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

Kazunori Yoshizawa, Yoshitaka Kamimura, Charles Lienhard, Rodrigo L. Ferreira, Alexander Blanke

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
JournaleLife
Volume7
DOIs
Publication statusPublished - 2018 Oct 16

Fingerprint

Caves
Insects
Penis
Semen
Canals
Nutrition
Female Genitalia
Anchors
Copulation
Gift Giving
Nutrients
Injections
Capsules
Insemination
Fertilization
Ecosystem
Food

Keywords

  • biomechanics
  • evolution
  • evolutionary biology
  • novelty
  • Psocodea
  • sexual selection

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

Cite this

A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages. / Yoshizawa, Kazunori; Kamimura, Yoshitaka; Lienhard, Charles; Ferreira, Rodrigo L.; Blanke, Alexander.

In: eLife, Vol. 7, 16.10.2018.

Research output: Contribution to journalArticle

Yoshizawa, Kazunori ; Kamimura, Yoshitaka ; Lienhard, Charles ; Ferreira, Rodrigo L. ; Blanke, Alexander. / A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages. In: eLife. 2018 ; Vol. 7.
@article{2a567bc756574bffb492736e9f35616a,
title = "A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages",
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.",
keywords = "biomechanics, evolution, evolutionary biology, novelty, Psocodea, sexual selection",
author = "Kazunori Yoshizawa and Yoshitaka Kamimura and Charles Lienhard and Ferreira, {Rodrigo L.} and Alexander Blanke",
year = "2018",
month = "10",
day = "16",
doi = "10.7554/eLife.39563",
language = "English",
volume = "7",
journal = "eLife",
issn = "2050-084X",
publisher = "eLife Sciences Publications",

}

TY - JOUR

T1 - A biological switching valve evolved in the female of a sex-role reversed cave insect to receive multiple seminal packages

AU - Yoshizawa, Kazunori

AU - Kamimura, Yoshitaka

AU - Lienhard, Charles

AU - Ferreira, Rodrigo L.

AU - Blanke, Alexander

PY - 2018/10/16

Y1 - 2018/10/16

N2 - 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.

AB - 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.

KW - biomechanics

KW - evolution

KW - evolutionary biology

KW - novelty

KW - Psocodea

KW - sexual selection

UR - http://www.scopus.com/inward/record.url?scp=85054888274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054888274&partnerID=8YFLogxK

U2 - 10.7554/eLife.39563

DO - 10.7554/eLife.39563

M3 - Article

VL - 7

JO - eLife

JF - eLife

SN - 2050-084X

ER -