Morphological Change of Genital Organs with Mating in the Sorghum Plant Bug, Stenotus rubrovittatus (Matsumura) (Heteroptera: Miridae)

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  • Sugeno Wataru
    National Agricultural Research Center (NARC), National Agriculture and Food Research Organization (NARO)
  • Watanabe Tomonari
    National Agricultural Research Center (NARC), National Agriculture and Food Research Organization (NARO)

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  • アカスジカスミカメＳｔｅｎｏｔｕｓ　ｒｕｂｒｏｖｉｔｔａｔｕｓ　（Ｍａｔｓｕｍｕｒａ）（カメムシ目：カスミカメムシ科）の交尾による精包の形成および雄性生殖付属腺の形態変化
  • アカスジカスミカメ Stenotus rubrovittatus Matsumura カメムシモク カスミカメムシカ ノ コウビ ニ ヨル セイホウ ノ ケイセイ オヨビ ユウセイ セイショク フゾクセン ノ ケイタイ ヘンカ

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Abstract

Immediately after first mating, the bursa copulatrix of female Stenotus rubrovittatus expanded with a white bulbous spermatophore, which was not observed in unmated females. Sperm was present in the head portion of the spermatophore. The spermatophore was observed in all females immediately after mating and the following day. From 3 to 7 days after mating, the number of females with the spermatophore decreased from 93% to 30%, and most spermatophores shrank to a goblet shape. Sperm in the lateral oviduct was observed in over 96% of females until 7 days after mating. Spermatophores were also present in mated females that were preserved in 70% ethanol for several weeks. In the male genital organs, opaque white parts were present in the accessory glands of unmated males, but were absent immediately after mating. These differences suggest that a secretion from the male accessory gland enters the female bursa copulatrix with the sperm during mating, and the spermatophore is formed temporarily. The mating experience of females can be ascertained by observation of the sperm and/or the spermatophore, which is easy to distinguish in the genital organs.

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