アメリカシロヒトリの精巣発達と精子形成

概要

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The testicular development and changes of cellular components in the testes of Hyphantria cunea were studied at various stages from the 3rd instar larva to adult. The paired testes of the larva were located dorsally in the 8th segment, but became fused into one at the time of pupation. The testes of the 3rd instar larva were light yellow in color and as the insect aged, large amounts of pigment were deposited in the capsula lobli (an inner testicular membrane) and the testes became brownish black. The testes of the 3rd and 4th instar larva contained essentially proliferating spermatogonia and premeiotic spermatocyte cells. Considerable meiotic activity took place during the 5th instar. Spermatids and eupyrene sperm bundles were first observed in the 6th instar. In the 7th instar, the testes were filled with mature eupyrene sperm bundles and little meiotic activity was present. The testicular elements in the pupal stage consisted primarily of mature eupyrene sperm bundles, and those of apyrene were very few in number. Furthermore, no pronounced difference was observed in spermatogenesis between diapause and non-diapause pupae.
1970-09-25