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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
Peer-reviewed Journal Articles, etc >
Female Penis, Male Vagina, and Their Correlated Evolution in a Cave Insect
| Title: | Female Penis, Male Vagina, and Their Correlated Evolution in a Cave Insect |
| Authors: | Yoshizawa, Kazunori Browse this author →KAKEN DB | | Ferreira, Rodrigo L. Browse this author | | Kamimura, Yoshitaka Browse this author | | Lienhard, Charles Browse this author |
| Keywords: | sexual selection | | sexual conflict | | sex-role reversal | | genital evolution |
| Issue Date: | May-2014 |
| Publisher: | Elsevier |
| Journal Title: | Current Biology |
| Volume: | 24 |
| Issue: | 9 |
| Start Page: | 1006 |
| End Page: | 1010 |
| Publisher DOI: | 10.1016/j.cub.2014.03.022 |
| PMID: | 24746797 |
| Abstract: | Sex-specific elaborations are common in animals and have attracted the attention of many biologists, including Darwin [1]. It is accepted that sexual selection promotes the evolution of sex-specific elaborations. Due to the faster replenishment rate of gametes, males generally have higher potential reproductive and optimal mating rates than females. Therefore, sexual selection acts strongly on males [2], leading to the rapid evolution and diversification of male genitalia [3]. Male genitalia are sometimes used as devices for coercive holding of females as a result of sexual conflict over mating [4 and 5]. In contrast, female genitalia are usually simple. Here we report the reversal of intromittent organs in the insect genus Neotrogla (Psocodea: Prionoglarididae) from Brazilian caves. Females have a highly elaborate, penis-like structure, the gynosome, while males lack an intromittent organ. The gynosome has species-specific elaborations, such as numerous spines that fit species-specific pouches in the simple male genital chamber. During prolonged copulation (∼40–70 hr), a large and potentially nutritious ejaculate is transferred from the male via the gynosome. The correlated genital evolution in Neotrogla is probably driven by reversed sexual selection with females competing for seminal gifts. Nothing similar is known among sex-role reversed animals. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/56857 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 吉澤 和徳
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