Morphological and genetic polymorphism of new Diacyclops taxonomic group from Lake Baikal (Copepoda: Cyclopoida)

  • Mayor T.Yu. 1
  • Zaidykov I.Yu. 1
  • Kirilchik S.V. 1
  • 1 Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya Str., 3, Irkutsk, 664033, Russia
Keywords: Copepoda, Diacyclops, morphometry, Baikal, COI, ITS


In this study, morphological and molecular analyzes of one phylogenetic group (VIG2) in the complex of Baikal cyclopoids that are similar in morphology to Diacyclops versutus, D. improcerus and D. galbinus are performed. The first internal transcribed spacer (ITS1) and the mitochondrial cytochrome c oxidase subunit I (COI) were chosen as molecular markers. Twenty seven morphological features were measured and values of 18 morphometric characteristics were obtained. An illustrated description of the females VIG2 is given. Representatives of VIG2 are shown to belong to the new taxonomic group Diacyclops in Lake Baikal. Genetic and morphometric differences in the representatives of VIG2 from four locations are comparable to the intraspecific level of differences.