| Summary: | Ten of the 27 species of Plateumaris Thomson (Chrysomelidae: Donaciinae) occur in the Palaearctic. Due to the intraspecific variation and the large distributions of some species, descriptions exist for at least 80 taxa plus five nomina nuda. The status of each valid species is clarified and the remaining 70 names are allocated as synonyms. New synonymies are P. tenuicornis Balthasar, considered a synonym of P. consimilis (Schrank), P. sulcifrons Weise as a synonym of P. rustica (Kunze), and P. caucasica Zaitzev as a synonym of P. sericea (Linnaeus). Two controversial synonyms are confirmed: P. discolor (Panzer) and P. sericea sibirica (Solsky) are both synonyms of P. sericea. Finally, P. obsoleta Jacobson is a synonym but at present it is not possible to decide whether it belongs to P. shirahatai Kimoto or to P. sericea. Forty-one new country records are added, compared with the Catalogue of Palaearctic Coleoptera published in 2010; 28 records are based on recently published records and 13 are first records for a specific country.
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