Studies on Apyrene and Eupyrene Spermatozoa in the Male Reproductive Organ of the Tetraploid Male of the Silkworm, Bombyx mori L. (Lepidoptera : Bombycidae)

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The behaviour and shape of apyrene sperm bundles or spermatozoa in the male reproductive organ of the tetraploid male ware the same as were observed in those of the diploid male.In the eupyrene sperm bundles, A and B type abnormal bundles were seen mixed with normal bundles in appearance in the testicular follicle of the tetraploid male. The former, in which numerous nucleus-like substances of irregular form were abnormally arranged in a whole part of the elongated bundle, were observed in the entire space of the follicle from the 2nd day of the 5th instar. The latter, a roundish, elliptical and irregular form, were observed above the basement mamberane from the 8th day after pupation as the normal bundles in appearance decrease. Only a few of A type abnormal bundles appeared from the follicle into the vas efferens and migrated in the seminal vesicle.The behaviour and shape of apyrene sperm bundles or spermatozoa and of eupyrene sperm bundles, either normal or abnormal in appearance, in the reproductive organ could not be distinguished between the tetraploid male in the present paper and the triploid male in the report of TAKIZAWA et al. (1976).

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