European Tortoise Bug

Eurygaster maura · Order: Hemiptera · Family: Scutelleridae

Damages trees, gardens or crops. It damages a range of grain crops such as wheat, rye, barley, oats, corn and millet.

Source: Wikipedia

European Tortoise Bug
Photo: Konrad Kałużyński, CC BY

The European Tortoise Bug is a small, oval-shaped true bug about 8 to 11 mm long. It lives on calcareous grasslands and is common across Europe, parts of Asia and North America. Adults appear from May to August, become mature in July, and the species has one generation per year.

Source: Wikipedia

How to recognize it

Its ground colour is mainly brown, but can also be light gray or black.

Source: Wikipedia

Size

Adults measure between 8 and 11 mm in length.

Source: Wikipedia

Is it a pest in the house?

Both adults and larvae are harmful to crops, making them a serious agricultural pest.

Source: Wikipedia

Where it lives

It prefers calcareous grasslands that have wild grasses.

Source: Wikipedia

Life cycle

Eurygaster maura has one generation per year (univoltine). After five molts the bugs are fully developed and overwinter in leaf litter.

Source: Wikipedia

When you see it

You can find them from May to August, with adults emerging in July.

Source: Wikipedia

Lookalikes

It resembles Eurygaster testudinaria but is slightly smaller, has a smoothly rounded shape and less protruding hind corners.

Source: Wikipedia

Questions people ask

How can I identify a European Tortoise Bug?

Look for an oval, slightly convex body about 8 to 11 mm long, a triangular smoothly rounded head with small compound eyes, and a brown to gray or black ground colour.

Source: Wikipedia

When are these bugs most likely to appear?

They are present from May through August, becoming adults in July.

Source: Wikipedia

What crops are at risk from this bug?

Wheat, rye, barley, oats, corn and millet can be damaged by feeding adults and larvae.

Source: Wikipedia

How does this bug differ from the similar Eurygaster testudinaria?

It is slightly smaller, has a smoother rounded shape, and its hind corners are less protruding.

Source: Wikipedia

Same family (Scutelleridae)

Tortoise BugTortoise BugEurygaster testudinariaDamages trees, gardens or cropsHibiscus Harlequin BugHibiscus Harlequin BugTectocoris diophthalmusDamages trees, gardens or cropsOcellated shield bugOcellated shield bugCantao ocellatusDamages trees, gardens or cropsMetallic Shield BugMetallic Shield BugScutiphora pedicellataGreen Jewel BugGreen Jewel BugLampromicra senator

Sources

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

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

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

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