Goldenrod Crab (Misumena vatia)
The goldenrod crab spider is the small white or yellow spider that sits motionless in the middle of a daisy with its front legs held open like a pair of calipers. It builds no capture web at all. Instead the female slowly repaints herself to match the petals she is sitting on, then ambushes bees and butterflies several times her own weight.
By Dr. James WatuwaPublished January 27, 2019Updated September 13, 2026✓ Reviewed by Dr Richard J. Pearce (PhD)
In this guide
Physical description and identification
Everything about Misumena vatia is built around staying invisible on a flower until something edible lands. The body is squat and flattened, and the first two leg pairs are far longer and heavier than the back two — held open and angled forward, they work as a spring-loaded trap rather than as running gear. Because the spider walks sideways and backwards as readily as forwards, the family earned the name crab spiders.
Adults
- Size: females measure 8–10 mm in body length, excluding legs; males are dramatically smaller at 4–5 mm, a size gap seen in few other temperate spiders.
- Colour: adult females are white, pale greenish or bright yellow, smooth and waxy rather than hairy, many with a pair of red streaks down the sides of the abdomen. Males look like a different animal: dark reddish-brown carapace and front legs, pale yellow hind legs, small whitish abdomen with reddish marks.
- Eyes: eight small eyes in two strongly curved rows, the outer ones raised on low bumps. None is enlarged, which rules out jumping spiders at a glance.
- Distinctive features: a glossy hairless body, no white ridge across the face — that ridge is what separates the related Misumenoides — and long front legs held permanently apart in a V.
Eggs and egg sac
A mated female stops feeding in midsummer, binds a broad leaf into a folded chamber with silk, and lays a flattened papery sac of several dozen to well over a hundred eggs inside it. She seals herself in beside it and does not leave again, guarding the sac without eating for about three weeks, and dies within days of the spiderlings breaking out.
Spiderlings
Hatchlings are pale translucent miniatures with the same crab-like posture. They scatter on silk lines or by ballooning, feed on thrips and aphids in low vegetation, and reach about 5 mm by autumn, when they overwinter in leaf litter and grass tussocks. The final moult falls around May, and new adults are on the flowers by early summer.
Hunting instead of a web
The goldenrod crab spider builds no capture web of any kind. It still spins silk constantly — for drag-lines, moulting pads, mating and the egg chamber — but never as a snare; see our guide to spider webs for the contrast with web-building families. In place of silk it uses stillness, settling head-down in a flower head with the long leg pairs held apart. When a bee or butterfly lands within reach the legs snap shut and the fangs go in behind the head, and the venom works fast enough that a 9 mm spider can kill a honey bee without a struggle.
The famous colour change belongs to the adult female alone: a yellow ommochrome pigment is secreted into the outer cuticle, then withdrawn and excreted to return to white. Neither direction is quick — about 10 to 25 days to yellow, five or six back to white — so a spider on the wrong flower has to walk to a better one.
Where the goldenrod crab spider lives
Misumena vatia is Holarctic, occupying the northern temperate belt right around the globe: most of North America from southern Canada southward, almost all of Europe including the United Kingdom, and temperate northern Asia. Few spiders of its size have a range that wide.
The habitat requirement is straightforward: open sunny ground with flowers that insects visit. Meadows, old fields, prairie remnants, roadside verges, hedge banks, clearings and garden borders all qualify. Despite the common name, goldenrod is only one hunting platform among many; daisies, asters, milkweed, yarrow and umbels are used just as heavily. Closed forest is avoided, because the whole strategy depends on pollinators.
Individuals move surprisingly little. A female may hold one flower head for days and leave only when hunting fails, which — with the slow colour change — is why a mismatched white spider on a yellow flower is such a common midsummer sight.
Are goldenrod crab spiders venomous?
Yes. Like almost every spider, Misumena vatia is venomous, and it depends on that venom completely: with no web to hold prey and no bulk to wrestle with, it must stop a struggling bee within a second or two. The venom is unusually effective against flower visitors for a spider this small, which is why it takes prey heavier than itself.
Effective on insects is not the same as dangerous to people. There is no evidence the venom is medically significant to humans or pets. The species is unrelated to the recluse spiders or the widow spiders, and lacks both the tissue-damaging enzymes of the first group and the potent neurotoxins of the second. Its fangs are also very short.
Can goldenrod crab spiders bite?
They can, but it almost never happens. The spider’s first defence is to sit absolutely still and its second is to drop off the flower on a drag-line. Biting is a last resort reserved for being squeezed, typically when someone picks a flower and closes a hand round the stem without looking.
Where a bite does land, the reported effect is a brief pinprick with slight redness that fades within minutes to a few hours. No swelling beyond the immediate spot, no systemic symptoms and no tissue damage have been documented. Wash the area with soap and water and leave it alone; a cold pack is enough if it feels sore. Spreading swelling, hives or breathing difficulty would indicate an allergic reaction rather than the venom, and warrants medical attention as after any insect sting.
Check before you worry: a pale spider with its front legs held open on a flower is a crab spider, not a recluse or a widow. A recluse has six eyes in three pairs, long thin legs and a violin mark, and lives in dark clutter, never on a bloom.
Ecological importance and behavior of the goldenrod crab spider
This is a pure sit-and-wait predator, and one of the most patient in the temperate fauna. A female can hold the ambush posture for hours without shifting a leg, with long gaps between meals broken by occasional very large catches. Because she picks flowers for their attractiveness to pollinators, the plant does the advertising for her.
Diet: honey bees, bumblebees, solitary bees, hoverflies and other flies, small butterflies and skippers, beetles and the odd wasp. Prey twice the spider’s mass is routine.
Natural predators: insectivorous birds, lizards, shrews, ants and larger spiders all take Misumena, and spider-hunting and mud-dauber wasps paralyse crab spiders to stock their nest cells. The pigment change has been shown to lower the spider’s visibility both to the ultraviolet-sensitive eyes of bees and to the very different colour vision of birds.
Prey-predator dynamics: the effect on flowers is double-edged. A resident crab spider removes pollinators and can reduce seed set on that plant, but it also removes flower-feeding pests, and pollinators learn to avoid blooms where a spider is visible.
Seasonal behaviour: adults appear from late spring, peak through midsummer and are largely gone by early autumn. Males mature earlier and spend their short adult lives wandering between flower heads. Females feed hard, mate, then commit everything to a single egg sac. The full cycle takes a year, though a late-emerging spiderling in the north may need two seasons.
Relationship with humans: harmless and mostly welcome; unsprayed borders and native perennials do more for it than anything else.
Similar spiders and how to tell them apart
| Spider | How it differs from the goldenrod crab spider |
|---|---|
| White-banded crab spider (Misumenoides formosipes) | The closest confusion. It also sits on flowers and shifts between white and yellow, but carries a distinct white ridge across the face below the eyes. Misumena has no such ridge. |
| Other Misumenoides | Same white facial carina, and mostly Neotropical — away from the southern United States, a North American flower crab spider is far more likely to be Misumena vatia. |
| Green crab spider (Misumessus oblongus) | Consistently light green with a slender, kite-shaped abdomen and often red side bands. It does not perform the white-to-yellow change and is smaller and more elongate. |
| Misumessus | Narrow-bodied green flower hunters rather than the broad, rounded build of Misumena. |
| Green lynx spider | Bright green with long spiny legs and a pointed abdomen. It runs and leaps; a crab spider waits. |
| Jumping spiders | Compact and hairy with two huge forward-facing eyes; they stalk and pounce rather than hold a fixed ambush. |
Quick facts
| Distribution | Holarctic: North America south of the boreal forest, most of Europe, and temperate northern Asia. |
|---|---|
| Habitat | Meadows, old fields, prairie, roadsides, hedge banks and garden borders — anywhere with open, insect-visited flowers. |
| Diet | Bees, hoverflies and other flies, butterflies, skippers and beetles taken at the flower. |
| Lifespan | About one year in most populations, two where the season is short. Females die soon after their spiderlings hatch. |
| Predators | Birds, lizards, shrews, ants, larger spiders and spider-hunting wasps. |
| Web | None for hunting; silk is used only for drag-lines, moulting, mating and the egg sac. |
| Colour change | Adult females only; about 10–25 days white to yellow, about 5–6 days yellow to white. |
| IUCN status | Not evaluated; common and widespread throughout its range. |
Did you know?
- The species was described by Carl Clerck in 1757, making it one of the oldest scientific names in arachnology still in use.
- The colour change is asymmetric: painting on the yellow pigment takes up to three and a half weeks, while stripping it back to white takes under one.
- It is a textbook case of camouflage that works on two completely different visual systems at once — the ultraviolet-sensitive eyes of bees and the four-cone colour vision of birds.
- A female regularly kills honey bees and bumblebees that outweigh her, something no comparable spider manages without a web to hold the prey still.
- The name goldenrod is misleading. The spider is at least as common on daisies, asters and umbels, and white individuals match goldenrod poorly anyway.
In summary, the goldenrod crab spider is the most accomplished ambush hunter on a summer flower: a webless, slow-moving, colour-shifting predator that punches far above its weight against bees, and one that poses no meaningful risk to the person holding the flower.
Frequently asked questions about the goldenrod crab spider
How do you tell a female goldenrod crab spider from a male?
Size settles it immediately. Females are 8 to 10 mm and either white, pale green or yellow, often with red streaks down the sides of the abdomen. Males are only 4 to 5 mm, with a dark reddish-brown carapace, dark long front legs, pale hind legs and a small whitish abdomen. Only the female changes colour.
How does a goldenrod crab spider change colour?
The female secretes a yellow pigment into the outer layer of her cuticle to turn yellow, and withdraws or excretes it to return to white. The process is slow and chemical rather than instant: roughly 10 to 25 days to become yellow, and about 5 to 6 days to become white again.
Do goldenrod crab spiders spin webs to catch prey?
No. They build no capture web at all. They still spin silk, using it for safety drag-lines, moulting, mating and the egg sac, but prey is caught by sitting motionless in a flower and grabbing whatever lands within reach of the long front legs.
Where does a goldenrod crab spider lay its eggs?
The female folds a broad leaf into a chamber with silk, lays a flattened egg sac inside and seals herself in with it. She guards the sac for about three weeks without feeding. The arrangement is well hidden, which is why egg sacs are rarely noticed in the open.
How long do goldenrod crab spider eggs take to hatch?
About three weeks from laying to emergence, with the female standing guard over the sac for the whole period. She is badly worn down by then and normally dies within a few days of the spiderlings breaking out and dispersing.
Are goldenrod crab spiders venomous to humans?
They are venomous, and their venom is remarkably effective on bees and other flower visitors, but it is not medically significant to people or pets. The species is unrelated to recluse and widow spiders and has no history of causing anything beyond momentary local pain.
Can a goldenrod crab spider bite a person?
It can, but only if it is pressed or squeezed, for example inside a picked flower. Bites are rare and produce at most a brief pinprick with slight redness that fades within hours. Washing the spot is enough, and no medical treatment is needed.
What do goldenrod crab spiders eat?
Whatever visits the flower they are sitting on: honey bees, bumblebees, solitary bees, hoverflies, other flies, small butterflies, skippers, beetles and occasional wasps. Prey twice the spider's own weight is taken routinely, because the venom immobilises an insect before it can pull free.
Where are goldenrod crab spiders found?
Across the northern temperate world: most of North America from southern Canada southward, almost all of Europe including Britain, and temperate northern Asia. Within that range they occupy sunny, flower-rich open ground such as meadows, roadsides, field margins and garden borders.
Are goldenrod crab spiders good or bad for a garden?
Mostly good and never harmful. They remove flower-feeding pests and are food for birds and wasps, though they also take some pollinators from the plants they sit on. They need no control at all; unsprayed native flowers and an unmown corner are all they ask for.
References
- World Spider Catalog (2026). Misumena vatia (Clerck, 1757). Natural History Museum Bern. wsc.nmbe.ch/spec-data/47670/taxon
- Théry, M. & Casas, J. (2002). Predator and prey views of spider camouflage. Nature 415: 133. doi.org/10.1038/415133a
