Life history of Thomisus labefactus Karsch(Araneae: Thomisidae).

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  • アズチグモの生活史
  • アズチグモ ノ セイカツシ

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Abstract

In order to investigate the characteristics of life history of Thomisus labefactus, the nymphs and adults were reared under indoor conditions. The 2nd-instar nymphs that have emerged from egg sacs in September developed to adults in May -June of the following year. Males molted 3-4 times to mature, and females molted 6 times. Out of seven adult females collected from the field, two females produced fertile egg sacs only once, but the others produced sterile eggs or did not oviposit. However, all of eight females reared from the egg stage oviposited fertile eggs and six of them produced 2nd egg sacs. In the latter case, average number of eggs per sac was 171.3 in the 1st egg sac and 16.5 in the 2nd. Total number of eggs produced per female was 183.6 on the average. Average adult longevity was calculated to be 151.4 days in the female and 159.8 days in the male. It is said that, when a male meets a subadult female, he clings to her back and waits her final molt for copulation. According to the results of mating experiment, this was true on subadult females at the stage just before final molt, but males often failed to cling to the back of subadults at the stage just after penultimate molt.

Journal

  • Acta Arachnologica

    Acta Arachnologica 48 (2), 143-149, 1999

    Arachnological Society of Japan

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