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Female Penis, Male Vagina, and Their Correlated Evolution in a Cave Insect

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/56857

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)

Submitter: 吉澤 和徳

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