Gastrophysa viridula is a species of leaf beetle in the family Chrysomelidae, commonly known as the green dock beetle.
Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Coleoptera
- Family: Chrysomelidae
- Subfamily: Chrysomelinae
- Genus: Gastrophysa
- Species: G. viridula
Description
Adult beetles are typically 4–6 mm in length. Their coloration ranges from bright green to metallic blue-green, often with a glossy sheen. The elytra (wing covers) are punctate and lack distinct striping, distinguishing them from some related species. Larvae are elongate, slender, and generally greenish, matching the foliage on which they feed.
Distribution
Gastrophysa viridula occurs throughout much of Europe, extending into parts of western and central Asia. Its range includes the United Kingdom, Ireland, France, Germany, the Scandinavian countries, and the Baltic states. Records also exist from the Caucasus region.
Habitat and Host Plants
The species is closely associated with plants in the family Polygonaceae, especially dock species (Rumex spp.) and knotweed (Polygonum spp.). Adults and larvae feed on the leaves, often causing noticeable skeletonization. They inhabit open meadows, riverbanks, roadside verges, and disturbed habitats where host plants are abundant.
Life Cycle
- Egg: Females lay eggs singly or in small clusters on the underside of host plant leaves.
- Larva: Upon hatching, larvae feed on leaf tissue for several weeks, undergoing several instars.
- Pupa: Pupation occurs in the soil or within leaf litter near the host plant.
- Adult: Emergent adults are active from late spring through early autumn. In temperate regions, the species may have one or two generations per year, depending on climatic conditions.
Ecological Role
As a herbivore of dock and related plants, G. viridula can influence the vigor and reproductive output of its host species. In agricultural contexts where docks are considered weeds, the beetle may contribute to natural weed control. Conversely, large populations can cause aesthetic damage in ornamental gardens.
Conservation Status
There are no current indications that Gastrophysa viridula faces significant threats across its range. It is not listed on the IUCN Red List, and regional assessments generally categorize it as a species of least concern.
References
- Fauna Europaea (2023): Taxonomic entry for Gastrophysa viridula.
- Joy, N.H. (1932). A Practical Handbook of British Beetles. London: H.F. & G. Witherby.
- Bontems, C. & Petitpierre, E. (2016). “Chrysomelidae of Europe: Species Accounts”. Journal of Insect Biodiversity, 5(2): 123‑138.
