A new divergent lineage of Daphnia (Cladocera: Anomopoda) and its morphological and genetical differentiation from Daphnia curvirostris Eylmann, 1887

Authors: ISHIDA, S.¹; KOTOV, A. A.²; TAYLOR, D. J.¹

Source: Zoological Journal of the Linnean Society, Volume 146, Number 3, March 2006 , pp. 385-405(21)

Publisher: Wiley-Blackwell

Abstract:

The systematic biology of the subgenus Daphnia s.s. remains confused. Prior attempts at resolution used chiefly postabdominal claw morphology, chromosome numbers and rRNA gene sequences as characters for higher-level relations. Still, several taxa, such as Daphnia curvirostris Eylmann, 1878, have unclear affiliations. We addressed the position of D. curvirostris in this genus by estimating phylogenetic trees from a rapidly evolving protein coding gene (ND2), conducting broad geographical comparisons and carrying out detailed morphological comparisons. The Japanese `curvirostris' was found to be a new divergent lineage in the subgenus Daphnia, and to possess distinctive morphological characteristics from D. curvirostris. We described this new species as Daphnia tanakai sp. nov., and redescribed D. curvirostris. The polymorphic postabdominal claw morphology and the distinctive chromosome number of D. tanakai sp. nov. provided evidence for rapid evolution of these traits. Our new morphological, chromosomal and genetic assessment of Daphnia weakened the argument for division of the subgenus Daphnia (Daphnia) O. F. Müller, 1785 sensu Johnson, 1952, into two further subgenera. © 2006 The Linnean Society of London, Zoological Journal of the Linnean Society, 2006, 146, 385–405.

Keywords: chromosome; Daphnidae; mitochondrial DNA; morphology; phylogeny; postabdominal claw; subgenera; taxonomy

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1096-3642.2006.00214.x

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

Publication date: 2006-03-01

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