Grass Spiders
ExploreInvertebrate
Grass Spiders
agelenopsis
Grass spiders of the genus Agelenopsis are highly active, beneficial arachnids famous for weaving flat, sheet-like webs across lawns, fields, and low shrubbery. Unlike typical orb-weavers, these spiders do not rely on sticky silk to trap their prey. Instead, they construct a non-sticky platform with a funnel-shaped retreat at one end. They wait patiently in this dark tunnel until an unsuspecting insect lands on the web, then dash out with lightning speed to subdue it. They are harmless to humans, rarely biting unless squeezed, and are beneficial allies in gardens by consuming vast quantities of pest insects.
Habitat: Typically found in grassy lawns, meadows, low-lying shrubs, and around building foundations where they can secure their sheet webs.
Appearance
Grass spiders are medium-sized arachnids, typically brownish or grayish in color with two prominent, dark longitudinal stripes running down the length of the cephalothorax. Their abdomen features a lighter, chevron-like pattern and, most distinctively, a pair of exceptionally long, finger-like spinnerets protruding from the rear. Their long, hairy legs are often patterned with dark bands, giving them a slightly mottled appearance that blends perfectly with dry grass and leaf litter.
KingdomAnimaliaPhylumArthropodaClassArachnidaOrderAraneaeFamilyAgelenidae
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
Dewy mornings are the best time to see their webs, as water droplets cling to the fine silk, revealing hundreds of hidden funnels across a single lawn.
Their webs are entirely non-sticky, meaning they must rely purely on their fast-running abilities to catch prey before it flies away.
They have extremely long spinnerets at the back of their abdomen, which act like precision nozzles to lay down their flat sheets of silk.
Special abilities
Ability
Lightning Sprint
Relying on speed rather than sticky silk, these spiders can run across their webs at incredibly high velocities to intercept prey.
Ability
Seismic Detection
They use highly sensitive hairs on their legs to instantly pinpoint the exact location of vibrations made by insects landing on their web.
Ability
Double-Ended Retreat
They weave a funnel-like tunnel that has a secondary escape opening at the back, allowing them to flee if a predator enters the front.
Measurements & details
- Length
- 1-2 cm
- Weight
- 0.0001-0.001 kg
- Lifespan
- 1 years
- Top Speed
- 2 km/h
- Clutch Size
- 50-200
- Incubation
- 20-30 days
Diet & Feeding
Grass spiders sit inside their funnel retreats and rush out to capture insects that land on the flat web sheets.
Age differences: Young spiderlings consume tiny insects like aphids, while mature adults tackle larger prey like grasshoppers.
Primary Foods
- Grasshoppers
- Moths
- Flies
- Beetles
- Ants
Foraging Method
- Ambush
Ecological connections
hunts
Differential Grasshopper
Melanoplus differentialis
Preys on grasshoppers that land on its web.
eaten by
American Robin
Turdus migratorius
Commonly preyed upon by insect-eating birds.
eaten by
Blue Mud Wasp
Chalybion californicum
Paralyzed and dragged away by solitary wasps to feed their larvae.
Traits
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Also known as
No aliases listed yet.
Collections
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Grass Spiders?
The easiest way to identify Grass Spiders is to use the Snappit nature identifier app.
How long is Grass Spiders?
1-2 cm
How much does Grass Spiders weigh?
0.0001-0.001 kg
How long does Grass Spiders live?
1 years
How fast can Grass Spiders move?
2 km/h
What does Grass Spiders eat?
Grass spiders sit inside their funnel retreats and rush out to capture insects that land on the flat web sheets.
Where is Grass Spiders usually found?
Typically found in grassy lawns, meadows, low-lying shrubs, and around building foundations where they can secure their sheet webs.
How does Grass Spiders hunt?
Ambush
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