SEXUAL DIMORPHISM OF PALAEMON PACIFICUS(STIMPSON) AND P. SERRIFER(STIMPSON)

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  • ITO Madoka
    Department of Aquatic Bioscience, Tokyo University of Fisheries
  • WATANABE Seiichi
    Department of Aquatic Bioscience, Tokyo University of Fisheries

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Other Title
  • イソスジエビとスジエビモドキにみられる性的2型について
  • イソスジエビ ト スジエビモドキ ニ ミラレル セイテキ 2ガタ ニ ツイテ

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Sexual dimorphism of Palaemon pacificus and P. serrifer were investigated during 1987 to 1989 in Tateyama Bay, Chiba Prefecture. It was found that both the rostral length and the number of segments of the inner branch of the bifurcated outer flagellum were larger in males than in females. The difference between male and female appeared nearly the size of the minimual ovigerous female. Difference between male and female on both the rostrum and the inner branch of the bifurcated outer flagellum appeared with maturing.

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