Marsh Lady Beetle

Anisosticta bitriangularis · Order: Coleoptera · Family: Coccinellidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Marsh Lady Beetle
Photo: iNaturalist user, CC0

Adult marsh lady beetles measure roughly 3 to 4 mm in length. They are found across Europe, northern Asia (excluding China), and North America from Labrador to New Jersey, extending west to Alaska, California and British Columbia.

Source: Wikipedia

Size

Adults are about 3 to 4 mm long.

Source: Wikipedia

Where it is found in the US

Recorded in 23 of 51 states and DC. Most records: Vermont, Alaska, Minnesota, Illinois, Michigan, Washington, New York, Wisconsin.

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

Marsh Lady Beetle photo 2
Photo: iNaturalist user, CC0
Marsh Lady Beetle photo 3
Photo: Julia Pupko, CC BY
Marsh Lady Beetle photo 4
Photo: Julia Pupko, CC BY
Marsh Lady Beetle photo 5
Photo: Jason Hill, CC BY

Same family (Coccinellidae)

Asian Lady BeetleAsian Lady BeetleHarmonia axyridisCan biteSeven-spotted Lady BeetleSeven-spotted Lady BeetleCoccinella septempunctataConvergent Lady BeetleConvergent Lady BeetleHippodamia convergensCan biteFourteen-spotted Lady BeetleFourteen-spotted Lady BeetlePropylea quatuordecimpunctataVariegated Lady BeetleVariegated Lady BeetleHippodamia variegataSpotless Lady BeetleSpotless Lady BeetleCycloneda sanguinea

Sources

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

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

Text written 2026-10-25 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-25.

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.