Kamimura, Yoshitaka



Faculty of Business and Commerce (Hiyoshi)


Associate Professor

E-mail Address

E-mail address

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

  • Morphology/Structure (Form/Structure)

  • Ecology/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.

  • 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.

  • A solution to a sex ratio puzzle in Melittobia wasps

    Abe J., Iritani R., Tsuchida K., Kamimura Y., West S.A.

    Proceedings of the National Academy of Sciences of the United States of America (Proceedings of the National Academy of Sciences of the United States of America)  118 ( 20 )  2021.05

    ISSN  00278424

     View Summary

    The puzzling sex ratio behavior of Melittobia wasps has long posed one of the greatest questions in the field of sex allocation. Laboratory experiments have found that, in contrast to the predictions of theory and the behavior of numerous other organisms, Melittobia females do not produce fewer female-biased offspring sex ratios when more females lay eggs on a patch. We solve this puzzle by showing that, in nature, females of Melittobia australica have a sophisticated sex ratio behavior, in which their strategy also depends on whether they have dispersed from the patch where they emerged. When females have not dispersed, they lay eggs with close relatives, which keeps local mate competition high even with multiple females, and therefore, they are selected to produce consistently female-biased sex ratios. Laboratory experimentsmimic these conditions. In contrast, when females disperse, they interact with nonrelatives, and thus adjust their sex ratio depending on the number of females laying eggs. Consequently, females appear to use dispersal status as an indirect cue of relatedness and whether they should adjust their sex ratio in response to the number of females laying eggs on the patch.

  • Long-term coexistence of a hybridization-derived population of Drosophila parapallidosa with closely related Drosophila ananassae (Diptera: Drosophilidae)

    Hama Y., Lee C.Y., Matsuda M., Kamimura Y., Sawamura K.

    Entomological Science (Entomological Science)  23 ( 4 ) 405 - 415 2020.12

    ISSN  13438786

     View Summary

    A 2012–13 survey on Penang Island, Malaysia, revealed the existence of both Drosophila ananassae and Drosophila parapallidosa, the latter of which carries chromosomes Y and 4 from D. ananassae and thus is of hybrid origin. We collected the flies again from the same location in 2018. The hybrid population remained present, which suggests that the D. parapallidosa of hybrid origin does not represent a mere transient population but is stable. Why do these two species coexist irrespective of gene flow? We realized that body size is generally larger in D. ananassae than in D. parapallidosa, which constitutes a new character with which to discriminate these species; previously the number of sex comb teeth was the only diagnostic trait. Character displacement was not detected, however, for those traits. We crossed these two species, which resulted in offspring that had an altered genomic constitution. The body size of D. ananassae was dominant, and the presence of chromosomes Y and 4 did not have a significant effect on body size. By contrast, the presence of chromosome 4 from D. ananassae significantly affected the number of sex comb teeth. Even flies having a genomic constitution similar to that of the Penang D. parapallidosa exhibited a number of sex comb teeth that was intermediate between the two species. We propose that the D. parapallidosa sex comb character underwent selection during evolution of the Penang Island population. Reproductive interference between the species, presumably caused by signal jamming, was detected.

  • A standardized nomenclature and atlas of the male terminalia of Drosophila melanogaster

    Rice G., David J.R., Kamimura Y., Masly J.P., Mcgregor A.P., Nagy O., Noselli S., Nunes M.D.S., O’Grady P., Sánchez-Herrero E., Siegal M.L., Toda M.J., Rebeiz M., Courtier-Orgogozo V., Yassin A.

    Fly (Fly)  13 ( 1-4 ) 51 - 64 2019.10

    ISSN  19336934

     View Summary

    Animal terminalia represent some of the most diverse and rapidly evolving structures in the animal kingdom, and for this reason have been a mainstay in the taxonomic description of species. The terminalia of Drosophila melanogaster, with its wide range of experimental tools, have recently become the focus of increased interest in the fields of development, evolution, and behavior. However, studies from different disciplines have often used discrepant terminologies for the same anatomical structures. Consequently, the terminology of genital parts has become a barrier to integrating results from different fields, rendering it difficult to determine what parts are being referenced. We formed a consortium of researchers studying the genitalia of D. melanogaster to help establish a set of naming conventions. Here, we present a detailed visual anatomy of male genital parts, including a list of synonymous terms, and suggest practices to avoid confusion when referring to anatomical parts in future studies. The goal of this effort is to facilitate interdisciplinary communication and help newcomers orient themselves within the exciting field of Drosophila genitalia.

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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

    Introduction and explanation (commerce magazine), 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

  • 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

  • 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

  • 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

  • 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.」

    Country: 日本

  • 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

    Country: 日本


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