Maritime Running Crab Spider

Tibellus maritimus · Order: Araneae · Family: Philodromidae

Also called: Grooved Running Crab Spider

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Maritime Running Crab Spider
Photo: Dan MacNeal, CC BY

The Maritime Running Crab Spider lacks the two dark spots on its abdomen that similar Tibellus species have, making it easy to tell apart. It occurs across North America, Europe, the Caucasus, Russia, Central Asia and China.

Source: Wikipedia

Where it comes from

Its distribution includes North America, Europe, the Caucasus, Russia, Central Asia and China.

Source: Wikipedia

Where it is found in the US

Recorded in 19 of 51 states and DC. Most records: Alaska, Colorado, Maine, North Dakota, California, Montana, Minnesota, Illinois.

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

Source: GBIF

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

Months it is reported in the US

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Source: GBIF

More photos

Maritime Running Crab Spider photo 2
Photo: Tanner Barnharst, CC BY

Same family (Philodromidae)

Nearctic White-striped Running Crab SpiderNearctic White-striped Running Crab SpiderPhilodromus rufusEurasian Running Crab SpiderEurasian Running Crab SpiderPhilodromus disparOblong Running SpiderOblong Running SpiderTibellus oblongusTurf Running SpiderTurf Running SpiderPhilodromus cespitumMetallic Crab SpiderMetallic Crab SpiderPhilodromus marxiThanatus formicinusThanatus formicinus

Sources

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

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

Text written 2026-10-27 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-27.

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.