The Trapdoor Spider (Aptostichus / Bothriocyrtum spp.) is dark brown to black; robust build and typically measures Female: up to 1 inch body; Male: smaller. Trapdoor spiders (families Ctenizidae and Euctenizidae) are burrowing spiders that construct a silk-lined burrow in the soil topped with a hinged trapdoor made of silk, soil, and plant material. The s.

The Trapdoor Spider is generally low-risk, but caution is still advised. Not medically significant. Bites are rare and cause only minor localized pain. Not aggressive.

In Arizona, trapdoor spiders are most often encountered in the following situations: Circular trapdoor (1/2–1 inch diameter) flush with the soil surface, often camouflaged with soil and plant material. Wandering male spider in fall or winter. Burrow entrances in compacted desert soil.

The Trapdoor Spider is most active during: Year-round in burrows; males wander in fall and winter. 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.

Not a pest requiring control. Fascinating and beneficial desert predators.

No treatment necessary.

If you spot a Trapdoor 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.