Abstract
Diaphanosoma kizakiensis sp. nov. is described from material from Lake Kizaki (Honshu, Japan). It can be regarded as a member of the D. brachyurum species group, and is characterized by some specific but not readily visible features, such as the presence of a relatively small head, a small and sharp (not large and lanceolate) spine on the outer side of the distal end of the antennal basipodite, and particular features of the armament of the posteroventral valve margins. This species along with some other recently investigated Japanese cladocerans form a group of taxa which highlight that this country is one of the regional centers of cladoceran endemicity in Eastern Asia.
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Abbreviations
- AnL:
-
Length of swimming antennae
- BaL:
-
Length of antennal basipodite
- BL:
-
Body length
- DE:
-
Diameter of eye
- en:
-
Endopodite
- ep:
-
Epipodite
- ex:
-
Exopodite
- HH:
-
Head height
- HL:
-
Head length
- I:
-
Large, two-segmented, setulated seta on distal corner of gnathobases of tl I–tl V
- J:
-
Modified thorn-like, naked, hooked seta on distal corner of gnathobases of tl III–tl V
- n :
-
Number of filtering setae of endopodite and gnathobase of thoracic limbs
- p:
-
Nonsetulated setae on proximal corner of gnathobases of tl II–tl V
- tl I–tl VI:
-
First–sixth pairs of thoracic limbs
- UAn:
-
Length of upper antennal branch
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Acknowledgments
The author is much indebted to Dr. S. Tanaka (Toyama, Japan) for loaning a sample from Lake Kizaki for investigation, and to Prof. N.N. Smirnov (Institute of Ecology and Evolution Moscow, Russia) for linguistic correction of the text. The manuscript was also improved by the editor’s corrections, made by Dr. Keiichi Kawabata, and one anonymous reviewer. This study was supported by a grant from the Russian Foundation for Basic Research (no. 09-04-00201a).
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Handling Editor: Keiichi Kawabata.
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Korovchinsky, N.M. A new species of the genus Diaphanosoma Fischer, 1850 (Crustacea: Cladocera: Sididae) from Japan. Limnology 14, 13–18 (2013). https://doi.org/10.1007/s10201-012-0377-5
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DOI: https://doi.org/10.1007/s10201-012-0377-5