L: 4-5mmhost-plant: Rumex (Ampfer) and Polygonum (Knterich)Phylum: Arthropoda LATREILLE, 1829 (arthropods, Gliederfer)Subphylum: Hexapoda BLAINVILLE, 1816 (Sechsfer)Class: Insecta LINNAEUS, 1758 (insects, Insekten)Subclass: Pterygota LANG, 1888 (Fluginsekten)Infraclass: Neoptera MARTYNOV, 1923Order: Coleoptera Linnaeus, 1758 (beetles, Kfer)Suborder: Polyphaga EMERY, 1886Infraorder: Cucujiformia LATREILLE, 1802Superfamily: Chrysomeloidea LATREILLE, 1802Family: Chrysomelidae LATREILLE, 1802 (leaf beetles, Blattkfer)Subfamily: Chrysomelinae LATREILLE, 1802 (broad-shouldered leaf beetles)Tribus: Chrysomelini LATREILLE, 1802Genus: Gastrophysa CHEVROLAT in DEJEAN, 1837 (dock beetles) [Syn. Gastroidea]Subgenus: Gastrophysa CHEVROLAT in DEJEAN, 1837 Gastrophysa polygoni LINNAEUS, 1758 (Knterichblattkfer oder Zweifarbiger Blattkfer), [det. Boris Bche, 2012, based on photos]NE-Germay, Brandenburg: vic. Knigs-Wusterhausen, 50m asl., 01.05.2012IMG_0515