Round-keeled Rhyzobius

Rhyzobius chrysomeloides · Order: Coleoptera · Family: Coccinellidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Round-keeled Rhyzobius
Photo: Paul Cook, CC BY

Adults are tiny, about 2.6 to 3.2 mm long and have a flattened, oval body with brown pronotum and reddish elytra marked with dark U-shapes.

Source: Wikipedia

How to recognize it

The beetle’s body is elongate oval and flattened; the pronotum is brown, the elytra are reddish with dark U-shaped patterns, and the antennae and legs are brown.

Source: Wikipedia

Size

Adults measure roughly 2.55 to 3.15 mm in length (about 0.10 to 0.12 in).

Source: Wikipedia

What it eats

Rhyzobius chrysomeloides is a predator that feeds on aphids.

Source: Wikipedia

Lookalikes

It resembles Rhyzobius litura but can be told apart by a broader prosternal keel and darker U-shaped elytral markings.

Source: Wikipedia

More photos

Round-keeled Rhyzobius photo 3
Photo: Paul Cook, CC BY
Round-keeled Rhyzobius photo 4
Photo: Donald Hobern, CC BY

Questions people ask

What does this beetle eat?

It preys on aphids.

Source: Wikipedia

How can I tell it apart from similar beetles?

It has a broader prosternal keel and darker U-shaped markings on the elytra compared with Rhyzobius litura.

Source: Wikipedia

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/Rhyzobius_chrysomeloides

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

Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.

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.

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