Metrioptera roeselii

(Hagenbach, 1822)

Roesel's Bush-cricket

Metrioptera roeselii, commonly known as Roesel's Bush-, is a -sized bush-cricket to continental Europe that has undergone significant range expansion in northern Europe since the 1980s. The is characterized by a distinctive -green coloration with a prominent yellow stripe along the margin of the . It exhibits , with both short-winged () and long-winged () forms occurring in ; the long-winged form is associated with range expansion. The species has been to Britain and Scandinavia, with genetic evidence indicating human-mediated in some isolated populations.

Metrioptera roeselii Female by Julius Rückert.. Used under a CC BY-SA 3.0 license.

Roeseliana roeselii (Metrioptera roeselii) (Roesel's bush-cricket) (male), Arnhem, the Netherlands by Bj.schoenmakers. Used under a CC0 license.

Pronunciation

How to pronounce Metrioptera roeselii: //mɛˌtriˈɒptɛra roʊˈzɛli.aɪ//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

are distinguished from similar bush- by a bright or cream-colored stripe running along the edge of the and continuing along the bases. The body is predominantly green to yellow-green. The shows wing : most individuals are short-winged with wings barely reaching the middle of the , but a fully winged form occurs, particularly at the expanding range margins. The is relatively short and curved. The song is a high-pitched, continuous, mechanical-sounding buzz produced by of the .

Images

Habitat

Rough grassland, hay meadows, pastures, and agricultural landscapes with grassland edges. In the UK, found in suburban parks, neglected grasslands, and roadside verges. Occupies extensively used agricultural landscapes in continental Europe.

Distribution

to continental Europe from France and Germany eastward; has expanded its range northward and westward since the 1980s. Now established throughout England, Wales, and southern Scotland, with recent records in northern England up to 300 m elevation. Also recorded in Scandinavia (Sweden, Denmark) and the Baltic region. Isolated in northern Europe show genetic signatures consistent with human-mediated introduction.

Seasonality

active from July through October in northern Europe. develop through spring and early summer.

Life Cycle

are laid in soil or vegetation using the female's sword-like . hatch in spring and resemble miniature without ; they develop through successive molts to reach adulthood by mid-summer. become visible in later . The exhibits development with no pupal stage.

Behavior

Males produce a continuous, high-pitched calling song to attract females. Mating occurs with the female mounting the male; males transfer a that remains partly visible externally and is often consumed by the female after mating. The long-winged form shows enhanced capability and is associated with of new areas at the range margin. Short-winged individuals are effectively flightless and show limited dispersal.

Ecological Role

As a in grassland , contributes to and serves as for birds, small mammals, and . The ' range expansion in northern Europe has been used as a biological indicator of climate warming effects on distributions.

Human Relevance

Subject of ecological research on range expansion, climate change impacts, and invasion biology. Popular with citizen scientists; records contribute to the and Related Recording Scheme for Britain and Ireland. The ' distinctive song and appearance make it readily identifiable by amateur naturalists.

Similar Taxa

Conocephalus fuscusLong-winged Conehead has a more slender body, longer in all individuals, and a different song pattern; lacks the prominent stripe of M. roeselii.
Leptophyes punctatissimaSpeckled Bush- is smaller, speckled with dark markings, and has a more delicate build; produces a short, intermittent song rather than continuous buzz.
Tettigonia viridissimaGreat Green Bush- is substantially larger, has a long, straight , and lacks the stripe; song is a loud, intermittent chirp.