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The studies of Cyclops O.F. Müller, 1776 have more than two centuries of tradition in Fenno-Scandinavia, yet, basic taxonomic questions remain unresolved and the limits of the distributional areaare very poorly understood in the majority of the taxa (11+) occurring in the region. Based on the typesand other materials we redescribe two species, C. lacustris G.O. Sars, 1863 and C. bohater Koźmiński,1933, the latter being reported here for the first time from Fenno-Scandinavia; lectotypes of bothspecies have been designated herein. Setulation characters of the antennal coxobasis- and maxillularypalp setae and P1 medial spine, as well as the spine formula of the terminal exopodal segments of theswimming legs (3433) in the adult female distinguish C. lacustris and C. bohater from their congeners.An identification key is provided to the Cyclops species of Fenno-Scandinavia, including informationabout both the female and male morphology. Although the limited material does not allow us to definethe species range limits, our data nevertheless support a Northern European distribution in C. lacustris,and Northern and Central European distribution in C. bohater, while the records from the southernPalearctic need further verification.Cyclopidae, morphology, zoogeography, freshwater, Europe

european journal of taxonomy

Redescription and taxonomic notes on Cyclops bohater Koźmiński, 1933 and Cyclops lacustris G.O. Sars, 1863 (Arthropoda, Crustacea), with an identification key to the Cyclops species of Fenno-Scandinavia