Animal field guide
Yellow Sac Spider
Cheiracanthium punctorium
A hunting spider of warm grassland, best known for the nursery the female builds. Before laying, she bends the tops of tall grasses or herbs together into a closed ball a few centimetres across, lines it with dense silk and seals herself inside with her eggs.
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Get AnimalDexYellow Sac Spider at a glance
Arachnid · Europe · Warm · Front legs clearly the longest of · Relatively common
Known for: Orange to reddish-brown carapace, Reddish chelicerae ending in black fang tips, Front legs clearly the longest of the four pairs, Adults up to about 15 mm long
Animal field guide
Yellow Sac Spider
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A hunting spider of warm grassland, best known for the nursery the female builds. Before laying, she bends the tops of tall grasses or herbs together into a closed ball a few centimetres across, lines it with dense silk and seals herself inside with her eggs.
Native range
Natural range, not this capture location
Warm, dry, sunny open ground with tall grasses and herbs: meadows, dry grassland, heath, fallow fields, road verges and railway embankments, mainly in the lowlands.
Search near meAnimalDex stats
Dominance
12
Speed
22
Size
4
Intelligence
20
Rarity
15%
Total
73
Size scale
STEP 2 · PROVE IT
STEP 3 · BATTLE & FUSE
Understand the animal
Understand the Yellow Sac Spider
Factual biology first: what this animal is like, where it lives, how it survives, and why those traits exist.
01
Introduction to Yellow Sac Spider
A hunting spider of warm grassland, best known for the nursery the female builds. Before laying, she bends the tops of tall grasses or herbs together into a closed ball a few centimetres across, lines it with dense silk and seals herself inside with her eggs.
How to identify a Yellow Sac Spider
- Orange to reddish-brown carapace, brighter than the abdomen
- Reddish chelicerae ending in black fang tips
- Front legs clearly the longest of the four pairs
- Adults up to about 15 mm long
Why Yellow Sac Spider are interesting
- Its bite is one of the few from spiders in its range that easily pierces human skin, causing burning pain and local swelling that usually fades within days.
- It has been found further north than before in recent decades, a change often linked to warmer summers.
- It belongs to the family Cheiracanthiidae, and was long placed with other sac spiders in Clubionidae.
- With no web to signal a catch, it probably relies more on touch and vibration than on sight when hunting at night.
02
Adaptations and biological abilities
03
Why does Yellow Sac Spider behave this way?
- Orange to reddish-brown carapace, brighter than the abdomen
- Reddish chelicerae ending in black fang tips
- Front legs clearly the longest of the four pairs
- Adults up to about 15 mm long
Hunts at night from late spring into autumn and spends the day in a small silk tube spun in a folded leaf or among grass heads. Young spiders pass the winter inactive in thicker silk cells low in grass tussocks or plant litter.
04
Why Warm?
Habitat: Warm, dry, sunny open ground with tall grasses and herbs: meadows, dry grassland, heath, fallow fields, road verges and railway embankments, mainly in the lowlands.
Native range: Europe, Central Asia
Native range
Natural range, not this specific capture location.
Warm, dry, sunny open ground with tall grasses and herbs: meadows, dry grassland, heath, fallow fields, road verges and railway embankments, mainly in the lowlands.
05
Why this diet?
An active hunter that builds no capture web. At night it roams grass stems and leaves, seizing insects and other small arthropods and subduing them with a quick venomous bite.
06
Activity, rest, and lifespan
Hunts at night from late spring into autumn and spends the day in a small silk tube spun in a folded leaf or among grass heads. Young spiders pass the winter inactive in thicker silk cells low in grass tussocks or plant litter.
About one year: young hatch in late summer, overwinter as juveniles, mature the next summer and die after breeding.
07
Yellow Sac Spider reproduction
Mating takes place in early summer. The female guards her egg sac inside the sealed nest for weeks without feeding and usually dies there; the spiderlings have been reported to feed on her body before they disperse.
Females are larger, with a stout, pale olive-yellow abdomen. Males are smaller and slimmer, with longer legs, longer projecting chelicerae and swollen palps.
08
Predators, threats, and defense
Likely predators, as for other grassland hunting spiders, include birds, spider-hunting wasps and other spiders. Its main defence is keeping still and out of sight among grass stems and leaves.
09
Conservation and rarity
Rarity: Relatively common · 15/100. AnimalDex canonical rarity score: 15/100, maintained by the live indexed species profile.
- Observe from a respectful distance and avoid changing the animal's behavior.
- Do not block feeding, shelter, nesting, or travel routes.
- Use a live camera capture without handling or staging wildlife.
Speak to the animal
Speak to the Yellow Sac Spider
It answers as itself: ask about how it lives, or bring it something of yours and hear what it would do, from its own Power.
Anonymous: 3/day. Signed-in: 10/day. Pro: 100/day.
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Compare the Yellow Sac Spider
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Battled in the Arena
No one has taken a Yellow Sac Spider into an Arena battle yet. Battles players fight with this animal in the AnimalDex app show up here.
Where to find them
Where to find Yellow Sac Spider
To find Yellow Sac Spider in the wild, focus on the exact habitat patches that match its body design and daily behavior, not just the broad country where it exists. You usually do better by working one good piece of habitat inside europe, Central Asia than by covering too much ground.
- Open grassland edges, lightly wooded plains, or raised ground where you can scan long distances
- Protected habitat blocks within europe, Central Asia
Scientific name
Cheiracanthium punctorium
Category
Arachnid
Habitat
Warm, dry, sunny open ground with tall grasses and herbs: meadows, dry grassland, heath, fallow fields, road verges and railway embankments, mainly in the lowlands.
Rarity
Relatively common · 15/100
Native range
Europe, Central Asia
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