Grass Spider, Funnel-Weaver
Agelenopsis aperta or similar Agelenidae species
Agelenidae (Funnel-Weavers), Order Araneae. Key family characteristics include long spinnerets and the construction of sheet-like webs ending in a funnel retreat.
Physical Description
The spider exhibits an elongated, somewhat robust body with a distinct oval-shaped abdomen and a clearly defined cephalothorax. The surface has a fine layer of hairs, giving it a slightly matte texture. Prominent spinnerets can be seen extending from the rear of the abdomen.
Size Estimate
Body length is estimated around 10 to 15 millimeters, with a total leg span reaching roughly 25 to 35 millimeters, typical for an adult or sub-adult funnel-weaver.
Coloration & Markings
The coloration consists of mottled shades of brown, tan, and gray. The carapace typically features dark longitudinal stripes running along the dorsal side, while the abdomen may display a lighter median band bordered by darker patches.
Web Type
Builds a sheet web that lies horizontally close to the ground or among vegetation, featuring a tubular retreat (funnel) at one end where the spider waits for prey.
Eye Arrangement
Eyes are arranged in two distinct rows of four, total of eight eyes, all roughly similar in size, clustered tightly on the anterior portion of the carapace.
Leg Characteristics
Legs are moderately long, somewhat stout, equipped with visible spines, and feature faint darker banding. They are held in a sprawling posture, ready for rapid sprinting.
Venom & Safety Information
Venom Information
Contains mild, non-lethal neurotoxic venom primarily targeted at immobilizing small insect prey.
Medical Significance
Not medically significant. Bites are extremely rare, generally causing only minor localized pain and slight swelling akin to a mild bee sting, requiring no professional medical treatment.
Safety Recommendations
No special safety measures needed. If found indoors, they can be gently guided into a container and relocated outside to a garden or grassy area.
Habitat & Behavior
Habitat & Range
Found widely across North America in grasslands, fields, gardens, and along the exterior walls of buildings where they establish webs near the ground.
Behavior & Temperament
Highly alert and exceptionally fast runners. When disturbed on their web, they rapidly retreat into their funnel. They are non-aggressive toward humans and will only bite if tightly trapped against the skin.
Diet & Prey
Feeds primarily on ground-dwelling insects such as crickets, beetles, grasshoppers, and flies, which become trapped on the horizontal sheet web.
Seasonal Activity
Most active during late spring through autumn, with mating occurring in late summer and early fall before adults perish with the onset of winter frost.
Description
This specimen is a classic representative of the funnel-weaver family, showcasing earth-toned camouflage and an agile build. Frequently encountered resting near their signature sheet webs in grassy patches, these spiders are efficient predators of garden insects and pose no threat to humans.
Key Features
Distinguished by prominent rear spinnerets, distinct longitudinal stripes on the carapace, and association with a horizontal sheet web ending in a funnel retreat.
Similar Species
Can be confused with wolf spiders (Lycosidae) or nursery web spiders (Pisauridae), but distinguished by the presence of clearly visible, elongated spinnerets and the distinct funnel web.
Life Cycle
Females construct silk egg sacs in sheltered spots during autumn, protecting hundreds of eggs until they hatch in the spring. Spiderlings mature through successive molts over a single season.
Ecological Importance
Acts as a primary controller of insect populations in grasslands and gardens, serving as an important prey item for birds and small mammals.
Conservation Status
Not evaluated by the IUCN, but populations are abundant, widespread, and stable across their native range.
Interesting Facts
Grass spiders possess some of the fastest acceleration rates among terrestrial invertebrates when dashing out of their funnel retreats to capture prey.
Photography Tips
Photograph from a slightly elevated angle in natural light to capture the dorsal markings and carapace stripes. Maintain a calm approach to avoid startling the spider into hiding.
Identified: 2026-08-10T18:14:51.742796