Development of Proctoeces ichiharai (Fellodistomidae, Digenea) in topshell, Batillus cornutus, (Gastropoda).

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  • SHIMURA Shigeru
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo
  • EGUSA Syuzo
    Department of Fisheries, Faculty of Agriculture, The University of Tokyo

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Other Title
  • 二生目吸虫<i>P. ichiharai</i>のサザエ体内における発育
  • 二生目吸虫p.ichiharaiのサザエ体内における発育〔英文〕
  • ニセイモク キュウチュウ p ichiharai ノ サザエ タイナイ ニ オ

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Abstract

The development of Proctoeces ichiharai, from juvenile stage apparently just after infection to mature stage, obtained from the renal coelom of topshell, Batillus cornutus, is described. The general morphology of the developmental stages is illustrated and the data on growth and relative growth of internal organs such as suckers, pharynx, ovary, testes, cirrus pouch, vitelline glands and hindbody aze analyzed. Generally, the organs develop and increase in size with growth, although their relative growth to body length shows brachyauxesis. The variation of ovarian shape, one of the most peculiar characteristics of the present species, is observed even in juvenile specimens. Based on the specimens fixed in hot formalin, mature eggs are observed in the specimens over 3.49mm long, though immature eggs are observed in those over 2.45mm. The size of eggs is distributed equally regardless of body length, ranging from 68 to 74μm in longest diameter. The constancy of mature egg size probably reveals one taxonomic character of the genus Proctoeces. An attempt in obtaining specimens of its cercarial stage by experimental infection and by inspection of mollusks collected in the infected areas was not successful.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 45 (10), 1255-1260, 1979

    The Japanese Society of Fisheries Science

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