Nephila Clavipes
The golden silk orb weaver of the American tropics and the southeastern United States. A mature female hangs in a metre-wide sheet of yellow silk that glows in sunlight, while her mate, barely a fifth of her length, lives quietly on the same web without her taking much notice.
By Dr Richard J. Pearce (PhD)Published May 2, 2019Updated September 13, 2026✓ Reviewed by Dr. James Watuwa
In this guide
Physical description and identification
Nephila clavipes is the only large golden orb weaver native to the Americas, and once seen it is unmistakable: a long-bodied, brightly marked female at the hub of an enormous yellow web strung across a forest gap. It is widely called the banana spider, a name shared with unrelated and far more dangerous species, so the scientific name is worth keeping.
Adults
- Size: females have a body length of roughly 24–40 mm and a leg span that can reach 12 cm. Males measure about 6 mm — a fifth of the female's length and a tiny fraction of her mass. This is one of the most extreme cases of sexual size difference among spiders.
- Color: the female has a silvery-white carapace, a long cylindrical tan to olive abdomen dotted with pale yellow spots, and legs banded in orange-brown and dark brown. The underside is black with two conspicuous pale yellow marks. Males are plain dark reddish brown with slim legs and no banding.
- Eyes: eight eyes in two rows on a narrow head region. As in other orb weavers they do little more than detect light and movement; the spider works by vibration.
- Distinctive features: conspicuous brushes of dark hair on the first, second and fourth pairs of legs of the female. These tufts are the origin of the name clavipes, "club-footed", and no other American orb weaver has them.
Eggs and egg sac
The female builds her egg sacs away from the web, usually on a tree trunk or among leaves. Each sac is a loose, fluffy mass of yellow silk roughly 2.5–3 cm across and contains several hundred eggs, and a female may make two or three before she dies. The sac is not guarded for long. In Florida and the Gulf states the eggs overwinter; nearer the equator, breeding continues year round.
Spiderlings
Hatchlings are pale and unmarked and stay in a loose cluster for a short time before scattering, many of them by ballooning. Young spiders build small, complete orbs and look nothing like the adult — the silver carapace, the yellow spots and the leg tufts all develop through a series of molts as the spider grows.
The web
The web is the largest built by any spider in the region. A mature female's orb is commonly 60 cm to more than a metre across, and it is not quite symmetrical: the hub sits above centre, so the lower half is larger. Bridge and anchor lines two to three metres long carry it between trees, and loose tangles of barrier silk stand in front of and behind the orb, intercepting insects and giving some protection from birds.
Two things set it apart from a typical orb. The silk is genuinely yellow, coloured by pigments the spider produces, and it is exceptionally tough. And the web is semi-permanent: instead of being rebuilt whole each night, damaged sections are replaced piece by piece, so the same structure can stand for weeks. See our guide to spider webs for how that compares with other designs.
Where Nephila clavipes lives
The species ranges from the southeastern United States through Mexico, Central America and the Caribbean to South America as far south as northern Argentina. In the United States it is abundant in Florida and occurs along the Gulf and southern Atlantic coasts, reaching North Carolina and eastern Texas. Reports of populations in eastern Canada are mistaken: the species cannot survive freezing winters, and cold sets its northern limit.
Its habitat is warm, humid and sheltered: forest edges, trail corridors, clearings, mangrove and citrus groves, parkland and overgrown gardens. It needs wide gaps and still air, and colonies often form along a trail, with dozens of webs hanging in sequence. It is common throughout the forests of Brazil and Central America, and is one of the first large spiders most visitors to the American tropics notice.
Is Nephila clavipes venomous?
It is venomous in the ordinary sense — it uses venom to subdue the insects it catches — but the venom is not medically significant to humans or pets. Despite the spider's size and its abundance around homes in Florida and the tropics, no serious envenomation has been documented. It belongs to Araneidae, a family with no medically important members anywhere in the world.
One caution about the common name: "banana spider" is also used for the Brazilian wandering spiders (Phoneutria), which are genuinely dangerous. The two are not related and look nothing alike, but the shared name causes real confusion when someone finds a large spider in a shipment of fruit.
Can Nephila clavipes bite?
Yes, if a spider is handled roughly, pinned against skin or pulled out of its web. It is a reluctant biter: the normal reaction to disturbance is to shake the web violently, climb higher or drop on a dragline. When a bite does occur the effect is comparable to a bee sting — immediate sharp pain, a small red weal and sometimes brief local swelling that settles within a few hours to a day.
Wash the area, apply a cold pack, and take an ordinary painkiller if needed. Seek medical care only if the wound looks infected, or if you develop hives, swelling away from the bite, dizziness or breathing difficulty, which would point to an allergic reaction rather than to the venom.
Walking into the web: the far more common experience is walking face-first into one on a forest trail. The silk is strong enough to stop you, but the spider almost always retreats upward rather than onto you. Back out slowly and check your shoulders.
Ecological importance and behavior of Nephila clavipes
The golden orb weaver is a generalist predator on strong daytime fliers. Flies, bees, wasps, butterflies, moths, beetles and grasshoppers all end up in the web, and very large females occasionally catch small bats or hummingbirds. Prey is wrapped, bitten and often hung at the hub as a larder, which is why an established web has a line of silk-wrapped parcels beside the spider.
Natural predators: mud-dauber wasps hunt orb weavers and stock their nests with them, birds and lizards take adults from the edges of the web, and parasitoid wasps attack egg sacs. Webs are also invaded by tiny kleptoparasitic Argyrodes spiders — relatives of the cobweb spiders — which live in the barrier silk and steal wrapped prey.
Prey-predator dynamics: because the web is semi-permanent and huge, this species dominates the airspace of a forest gap in a way that nightly-rebuilding orb weavers cannot. Its Old World counterparts, such as the giant wood spider, occupy the same niche in Asia and Africa; in the same American forests the smaller silver garden spider works lower vegetation.
Seasonal behavior: in Florida the spiders mature in late summer and are most conspicuous from August to November. Males move onto a female's web while she is still immature and stay there, feeding on small prey and her leftovers; several may share one web. Mating is safest just after she molts or while she feeds.
Relationship with humans: harmless and useful. The species is a major consumer of biting flies and mosquitoes near houses in the tropics. Its silk has long attracted attention — it has been collected for experimental textiles and studied for surgical sutures and nerve-repair scaffolds because of its strength and biocompatibility.
Similar spiders and how to tell them apart
| Spider | How it differs from Nephila clavipes |
|---|---|
| Giant wood spider (Nephila pilipes) | The Asian equivalent, larger still, with bright yellow leg joints and a black and yellow abdomen. No overlap in range with the American species. |
| Joro spider (Trichonephila clavata) | A close relative from East Asia, now established in the southeastern USA. Smaller, with a blue-grey and yellow banded abdomen and a red mark underneath. |
| Golden silk orb weavers (other Nephila and Trichonephila) | The wider group shares the golden web and the huge female; ranges and abdominal patterns separate the species. Only clavipes is native to the Americas. |
| Silver garden spider (Argiope argentata) | Shares the tropical American range but has a short, notched, silvery abdomen, hangs head-down in an X posture, and builds a much smaller web with zigzag silk. |
| Long-jawed orb weavers (Tetragnathidae) | Also long-bodied but far smaller and slimmer, with enormous forward-projecting jaws. Their small horizontal orbs sit over water and the silk is not yellow. |
Quick facts
| Other names | Golden silk orb weaver, banana spider, golden silk spider, calico spider |
|---|---|
| Distribution | Southeastern USA, Mexico, Central America, the Caribbean and South America to northern Argentina. |
| Habitat | Warm, humid, sheltered sites — forest edges and clearings, trail corridors, mangroves, citrus groves, parks and gardens. |
| Diet | Flies, bees, wasps, butterflies, moths, beetles, dragonflies and grasshoppers; rarely very small vertebrates. |
| Lifespan | About one year; adults die after breeding and the northern populations do not survive frost. |
| Predators | Mud-dauber and parasitoid wasps, birds and lizards; Argyrodes spiders steal prey from the web. |
| IUCN status | Not evaluated. Common and widespread; it is not a threatened species. |
Did you know?
- The name means "club-footed": clava, a club, and pes, a foot, for the dark tufts of hair on the female's legs.
- A genomic study published in 2019 moved this spider and its closest relatives out of Nephila into the genus Trichonephila, so the current scientific name is Trichonephila clavipes. The older name remains in wide use.
- The yellow of the silk is not incidental. In bright sun the colour appears to attract bees and other insects, while in shade it blends with dappled light, so one pigment serves two purposes.
- Golden orb weaver silk has been woven into experimental textiles requiring the labour of millions of spiders, and its strength and tolerance in living tissue have made it a research subject for surgical sutures and nerve repair.
- Older sources list the species as threatened on the IUCN Red List. That is incorrect: it has never been assessed and is abundant.
In summary, Nephila clavipes is a large, spectacular and completely harmless spider whose golden web is one of the sights of the American tropics. The only real hazard it presents is the surprise of walking into one.
Frequently asked questions about the nephila clavipes
How do you identify a female Nephila clavipes?
Look for a very large orb weaver with a silvery-white carapace, a long cylindrical tan abdomen speckled with pale yellow spots, orange and brown banded legs, and dark brushes of hair on several leg joints. The body is 24–40 mm long and the web silk is visibly yellow.
How different in size are the male and female?
Dramatically. Females measure 24–40 mm in body length with a leg span up to 12 cm, while adult males are only about 6 mm and plain dark brown. The male is roughly a fifth of her length and a tiny fraction of her weight, one of the most extreme differences among spiders.
Why is the Nephila clavipes web golden?
The spider produces pigments that colour the silk itself, so the web is genuinely yellow rather than reflecting sunlight. Research suggests the colour attracts bees and other insects in bright light while blending into dappled shade, meaning a single pigment serves both as lure and camouflage.
How many eggs does a Nephila clavipes lay?
Each egg sac holds several hundred eggs, wrapped in a fluffy mass of yellow silk about 2.5–3 cm across. A female usually makes two or three sacs before she dies, attaching them to a tree trunk or among foliage rather than hanging them in the web itself.
Are Nephila clavipes spiders venomous to people?
They have venom and use it on insects, but it is not medically significant for humans or pets. No serious envenomation has been recorded despite how common and conspicuous these spiders are. A bite is a rare defensive act with only mild, short-lived local effects.
What happens if a banana spider bites you?
A bite from Nephila clavipes feels much like a bee sting: immediate sharp pain, a small red weal and sometimes brief swelling that fades within hours. Wash the site and use a cold pack. Note that the name banana spider is also used for the genuinely dangerous Brazilian wandering spider.
Where are Nephila clavipes spiders found?
From the southeastern United States — Florida, the Gulf coast, coastal Carolina and eastern Texas — south through Mexico, Central America and the Caribbean to northern Argentina. They favour warm, sheltered forest edges, clearings and trails, and cannot survive freezing winters.
Is Nephila clavipes an endangered species?
No. It has never been assessed by the IUCN and is abundant throughout a very large range. Some older articles describe it as threatened or Red Listed, which is simply an error. The species is common enough to be a familiar sight along trails in Florida and the tropics.
Is the spider still called Nephila clavipes?
Both names are in use. A 2019 phylogenomic study transferred the species to the genus Trichonephila, so the formal current name is Trichonephila clavipes. Nephila clavipes remains the name in most field guides, older literature and everyday use, and refers to exactly the same spider.
Do they rebuild their webs every day?
No. Unlike most orb weavers, which take the web down and respin it nightly, this species maintains a semi-permanent structure, replacing damaged sections piece by piece. A single web with its barrier silk can stand for weeks in the same gap between trees.
