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Disposable penis and its replenishment in a simultaneous hermaphrodite
Sekizawa, A.; Seki, S.; Tokuzato, M.; Shiga, S.; Nakashima, Y. (2013). Disposable penis and its replenishment in a simultaneous hermaphrodite. Biol. Lett. 9(2): 4 pp. hdl.handle.net/10.1098/rsbl.2012.1150
In: Biology Letters. Royal Society Publishing: London. ISSN 1744-9561, more
Peer reviewed article  

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Keywords
    Chromodoris reticulata; Marine
Author keywords
    Chromodoris reticulata simultaneous hermaphrodite sperm competition penis autotomy

Authors  Top 
  • Sekizawa, A.
  • Seki, S.
  • Tokuzato, M.
  • Shiga, S.
  • Nakashima, Y.

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).

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