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New information on the evolution of mating behaviour in Sepsidae (Diptera) and the cost of male copulations in Saltella sphondylii

  • Denise Siew Hoong Tan
  • Sheng Rong Ng
  • Rudolf MeierEmail author
Original Article

Abstract

Here we describe the hitherto unknown details of the highly unusual mating behaviour of Saltella sphondylii—a widely cited model for male longevity costs caused by multiple copulations. When compared to the known mating behaviour of 28 sepsid species, we find five unique behavioural elements based on frame-by-frame analyses of video-recordings. These new behaviours are documented with video clips. We suggest that the male longevity costs could be due to copulation bouts that involve multiple insertions of a comparatively membranous phallus into the female. We compare the phallus of the Saltella sphondylii to those from three other species (Themira putris, Parapaleosepsis plebeia, Sepsis punctum).

Keywords

Sepsidae Mating cost Mating behaviour Longevity Polyandry Sexual conflict 

Notes

Acknowledgements

We would like to thank all members of the Evolutionary Biology Lab, especially Martin Chew for his assistance in generating the molecular phylogeny, and Nalini Puniamoorthy for her helpful comments for the manuscript. This study was financially supported by grant R154-000-476-112 from the Ministry of Education in Singapore.

Supplementary material

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Copyright information

© Gesellschaft für Biologische Systematik 2011

Authors and Affiliations

  • Denise Siew Hoong Tan
    • 1
  • Sheng Rong Ng
    • 1
  • Rudolf Meier
    • 1
    • 2
    Email author
  1. 1.Department of Biological SciencesNational University of SingaporeSingaporeSingapore
  2. 2.University Scholars ProgrammeNational University of SingaporeSingaporeSingapore

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