California Trapdoor Spider

Bothriocyrtum californicum · Order: Araneae · Family: Halonoproctidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
California Trapdoor Spider
Photo: Marshal Hedin, CC BY

Males are smaller than females. It lives in the United States.

Source: Wikipedia

Size

Males are smaller than females.

Source: Wikipedia

Where it lives

It is found in the United States.

Source: Wikipedia

Where it comes from

It is native to the United States.

Source: Wikipedia

Where it is found in the US

Recorded in 1 of 51 states and DC. Most records: California.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America. Source: iNaturalist

Months it is reported in the US

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Source: GBIF

More photos

California Trapdoor Spider photo 2
Photo: Marshal Hedin, CC BY-SA
California Trapdoor Spider photo 3
Photo: Marshal Hedin, CC BY-SA
California Trapdoor Spider photo 4
Photo: Marshal Hedin, CC BY-SA
California Trapdoor Spider photo 5
Photo: Cory Butterfield, CC BY

Questions people ask

Where is the California trapdoor spider found?

It occurs in the United States.

Source: Wikipedia

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Bothriocyrtum_californicum

Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia

Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.