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Karyology of Acanthocyclops Kiefer, 1927 (Copepoda, Cyclopoida), Including the First Karyological Reports on Acanthocyclops Trajani Mirabdullayev & Defaye, 2002 and A. Einslei Mirabdullayev & Defaye, 2004

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Standard karyotypes of three cyclopoid copepods belonging to the genus Acanthocyclops are reported for freshwater populations from NW Germany and Uzbekistan, namely: A. vernalis (S. Fischer, 1853), A. trajani Mirabdullayev & Defaye, 2002, and Acanthocyclops einslei Mirabdullayev & Defaye, 2004. A comprehensive survey of karyological studies within Acanthocyclops is provided. Species of Acanthocyclops reveal remarkable karyotypic diversity, but also show differences in the mere number of chromosomes, with standard karyotypes ranging from 4 to 12 (2n). Data can provide only limited information on phylogenetic relationships, but are useful diagnostically in clarifying taxonomic boundaries and in separating taxa. Phylogenetic and methodological implications of the karyological findings in Acanthocyclops are discussed. Standardkaryotypen von drei cyclopoiden Copepodenarten der Gattung Acanthocyclops werden von Süsswasserpopulationen NW-Deutschlands und Uzbekistans beschrieben, namentlich von A. vernalis (S. Fischer, 1853), A. trajani Mirabdullayev & Defaye, 2002 und A. einslei Mirabdullayev & Defaye, 2004. Acanthocyclops Arten weisen erhebliche karyologische Diversität auf, zeigen aber auch Unterschiede in der Chromosomenanzahl, mit Karyotypen zwischen 4 und 12 (2n). Die vorhandenen Informationen stellen nur eingeschränkt Informationen zu phylogenetischen Beziehungen zur Verfügung, sind aber brauchbar für die Diagnose und zur Abgrenzung von Taxa. Phylogenetische und methodologische Aspekte der karyologischen Befunde bei Acanthocyclops werden diskutiert.

Affiliations: 1: College of Life Sciences, Zhejiang University, Zi Jin Gang Campus, 388 Yu Hang Tang Road, Hangzhou, Zhejiang 310058, China; 2: Institute of Zoology, Tashkent 700095, Uzbekistan; 3: Institute of Marine Biology, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.; 4: Institute of Marine Biology, National Taiwan Ocean University, Keelung, Taiwan, R.O.C.;, Email:


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