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Karyology of Cyclops insignis, Thermocyclops crassus, and Megacyclops viridis (Copepoda, Cyclopoida)

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The aim of the present study is to describe the standard karyotypes of some species of copepods belonging to the Cyclopidae (Copepoda, Cyclopoida) and to compile the information available in the literature for this group. Cyclopoid representatives were investigated from freshwater habitats of northwestern Germany and Russia. Data have thus become available on Cyclops insignis Claus, 1857 (n = 11), Thermocyclops crassus (Fischer, 1853) (n = 7), and Megacyclops viridis (Jurine, 1820) (n = 6). The study reveals substantial karyotype diversity between cyclopoid genera. If literature data are trustworthy, there is remarkable interspecific variability in Thermocyclops and Megacyclops, whereas Cyclops spp. generally show the same chromosome number (2n = 22) with the exception of C. signatus Koch, 1838 (2n = 8). Methodological problems, chromosome variability, and evolutionary implications of karyological investigations are discussed. Standardkaryotypen von cyclopoiden Copepoden des Süsswassers Nordwestdeutschlands und Russlands werden beschrieben und mit Daten aus der Literatur verglichen. Erstmalig werden die Chromosomen von Cyclops insignis Claus, 1857 (n = 11), Thermocyclops crassus (Fischer, 1853) (n = 7), Megacyclops viridis (Jurine, 1820) (n = 6) beschrieben. Die Untersuchung weist auf eine erhebliche karyologische Diversität zwischen den Gattungen der Cyclopidae hin. Wenn die Literaturangaben glaubwürdig sind, gibt es erhebliche interspezifische Unterschiede bei Thermocyclops und Megacyclops, während die Vertreter von Cyclops spp., mit der Ausnahme von C. signatus Koch, 1838 (2n = 8) die gleichen Chromosomenanzahlen von (2n = 22) aufweisen. Methodische Probleme, Chromosomenvariabilität und evolutionäre Aspekte 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: Green Life Science Department, College of Natural Science, Sangmyung University, 7 Hongi-dong, Jongno-gu, Seoul 110-743, Korea; 4: Department of Biology, Faculty of Science, Ramkhamhaeng University, Bangkapi, Bangkok 10240, Thailand; 5: Institute of Marine Biology, National Taiwan Ocean University, Keelung, Taiwan, ROC

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