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1

Organization of the egg chambers in Hydradephaga (Insecta, Coleoptera-Adephaga) and its phylogenetic significance

100%
Jaglarz M. K., Bilinski S. M.
Folia Biologica
|
1998
|
vol. 46
55-60
EN
The structure of the ovaries in three representatives of Hydradephaga (Haliplus flavicollis, Gyrinus natator and Orectochilus villosus) and one of Geadephaga (Carabus variolosus) was studied. In all the investigated species the ovarioles are of the meroistic polytrophic type. Within ovarioles several egg chambers occur, clearly separated into two compartments: one occupied by nurse cells and the other by an oocyte. The analysis of serial semithin sections revealed that the clusters of the germ cells are branched and that there are always 7 nurse cells in the egg chambers in the examined Hydradephaga. In contrast, the number of nurse cells in Carabus variolosus egg chambers is variable and much greater (around 60). In addition, in the last species a few trophocytes were found containing 2 nuclei. In view of the results obtained the possible phylogenetic implications are discussed. A tentative hypothesis is proposed that a small and constant number of the nurse cells might be a plesiomorphic condition for the suborder Adephaga.
2

Structure of ovaries and oogenesis in dermapterans. II. The nurse cells, nuage aggregates and sponge bodies

100%
Tworzydlo W., Kisiel E.
Folia Biologica
|
2010
|
vol. 58
|
issue 1-2
67-72
EN
In three studied dermapteran species, Doru lineare, Opisthocosmia silvestris and Forficula auricularia, ovarian follicles are composed of two cells only, the oocyte and a single nurse cell. The nuclei of the nurse cells are large, ameboid and contain highly active nucleoli. RER elements, ribosomes, mitochondria and electron-dense aggregations of nuage material are present in the cytoplasm. Immunolocalization analysis revealed that in earwigs the nuage does not contain snRNAs. In one of the studied species, Doru lineare, apart from .canonical. nuage aggregations, characteristic RER/nuage complexes were found. These structures are morphologically similar to the sponge bodies present in the cytoplasm of the Drosophila germline cells. We suggest that RER/nuage complexes in Doru, as sponge bodies in Drosophila, are implicated in mRNA translocation.
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