Castianeira trilineata

Castianeira trilineata · Order: Araneae · Family: Corinnidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Castianeira trilineata
Photo: Gordon C. Snelling, CC BY

It lives in the United States and Canada.

Source: Wikipedia

How to recognize it

This spider mimics ants in appearance.

Source: Wikipedia

Where it lives

It is found across the United States and Canada.

Source: Wikipedia

Where it comes from

Its native range includes the United States and Canada.

Source: Wikipedia

Where it is found in the US

Recorded in 15 of 51 states and DC. Most records: Texas, Ohio, Illinois, Wisconsin, Florida, Louisiana, Massachusetts, Tennessee.

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

Source: GBIF

Status: native in North America; native in Canada. Source: iNaturalist

Months it is reported in the US

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Source: GBIF

More photos

Castianeira trilineata photo 2
Photo: Gordon C. Snelling, CC BY
Castianeira trilineata photo 3
Photo: F. LaBry, CC BY
Castianeira trilineata photo 4
Photo: Ray Fisher, CC BY
Castianeira trilineata photo 5
Photo: Blake Bringhurst, CC BY

Same family (Corinnidae)

Spotted Ground Swift SpiderSpotted Ground Swift SpiderNyssus coloripesLong-palped Ant-mimic Sac SpiderLong-palped Ant-mimic Sac SpiderCastianeira longipalpaTwo-banded Ant-mimic Sac SpiderTwo-banded Ant-mimic Sac SpiderCastianeira cingulataCastianeira thaliaCastianeira thaliaVariegated Ant-mimic Sac SpiderVariegated Ant-mimic Sac SpiderCastianeira variata

Sources

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

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

Text written 2026-10-28 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-28.

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.