Behavioral Evidence for Internal Factors Affecting Duration of Conglobation in Pill Bugs (Armadillidium vulgare, Isopoda, Crustacea)

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Pill bugs individually walked an experimental pathway, then were induced to conglobate with a puff of air. After recovering, they were stimulated again. Sixty of 80 pill bugs conglobated both times, first moving either antennae (A) or legs (L) during recovery. Both AA and LL groups showed a significant positive correlation between first (t1) and second (t2) conglobation times. In the AL group, pathway locomotion time (t0) was significantly positively correlated to both t1 and t2. We conclude that pill bugs determine conglobation time based partly on their previous states.


  1. 1.

    Cloudsley-Thompson, J. L. (1977) The Water and Temperature Relations of Woodlice. Meadowfield Press, Durham, England.

    Google Scholar 

  2. 2.

    Moriyama, T. (1999) Decision-making and turn alternation in pill bugs. Intl. J. Comp. Psychol. 12, 153–170.

    Google Scholar 

  3. 3.

    Moriyama, T. (2004) Problem solving and autonomous behavior in pill bugs. Ecol Psychol. 16, 287–302.

    Article  Google Scholar 

  4. 4.

    Smigel, J. T., Gibbs, A. G. (2008) Conglobation in the pill bug, Armadillidium vulgare, as a water conservation mechanism. J. Ins. Sci. 8, 1–9.

    Article  Google Scholar 

  5. 5.

    Yamaguchi, T., Hasegawa, M. (1996) Anti-predation mechanism of soil animals against ants. Edaphol 57, 31–36.

    Google Scholar 

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Correspondence to T. Moriyama.

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Presented during the 12th ISIN Symposium on Invertebrate Neurobiology, August 31–September 4, 2011, Tihany, Hungary.

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Matsuno, H., Moriyama, T. Behavioral Evidence for Internal Factors Affecting Duration of Conglobation in Pill Bugs (Armadillidium vulgare, Isopoda, Crustacea). BIOLOGIA FUTURA 63, 80–82 (2012).

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  • Conglobation
  • internal factor
  • isopod
  • pill bug
  • self-reference