The Ground Spider (Gnaphosidae (family)) is dark brown to black or gray; varies by species and typically measures 1/4–3/4 inch body. Ground spiders (family Gnaphosidae) are a large and diverse family of fast-moving, nocturnal hunting spiders found throughout Arizona. They are typically small to medium-sized (1/4–3/4 inch), dark bro.

The Ground Spider is generally low-risk, but caution is still advised. Not medically significant. Completely harmless.

In Arizona, ground spiders are most often encountered in the following situations: Fast-moving dark brown or black spider on the ground at night. Found under rocks, bark, or debris during the day. Cylindrical abdomen with forward-pointing spinnerets.

The Ground Spider is most active during: Year-round; nocturnal. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.

Reduce ground-level clutter and debris. Seal gaps under doors.

Perimeter treatments if populations are high indoors. Generally not a pest concern.

If you spot a Ground Spider indoors, avoid handling it directly. Capture it under a glass if possible for identification, or photograph it for reference. Contact Pest Control Bros for a professional inspection — we can confirm the species, assess the severity of the infestation, and recommend targeted treatment.