Kamimura, Yoshitaka



Faculty of Business and Commerce (Hiyoshi)


Associate Professor

External Links

Career 【 Display / hide

  • 2003.04

    立正大学 地球環境科学部 助手

  • 2005.04

    北海道大学大学院 農学研究科 助手

  • 2006.04

    北海道大学大学院 農学研究院 助手

  • 2007.04

    北海道大学大学院 農学研究院 助教

  • 2012.03

    Visiting Assistant Professor, Universiti Sains Malaysia (Malaysia)

Academic Background 【 Display / hide

  • 2001.03

    Tokyo Metropolitan University, Graduate School of Science, Department of Biology

    Graduate School, Completed, Master's course

  • 2003.03

    Tokyo Metropolitan University, Graduate School of Science, Department of Biology

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(理学), Tokyo Metropolitan University, Dissertation, 2004.03


Research Areas 【 Display / hide

  • Life Science / Morphology and anatomical structure (Form/Structure)

  • Life Science / Ecology and environment

Research Themes 【 Display / hide

  • Evolutionary biology, morphology, and reproductive ecology of insects, 



Books 【 Display / hide

  • 昆虫の交尾は、味わい深い…。

    Kamimura Yoshitaka, 岩波書店, 2017.08

  • Cryptic Female Choice in Arthropods - Patterns, Mechanisms and Prospects.

    Kamimura Y., Springer, 2015

    Scope: What is indirect cryptic female choice? Theoretical considerations and an example from a promiscuous earwig.

  • 日本産幼虫図鑑

    Kamimura Yoshitaka, 学研, 2005.10

    Scope: 336

Papers 【 Display / hide

  • An innovative ovipositor for niche exploitation impacts genital coevolution between sexes in a fruit-damaging drosophila

    Muto, L., Kamimura, Y., Tanaka, K. M., Takahashi, A.

    Proceedings of the Royal Society B (Proceedings of the Royal Society B: Biological Sciences)  285 ( 1887 ) 20181635 2018

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  09628452

     View Summary

    © 2018 The Author(s). Limited attention has been given to ecological factors influencing the coevolution of male and female genitalia. The innovative ovipositor of Drosophila suzukii, an invading fruit pest, represents an appealing case to document this phenomenon. The serrated saw-like ovipositor is used to pierce the hard skin of ripening fruits that are not used by other fruit flies that prefer soft decaying fruits. Here, we highlight another function of the ovipositor related to its involvement in genital coupling during copulation. We compared the morphology and coupling of male and female genitalia in this species to its sibling species, Drosophila subpulchrella, and to an outgroup species, Drosophila biarmipes. These comparisons and a surgical manipulation indicated that the shape of male genitalia in D. suzukii has had to be adjusted to ensure tight coupling, despite having to abandon the use of a hook-like structure, paramere, because of the more linearly elongated ovipositor. This phenomenon demonstrates that ecological niche exploitation can directly affect the mechanics of genital coupling and potentially cause incompatibility among divergent forms. This model case provides new insights towards elucidating the importance of the dual functions of ovipositors in other insect species that potentially induce genital coevolution and ecological speciation.

  • A new species of Diplatys (Insecta, Dermaptera, Diplatyidae) earwig from the Western Ghats of India

    Karthik C.M., Kamimura Y., Kalleshwaraswamy C.M.

    ZooKeys (ZooKeys)  2022 ( 1088 ) 53 - 64 2022

    ISSN  13132989

     View Summary

    To explore diversity of earwigs (Dermaptera) in different agricultural ecosystems of South India, an extensive taxonomic survey was conducted in 2020 during which an undescribed species of Diplatys was collected. Twenty-one species of the genus Diplatys (Diplatyidae, Diplatyinae) have been reported to date from India, of which six species are known from Karnataka, South India. Based on a male specimen collected from a sugarcane field in Karnataka, a new species, Diplatys sahyadriensis sp. nov., is described as the twenty-second species of this genus from India. A revised key to the males of Diplatys species from India and Sri Lanka is provided. This new record adds to the known species diversity in the Sahyadri Ranges of the Western Ghats in Shivamogga District, Karnataka, part of the Southern Plateau and Hills agro-climatic region of India.

  • Penetration mechanics of elongated female and male genitalia of earwigs

    Matsumura Y., Kamimura Y., Lee C.Y., Gorb S.N., Rajabi H.

    Scientific Reports (Scientific Reports)  11 ( 1 )  2021.12

     View Summary

    We unveiled the penile penetration mechanics of two earwig species, Echinosoma horridum, whose intromittent organ, termed virga, is extraordinarily long, and E. denticulatum, whose virga is conversely short. We characterised configuration, geometry, material and bending stiffness for both virga and spermatheca. The short virga of E. denticulatum has a material gradient with the stiffer base, whereas the long virga of E. horridum and the spermathecae of both species are homogeneously sclerotised. The long virga of E. horridum has a lower bending stiffness than the spermatheca. The virga of E. denticulatum is overall less flexible than the spermatheca. We compared our results to a previous study on the penetration mechanics of elongated beetle genitalia. Based on the comparison, we hypothesised that the lower stiffness of the male intromittent organ comparing to the corresponding female structure is a universal prerequisite for the penetration mechanics of the elongated intromittent organ in insects.

  • Evolution of nuptial gifts and its coevolutionary dynamics with male-like persistence traits of females for multiple mating

    Kamimura Y., Yoshizawa K., Lienhard C., Ferreira R.L., Abe J.

    BMC Ecology and Evolution (BMC Ecology and Evolution)  21 ( 1 )  2021.12

     View Summary

    Background: Many male animals donate nutritive materials during courtship or mating to their female mates. Donation of large-sized gifts, though costly to prepare, can result in increased sperm transfer during mating and delayed remating of the females, resulting in higher paternity. Nuptial gifting sometimes causes severe female-female competition for obtaining gifts (i.e., sex-role reversal in mate competition) and selection on females to increase their mating rate, changing the intensity of sperm competition and the resultant paternity gains. We built a theoretical model to simulate such coevolutionary feedbacks between nuptial gift size (male trait) and propensity for multiple mating (female trait). Donation of nuptial gifts sometimes causes development of female persistence trait for gift acquisition. We also analyzed the causes and consequences of this type of traits, taking double receptacles for nutritious seminal gifts, which are known to occur in an insect group with a “female penis” (Neotrogla spp.), as an illustrative example. Results: Our individual-based simulations demonstrated that female-female competition for male-derived nutrients always occur when the environment is oligotrophic and mating costs are low for females. However, a positive correlation between donated gift size and the resultant paternity gain was a requisite for the co-occurrence of large gifts and females’ competitive multiple mating for the gifts. When gift donation satisfied female demands and thus resulted in monandry, exaggeration of nuptial gift size also occurred under the assumption that the last male monopolizes paternity. The evolution of double slots for gift acquisition and digestion (female persistence trait) always occurred when males could not satisfy the demands of females for gifts. However, through coevolutionary reduction in male gift size, fixation of this trait in a population drastically reduced the average female fitness. Conclusion: Sperm usage patterns, which have rarely been examined for animals with nuptial gifts, can be a critical factor for determining the extent of exaggeration in nuptial gifting. Sex-role reversals in mate competition, as a result of donation of nuptial gifts from males to females, can involve the evolution of male-like, persistent traits in females that reduce population productivity, as is the case with persistence traits in males.

  • Random or handedness? Use of laterally paired penises in Nala earwigs (Insecta: Dermaptera: Labiduridae)

    Kamimura Y., Matsumura Y., Yang C.C.S., Gorb S.N.

    Biological Journal of the Linnean Society (Biological Journal of the Linnean Society)  134 ( 3 ) 716 - 731 2021.11

    ISSN  00244066

     View Summary

    Animals can show bias in their use of laterally paired organs that do not have any conspicuous anatomical differentiation between the right and left organs. Like right handedness in humans, males of the giant earwig Labidura riparia (Labiduridae: Labidurinae) preferentially (~90%) use the right one of their laterally paired penises for copulation. To elucidate the evolutionary origin of this lateralization, patterns of penis use were examined for the related species of the genus Nala (Labiduridae: Nalinae). In multiple populations and broods of both Nala lividipes and Nala nepalensis, males that were ready to use the right or left penis were equally frequent, providing a striking contrast to Labidura. Surgical ablation of one of the two penises revealed that both penises are functionally competent in N. lividipes. Nevertheless, each male almost consistently used only one of the paired penises, either the right or the left one. Changes in penis use were estimated to occur only once per 64-143 days per male. The present study is the first report of individual-level lateralization for animal genitalia that do not show any conspicuous anatomical differentiation between the right and left organs. Possible advantages of lateralization are discussed in relationship to co-evolution of the genitalia between the sexes.

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Papers, etc., Registered in KOARA 【 Display / hide

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Reviews, Commentaries, etc. 【 Display / hide

  • 動物の性をめぐる進化、あれこれ


    理科教室 61 ( 5 ) 40 - 45 2018

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Joint Work

Research Projects of Competitive Funds, etc. 【 Display / hide

  • 昆虫の交尾器進化における雌の繁殖戦略の役割-ハサミムシ目を中心に-


    Grant-in-Aid for Scientific Research, Research grant, No Setting

  • 精子競争関連形質の量的遺伝学~交尾器進化のパラドックス解決に向けて~


    Grant-in-Aid for Scientific Research, Research grant, No Setting

  • 昆虫の母性行動を利用した有害菌特異的抗菌物質の探索


    ノーステック財団基盤的研究開発育成 若手研究, Research grant, No Setting

  • 器官の「数」はいかに進化するのか?~昆虫の生殖器・交尾器を材料に~


    Grant-in-Aid for Scientific Research, Research grant, No Setting

  • 昆虫類のメス交尾器に“隠された”多様性~観察技術の確立と応用~


    Grant-in-Aid for Scientific Research, Research grant, Principal investigator

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Awards 【 Display / hide

  • 2012年度日本昆虫学会学会賞

    上村佳孝・三本博之, 2012.09, 日本昆虫学会, 受賞論文「Kamimura, Y., Mitsumoto, H.(2011) Comparative copulation anatomy of the Drosophila melanogaster species complex (Diptera: Drosophilidae). Entomological Science 14: 399-410.」

  • 2012年度日本昆虫学会若手奨励賞

    上村佳孝, 2012.09, 日本昆虫学会, 昆虫の交尾器の進化・多様化機構に関する多面的研究


Courses Taught 【 Display / hide











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Memberships in Academic Societies 【 Display / hide

  • 日本昆虫学会, 


Committee Experiences 【 Display / hide

  • 2016.01

    編集専門委員(Associate Editor), 日本昆虫学会

  • 2010.01

    編集諮問委員, 日本昆虫学会

  • 2008.01

    編集幹事, 日本昆虫学会