females.
