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Gastrophysa viridula Scientific classification Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Coleoptera Family: Chrysomelidae Subfamily: Chrysomelinae Genus: Gastrophysa Species: G. viridula Binomial name Gastrophysa viridula (De Geer, 1775) Synonyms Gastroidea viridula (De Geer, 1775)[1] Gastrophysa viridula, known as the green dock beetle, green dock leaf beetle or green sorrel beetle, is a species of beetle native to Europe. Contents 1 Description 1.1 Subspecies 2 Distribution and habitat 3 Diet 4 Life cycle 5 References 6 External links Description The length of the green dock beetle varies between sexes, with the males being 4 mm and the females being 7 mm. During the mating season, females have enlarged abdomens. Both sexes are green with a metallic shimmer, which, depending on the light, can be gold green, blue, purple, violet, or red. The legs of this species also shimmer a metallic green, and are strongly built. The antennae are serrated and are medium in length.[1] Subspecies Gastrophysa viridula pennina (Weise, 1882) Gastrophysa viridula viridula (De Geer, 1775) Distribution and habitat mating couple The green dock beetle is commonly found in central Europe. Its range extends eastward into western Siberia and the Caucasus Mountains. They are found in heathlands, forests, meadows, and gardens with the presence of plant dock (Rumex), the beetles' food plant.[1] Diet The green dock beetle feeds mainly on dock and green sorrel, rarely feeding on other plants in the families Polygonaceae, Brassicaceae, Violaceae, and Boraginaceae. The larvae can only completely develop on Rumex species.[1] Life cycle larvae The green dock beetle's breeding season is from March to October. There are 2 to 4 broods per year, with the last brood hibernating as an adult. The female lays over 1,000 eggs, laying them in clusters of 20 to 45 on the underside of the food plant's leaves. The eggs are oval in shape, and are cream to yellow, turning orange prior to hatching. After about 3 to 6 days, the larva hatches from the egg. It varies in color from greenish gray to dark brown. Its body is segmented, and will reach a length of 8 mm. Young larvae will drop to the ground if disturbed while feeding, while older larvae secrete a substance which repels competitors from eating the food plant leaves. After three instars, the larva pupates in a burrow about 2 cm underground. The adult emerges 6 to 9 days later.[1] References ^ a b c d e Pepwork GmbH. "Green Dock Beetle — Gastrophysa viridula". Insectoid.Info. http://www.insectoid.info/beetles/leaf-beetle/green-dock-beetle/. Retrieved 15 October 2010.  External links Media related to Gastrophysa viridula at Wikimedia Commons