Journal of Ethology

, Volume 29, Issue 2, pp 203–207 | Cite as

Lying on the dorsum: unique host-attacking behaviour of Zatypota albicoxa (Hymenoptera, Ichneumonidae)

  • Keizo TakasukaEmail author
  • Rikio Matsumoto
Video Article


Unique host enticing behaviour has been observed for the first time in Zatypota albicoxa (Walker), which parasitizes the house spider, Parasteatoda tepidariorum (Koch), which weaves irregular, three-dimensional webs. One female wasp lay on her dorsum on the floor and grasped one of the vertical gumfoot threads with her legs (reclining-style). The wasp picked the thread with her legs, feigning a captured and struggling prey. Although this behaviour seems to be a variety of the ambush style, it is quite similar to that of a wandering and captured wingless insect, and it seems an adaptation to the host being hidden in a complex web. As the wasp touched the gumfoot directly, this suggests the possession of behavioural or morphological mechanisms for avoiding entrapment by the sticky masses on the web. Diversity in mode of attack correlates with the fact that the spider constructs webs of various forms in a variety of situations. Digital video images relating to the article are available at,,, and


Gumfoot Imitation Irregular three-dimensional web Oviposition behaviour Parasteatoda tepidariorum Polysphincta-group Reclining 



We would like to express our cordial thanks to Gavin Broad (Natural History Museum, London) for his critical reading of the manuscript. We are also grateful to Hajime Yoshida (Yamagata Prefecture Museum) for providing useful information on references.


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Copyright information

© Japan Ethological Society and Springer 2011

Authors and Affiliations

  1. 1.Entomological Laboratory, Faculty of AgricultureEhime UniversityMatsuyamaJapan
  2. 2.Osaka Museum of Natural HistoryOsakaJapan

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