2011 Fiscal Year Final Research Report
Asymmetric male genitalia in calopterygid damselflies : their function and evolutionary patterns
| Project/Area Number |
21570099
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
HAYASHI Fumio 首都大学東京, 理工学研究科, 准教授 (40212154)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 進化 / 精子競争 / 配偶行動 |
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| Research Abstract |
Males of some calopterygid damselfly species(Odonata) have asymmetric genitalia in which the left lateral-process is protruded more than the right process, but those of other species have symmetric genitalia. The function of the lateral-processes is removal of rival sperm from the female spermathecal ducts, which are Y-shaped and placed at the deep part of the female sperm storage organ. On the molecular phylogeny of the family Calopterygidae based on 16S rRNA, asymmetric male genitalia appeared once(all left-handed) and after that the degree of asymmetry changed depending on the female sperm storage tactics.
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