EFFECT OF Y-ORGAN ABLATION ON OOCYTE GROWTH IN THE TERRESTRIAL ISOPOD,ARMADILLIDIUM VULGARE

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Abstract
The reproductive and molting cycles of the isopod, Armadillidium vulgare, are synchronous during its breeding season. It was found that the rapid growth of oocytes occurs at stage D of the molting cycle. In hibernating females, the oocytes ceased to grow if their Y-organs were surgically extirpated at stage C in early spring. In these animals, many oocytes devoid of follicle cells degenerated along the inner margin of the ovary. Occasionally, however, a mass of granular substance was also seen in that part of the ovary. These results suggest that in A. vulgare the rapid growth of oocytes in stage D females is closely associated with activity of the Y-organ.

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