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A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages

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Title: A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages
Authors: Yoshizawa, Kazunori Browse this author →KAKEN DB
Kamimura, Yoshitaka Browse this author
Lienhard, Charles Browse this author
Ferreira, Rodrigo L. Browse this author
Blanke, Alexander Browse this author
Issue Date: 16-Oct-2018
Publisher: eLife Sciences Publications
Journal Title: Elife
Volume: 7
Start Page: e39563
Publisher DOI: 10.7554/eLife.39563
Abstract: We report a functional switching valve within the female genitalia of the Brazilian cave insect Neotrogla. The valve complex is composed of two plate-like sclerites, a closure element, and in-and-outflow canals. Females have a penis-like intromittent organ to coercively anchor males and obtain voluminous semen. The semen is packed in a capsule, whose formation is initiated by seminal injection. It is not only used for fertilization but also consumed by the female as nutrition. The valve complex has two slots for insemination so that Neotrogla can continue mating while the first slot is occupied. In conjunction with the female penis, this switching valve is a morphological novelty enabling females to compete for seminal gifts in their nutrient-poor cave habitats through long copulation times and multiple seminal injections. The evolution of this switching valve may have been a prerequisite for the reversal of the intromittent organ in Neotrogla.
Rights: Copyright Yoshizawa et al. This article is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use and redistribution provided that the original author and source are credited.
Type: article
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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