Possible removal of rival sperm by the elongated genitalia of the earwig, Euborellia plebeja

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Sperm displacement is a sperm competition avoidance mechanism that reduces the paternity of males that have already mated with the female. Direct anatomical sperm removal or sperm flushing is known to occur in four insect orders: Odonata, Orthoptera, Coleoptera and Hymenoptera. In a fifth order, Dermaptera (earwigs), I found that the virga (the elongated rod of the male genitalia) of Euborellia plebeja seems to be used to remove rival sperm from the spermatheca (a fine-tubed female sperm storage organ). In this species, copulation lasted on average 4.6 minutes, during which time the male inserted the virga deep into the spermatheca, and then extracted it ejaculating semen from the opening of the virgal tip. The extraction of virgae (with its brim-like tip) appeared to cause removal of stored sperm in the spermatheca. The virga was as long as the body length of males, and the spermatheca was twice the female body length. The long length of the spermatheca and the possible removal function of the virga may select for virgal elongation.

Original languageEnglish
Pages (from-to)667-672
Number of pages6
JournalZoological Science
Volume17
Issue number5
Publication statusPublished - 2000 Jul
Externally publishedYes

Fingerprint

Euborellia
spermatheca
genitalia
spermatozoa
Dermaptera
body length
storage organs
sperm competition
Odonata
male genitalia
paternity
Orthoptera
copulation
semen
Hymenoptera
Coleoptera
insects

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Possible removal of rival sperm by the elongated genitalia of the earwig, Euborellia plebeja. / Kamimura, Yoshitaka.

In: Zoological Science, Vol. 17, No. 5, 07.2000, p. 667-672.

Research output: Contribution to journalArticle

@article{ec9d97835659496593eee2750f290612,
title = "Possible removal of rival sperm by the elongated genitalia of the earwig, Euborellia plebeja",
abstract = "Sperm displacement is a sperm competition avoidance mechanism that reduces the paternity of males that have already mated with the female. Direct anatomical sperm removal or sperm flushing is known to occur in four insect orders: Odonata, Orthoptera, Coleoptera and Hymenoptera. In a fifth order, Dermaptera (earwigs), I found that the virga (the elongated rod of the male genitalia) of Euborellia plebeja seems to be used to remove rival sperm from the spermatheca (a fine-tubed female sperm storage organ). In this species, copulation lasted on average 4.6 minutes, during which time the male inserted the virga deep into the spermatheca, and then extracted it ejaculating semen from the opening of the virgal tip. The extraction of virgae (with its brim-like tip) appeared to cause removal of stored sperm in the spermatheca. The virga was as long as the body length of males, and the spermatheca was twice the female body length. The long length of the spermatheca and the possible removal function of the virga may select for virgal elongation.",
author = "Yoshitaka Kamimura",
year = "2000",
month = "7",
language = "English",
volume = "17",
pages = "667--672",
journal = "Zoological Science",
issn = "0289-0003",
publisher = "Zoological Society of Japan",
number = "5",

}

TY - JOUR

T1 - Possible removal of rival sperm by the elongated genitalia of the earwig, Euborellia plebeja

AU - Kamimura, Yoshitaka

PY - 2000/7

Y1 - 2000/7

N2 - Sperm displacement is a sperm competition avoidance mechanism that reduces the paternity of males that have already mated with the female. Direct anatomical sperm removal or sperm flushing is known to occur in four insect orders: Odonata, Orthoptera, Coleoptera and Hymenoptera. In a fifth order, Dermaptera (earwigs), I found that the virga (the elongated rod of the male genitalia) of Euborellia plebeja seems to be used to remove rival sperm from the spermatheca (a fine-tubed female sperm storage organ). In this species, copulation lasted on average 4.6 minutes, during which time the male inserted the virga deep into the spermatheca, and then extracted it ejaculating semen from the opening of the virgal tip. The extraction of virgae (with its brim-like tip) appeared to cause removal of stored sperm in the spermatheca. The virga was as long as the body length of males, and the spermatheca was twice the female body length. The long length of the spermatheca and the possible removal function of the virga may select for virgal elongation.

AB - Sperm displacement is a sperm competition avoidance mechanism that reduces the paternity of males that have already mated with the female. Direct anatomical sperm removal or sperm flushing is known to occur in four insect orders: Odonata, Orthoptera, Coleoptera and Hymenoptera. In a fifth order, Dermaptera (earwigs), I found that the virga (the elongated rod of the male genitalia) of Euborellia plebeja seems to be used to remove rival sperm from the spermatheca (a fine-tubed female sperm storage organ). In this species, copulation lasted on average 4.6 minutes, during which time the male inserted the virga deep into the spermatheca, and then extracted it ejaculating semen from the opening of the virgal tip. The extraction of virgae (with its brim-like tip) appeared to cause removal of stored sperm in the spermatheca. The virga was as long as the body length of males, and the spermatheca was twice the female body length. The long length of the spermatheca and the possible removal function of the virga may select for virgal elongation.

UR - http://www.scopus.com/inward/record.url?scp=0034336903&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034336903&partnerID=8YFLogxK

M3 - Article

VL - 17

SP - 667

EP - 672

JO - Zoological Science

JF - Zoological Science

SN - 0289-0003

IS - 5

ER -