Canopy Jumping (Phidippus otiosus)

Physical description and identification

The canopy jumping spider is one of the larger and most thickset jumping spiders of the American Southeast, and almost everything about it is built for life on bark. The body is broad and low, the legs are stout, and mottled grey, white and tawny scales break its outline against lichen-covered oak. Most people notice it only when it turns to face them, because a Phidippus that has spotted movement pivots its whole body and watches.

Adults

• Size: females are large for a salticid, roughly 10–16 mm (0.4–0.6 in) in body length; males are slimmer and shorter at about 7–12 mm. The single figure of 16 mm quoted in popular accounts is the upper limit for a heavy female, not a typical adult.
• Color: grey-brown to tawny, dusted with white and pale scales that give a lichen-like mottling. The abdomen carries a pale central band or paired light spots, and the carapace usually has a cream border of scales around the eye region. Freshly moulted spiders look almost orange-brown; worn ones look dull grey.
• Eyes: eight eyes in four pairs on a squared, box-like carapace. Two enormous forward-facing anterior median eyes dominate the face, flanked by smaller lateral eyes, with two further pairs set back along the head. This is the quickest way to separate any jumping spider from the wolf spiders or crab spiders it is confused with; see our guide to spider eyes.
• Distinctive features: the chelicerae are metallic and iridescent, flashing green, violet or bronze with the angle of light — a hallmark of Phidippus. Dark tufts of stiff setae sit above the front eyes. Males are darker, with longer front legs and swollen pedipalps they wave in courtship.

Eggs and egg sac

The female builds a thick, opaque silk retreat under a flap of loose bark and lays her eggs inside it, sealing herself in with them and eating little while she guards them. Timing follows the mild southern climate rather than a fixed calendar: egg-laying is recorded from January through June in Florida and as early as December in South Carolina, so in the far South this is one of the few large spiders found with eggs in midwinter.

Spiderlings

Hatchlings stay inside the maternal retreat through their first moult, living on yolk reserves, then disperse across the trunk and canopy. They spend the summer as juveniles, growing through a series of moults — see how spiders moult — and most mature by autumn. Juveniles look like small, paler females; the sexes diverge only at the final moult.

Hunting and the use of silk

The canopy jumping spider builds no capture web. That is not a gap in its biology but the defining feature of the family: Salticidae traded snare-building for sight-hunting. The spider walks the bark by day, freezes when its wide-field side eyes register movement, swivels to bring the high-resolution front eyes onto the target, stalks to within a few centimetres and jumps. Silk remains essential — before every leap it tacks a dragline to the bark as a safety rope and an in-flight tether, and it spins the tent-like retreat used for moulting, mating and egg-laying. For the contrast with a true snare, compare the engineering of a spider web built by an orb weaver.

Where the canopy jumping spider lives

Phidippus otiosus is a spider of the warm, humid Southeast. It is common throughout Florida and the Gulf and Atlantic coastal plain, with records running north through Georgia, South Carolina, North Carolina and Virginia, and inland into Alabama, Mississippi, Tennessee and Kentucky. Scattered northern records reach New Jersey, although populations thin out sharply away from the coastal plain.

Its habitat is the standing tree itself. Live oak, laurel oak, slash pine and longleaf pine are the classic substrates, and the spider works the trunk, the larger limbs and the undersides of branches rather than foliage or the ground. Loose bark plates, resin scars and old woodpecker damage supply the crevices it uses for retreats. Because it tolerates disturbed woodland, it turns up readily on shade trees in yards, on fence posts, on wooden decking and on the outside walls of houses next to woodland, which is where most people meet it. It does not colonise buildings and is not a house spider; individuals found indoors have wandered in and can simply be carried back out.

Are canopy jumping spiders venomous?

Yes, in the same sense that nearly every spider is venomous: Phidippus otiosus uses venom to immobilise the insects it catches. It is not dangerous to people. Jumping spider venom is tuned to small arthropod prey and contains none of the necrotic enzymes of the recluse spiders or the vertebrate-active neurotoxins of the widow spiders. No death, systemic illness or lasting injury has been attributed to any member of the family Salticidae, which includes more than 6,000 described species worldwide. The one caveat is individual allergy: as with a bee sting, a few people react more strongly to arthropod proteins, which is a property of the person rather than of the venom.

Can a canopy jumping spider bite?

It can. This is a large jumping spider with robust chelicerae and, unlike most tiny salticids, it is physically capable of piercing skin. In practice bites are rare and always defensive — a spider squeezed inside clothing or pressed while being picked up. Its first reaction to a hand is to run around the far side of the branch or drop on its dragline.

A bite feels like a pinprick. Expect a small red mark and brief soreness that fades within hours. Wash the area with soap and water, apply a cold pack and leave it alone. Seek medical advice only for spreading redness, unusual swelling or signs of an allergic reaction such as hives or breathing difficulty, which indicate sensitivity rather than a toxic effect.

Ecological importance and behavior of the canopy jumping spider

The canopy jumping spider is a visual, day-active predator of tree bark, filling a niche snare-builders cannot reach. Flies, small moths, leafhoppers, plant bugs, beetles, ants, caterpillars and other spiders are all taken, and large females will tackle prey close to their own size. Hunting on the trunk surface removes insects that would never blunder into an aerial web, so the species is a real contributor to pest control on shade and orchard trees.

How the jump works: spiders have no extensor muscles in the leg joints that matter for leaping. Instead the spider raises its internal blood pressure and forces the third and fourth legs straight, turning hydraulic pressure into a rapid extension that covers many times its body length. The dragline laid before take-off works as both brake and tether.

Natural predators: anoles and other lizards, insectivorous birds, mud-dauber and spider wasps that stock their nests with paralysed spiders, larger spiders, and parasitoid wasps that attack egg sacs.

Seasonal behavior: adults persist through the mild southern winter, sheltering in bark retreats on cold days and emerging whenever sun warms the trunk. Courtship is visual and ritualised: the male signals from a distance with raised, waving front legs, because approaching a female without identifying himself is dangerous.

Relationship with humans: entirely benign, and a favourite of photographers for its size, colour and apparent curiosity. No control measures are warranted.

Similar spiders and how to tell them apart

Quick facts

Did you know?

• The species name otiosus is Latin for “idle” or “at leisure”, a nod to the spider's habit of sitting motionless on bark. Popular accounts that break the name into a Greek root meaning “black tufts of hair” are mistaken; the Greek element oto- refers to the ear.
• The green and violet flash of the chelicerae is structural colour, produced by layered surfaces that interfere with light rather than by pigment — the same physics that colours a hummingbird's throat.
• Jumping spiders move their retinas, not their eyes. Muscles inside the head swing the tube-shaped retina of each large front eye from side to side, so the spider can inspect an object while sitting perfectly still.
• Salticidae is the largest spider family on Earth, with well over 6,000 described species — see the zebra jumper and the magnolia green jumper on our jumping spiders page.

In summary, the canopy jumping spider is a big, sharp-eyed, completely harmless bark hunter of southeastern woodland — no snare, just eyesight and a hydraulic leap.