Ground Spider

Zelotes subterraneus

Gnaphosidae (Ground Spiders), Order Araneae. Characterized by cylindrical spinnerets and nocturnal habits.

Elongated body with a dark brown to black cephalothorax and abdomen, distinct cylindrical anterior spinnerets, smooth texture with minimal hair.

Body length around 6 to 10 millimeters with a leg span of approximately 15 to 20 millimeters. Appears to be an adult or sub-adult specimen.

Uniform dark brown to black coloration with lighter brown legs, sometimes featuring subtle greyish or brownish abdominal markings.

Does not build a web to catch prey; instead, constructs a silk retreat or sac under rocks, logs, or debris during the day.

Eight eyes arranged in two distinct rows, typically oval to circular, with the posterior median eyes often irregular or flattened.

Moderately short and sturdy legs designed for fast running, featuring noticeable spination and subtle banding.

Non-toxic to humans. Venom is specialized for subduing small insect prey rapidly.

Harmless to humans. Bites are extremely rare, non-medically significant, and may cause only mild, localized irritation similar to a mild pinprick.

Safely relocate using a glass and a piece of paper if found indoors. Wear gloves when moving garden rocks and woodpiles.

Found across North America and Europe, primarily under rocks, leaf litter, logs, and occasionally wandering into homes.

Nocturnal hunter with very fast, erratic movements. Generally non-aggressive and will flee rather than bite when disturbed.

Active hunter preying on various ground-dwelling insects, including ants, beetles, and other spiders.

Most active during the warm spring and summer months, often seeking shelter indoors during seasonal transitions.

A swift, dark ground dweller that spends its days hidden under protective cover and emerges at night to hunt down insect prey across the soil.

Distinctive cylindrical spinnerets at the rear of the abdomen, dark smooth body, and rapid, darting movements.

Other Gnaphosid ground spiders and wolf spiders (Lycosidae), but distinguished by the prominent cylindrical spinnerets.

Females produce papery egg sacs hidden beneath stones or bark. Spiderlings hatch and disperse, maturing over the course of a year.

Serves as an effective natural controller of ground-dwelling insect populations in gardens and natural ecosystems.

Not evaluated by the IUCN, but populations are widespread, secure, and abundant across their natural range.

Ground spiders are exceptionally fast sprinters and build temporary silk sleeping bags each night before resuming active hunting.

Use macro lenses with natural lighting or a diffuser to capture details of the spinnerets and eye arrangement without startling the spider.

Identified: 2026-10-01T01:28:51.998847