Disposable penis and its replenishment in a simultaneous hermaphrodite

Ayami Sekizawa, Satoko Seki, Masakazu Tokuzato, Sakiko Shiga, Yasuhiro Nakashima

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Although it is often thought that sexual selection is weaker in simultaneous hermaphrodites than in gonochorists, some simultaneous hermaphrodites exhibit bizarre mating behaviour. In the simultaneously hermaphroditic nudibranch Chromodoris reticulata, we found a peculiar mating behaviour, wherein the nudibranch autotomized its penis after each copulation and was able to copulate again within 24 h. To have sufficient length to be replenished for three copulations, the penis is compressed and spiralled internally. No other animal is known to repeatedly copulate using such 'disposable penes'. Entangled sperm masses were observed on the outer surface of the autotomized penis, which is equipped with many backward-pointed spines. There is a possibility that the nudibranch removes sperm already stored in a mating partner's sperm storage organ(s).

Original languageEnglish
Article number20121150
JournalBiology letters
Volume9
Issue number2
DOIs
Publication statusPublished - 2013 Apr 23

Keywords

  • Penis autotomy
  • Simultaneous hermaphrodite
  • Sperm competition

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Agricultural and Biological Sciences(all)

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