title: Redescription of Acanthocyclops vernalis (Fischer, 1853) and Acanthocyclops robustus (Sars, 1863) from neotypes, with special reference to their distinction from Acanthocyclops americanus (Marsh, 1892) and its invasion of Eurasia
abstract: This paper provides a redescription of Acanthocyclops vernalis and A. robustus neotypes collected in their type localities in Russia (Orlov pond, Peterhof) and Norway (a stream outcoming from a lake in Oslo) with a special attention to their morphological differentiation from A. americanus. Due to overmixing of these species throughout most of the last century and fast arrival and spreading of the aggressive planktonic predator A. americanus, all previous indications of A. robustus should be che
journal: Limnetica