Fine Structure of Female and Male Internal Reproductive Organs in a Spider Mite Tetranychina harti(EWING)(Acari:Tetranychidae)

概要

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The structure of the adult female and male internal reproductive organs of Tetranychina harti (EWING) was investigated mainly through electron microscopy. Some oogonia have electron-dense, slender mitochondria, while other oogonia bear electron-sparse, larger mitochondria. The supporting cells surrounding the oocytes include electron-dense mitochondria whilst the oocytes have electron-sparse mitochondria. The spermatozoal nucleus is situated in the central part of the cell within the testis, but in the vas deferens it is located near the periphery. However, in the seminal vesicle, it is in contact with the cell membrane in the posterior. The central electron-sparse part of the spermatozoal nucleus becomes as electron-dense as the other nuclear part before leaving the seminal vesicle. The plasmalemmal tubular structures radially arranged in the testicular spermatozoa become irregularly set in the vas deferens to be divided into shorter structures in the posterior part of the seminal vesicle. Finally, the spermatozoa become almost deficient in cytoplasm proper. The seminal vesicle carries two types of superficial epithelial cells (gate cells) which are located near the exit into the ejaculatory duct and provided with processes. These cellular processes possibly play an important role in the control of discharging the spermatozoa into the ejaculatory duct.
日本応用動物昆虫学会の論文
1992-02-25