Structure of ovaries in two collembolans, Allacma fusca and Arrhopalites coecus (Hexapoda, Entognatha).
The ovaries of both investigated species are of the polytrophic-meroistic type. They are sac-shaped and not divided into individual ovarioles. Two compartments: the germarium and vitellarium can be discerned within each ovarial sac. The germaria are localized laterally and contain relatively numerous germ cells. In the vitellaria, synchronously developing oocyte-nurse cell complexes occur. In each complex, 3 morphologically, and presumably functionally distinct categories of nurse cells can be distinguished. Follicular cells do not form a continuous follicular epithelium; they are filled with synthetically active organelles and secretory vacuoles. Morphology of the egg envelopes of A. coecus is also described.
Jabłońska
A
A
Institute of Zoology, Jagiellonian University, Kraków, Poland.
Szklarzewicz
T
T
Larink
O
O
Biliński
S
S
D000818:Animals; D001181:Arthropods / Q000033:anatomy & histology*; D005260:Female; D009866:Oogenesis / Q000502:physiology; D010053:Ovary / Q000033:anatomy & histology*; D010063:Ovum / Q000648:ultrastructure