JPR Advance Access originally published online on September 8, 2006
Journal of Plankton Research 2006 28(11):1067-1079; doi:10.1093/plankt/fbl041
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A new species in the Daphnia curvirostris (Crustacea: Cladocera) complex from the eastern Palearctic with molecular phylogenetic evidence for the independent origin of neckteeth
1 A. N. Severtsov Institute of Ecology and Evolution, Leninsky Prospect 33, Moscow 119071, Russia and 2 Department of Biological Sciences, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
* Corresponding Author: alexey_kotov{at}sevin.ru
Received February 22, 2006; accepted in principle June 22, 2006; accepted for publication August 31, 2006; published online September 8, 2006
Communicating editor: K.J. Flynn
Little is known of the biology and diversity of the environmental model genus Daphnia beyond the Nearctic and western Palearctic. Here, we describe Daphnia sinevi sp. nov., a species superficially similar to Daphnia curvirostris Eylmann, 1878, from the Far East of Russia. We estimated its phylogenetic position in the subgenus Daphnia s. str. with a rapidly evolving mitochondrial protein coding gene [NADH-2 (ND2)] and a nuclear protein-coding gene [heat shock protein 90 (HSP90)]. Daphnia curvirostris, D. sinevi sp. nov., Daphnia tanakai and D. sp. from Ootori-Ike, Japan, (which, probably, is D. morsei Ishikawa, 1895) formed a monophyletic clade modestly supported by ND2 and strongly supported by HSP90. Our results provide evidence of hidden species diversity in eastern Palearctic Daphnia, independent origins of defensive neckteeth and phylogenetic informativeness of nuclear protein-coding genes for zooplankton genera.