モザイク状の生殖巣をもつマイマイガの1幼虫

概要

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A larva of a gypsy moth, Lymantria dispar L. belonging to the Gifu-race, was found to have a mosaic gonad. This paper deals with the morphological study of this gonad at the 5th instar stage. The larva at hand is externally of male character. Its right testis is normal either in structure and in size, while the left one is abnormal : it is medium-sized consisting of two chambers and remarkable by the presence of an additional small bisexual gonad. The bisexual gonad has a stalk-like structure in its extremity having no septum. There are both male and female germ cells in this gonad ; female cells exist in six groups (I-VI) and are surrounded by spermatids in the posterior regions of this gonad. They give an appearance of nurse cells when compared with those of the normal ones, and remarkable by the absence of follicle cells. From the fact that the number and morphology of the chromosomes found in this gonad are normal showing 2n=62 and n=31, it is apparent that this larva is of diploid constitution.
社団法人日本動物学会の論文
1957-04-15