STRUCTURE OF OVARIES IN 2 COLLEMBOLANS, ALLACMA-FUSCA AND ARRHOPALITES-COECUS (HEXAPODA, ENTOGNATHA)

The ovaries of both investigated species are of the polytrophic-merois tic type. They are sac-shaped and not divided into individual ovariole s. Two compartments: the germarium and vitellarium can be discerned wi thin each ovarial sac. The germaria are localized laterally and contai n relatively numerous germ cells. In the vitellaria, synchronously dev eloping oocyte-nurse cell complexes occur. In each complex, 3 morpholo gically, and presumably functionally distinct categories of nurse cell s can be distinguished. Follicular cells do not form a continuous foll icular epithelium; they are filled with synthetically active organelle s and secretory vacuoles. Morphology of the egg envelopes of A. coecus is also described.