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JPR Advance Access published online on September 8, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbl041
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received February 22, 2006
Accepted August 31, 2006

Article

A new species in the Daphnia curvirostris (Crustacea: Cladocera) complex from the Eastern Palearctic with molecular phylogenetic evidence for the independent origin of neckteeth

Alexey A. Kotov 1 *, Seiji Ishida 2, and Derek J. Taylor 2

1 A. N. Severtsov Institute of Ecology and Evolution, Leninsky Prospect 33, Moscow 119071, Russia
2 Department of Biological Sciences, University at Buffalo, the State University of New York, Buffalo, New York, 14260, USA

* To whom correspondence should be addressed.
Alexey A. Kotov, E-mail: alexey_kotov{at}sevin.ru


  Abstract

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 with D. 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 (ND2), and a nuclear protein-coding gene (HSP90). D. curvirostris, D. sinevi sp. nov., D. 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.

Communicating Editor: KJ Flynn


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