Structure of ovaries and oogenesis in dermapterans. I. Origin and functioning of the ovarian follicles.

@article{Tworzydlo2008StructureOO,
  title={Structure of ovaries and oogenesis in dermapterans. I. Origin and functioning of the ovarian follicles.},
  author={Waclaw Tworzydlo and Szczepan M Bilinski},
  journal={Arthropod structure \& development},
  year={2008},
  volume={37 4},
  pages={
          310-20
        }
}
The ovaries of the studied earwig species (Forficula auricularia, Chelidurella acanthopygia, Doru lineare and Opisthocosmia silvestris) are meroistic-polytrophic and composed of numerous short ovarioles that consist of a terminal filament, germarium and vitellarium. The germaria of adult females comprise meiotic (pachytene) and postmeiotic (differentiating) germ cell clusters, as well as small prefollicular cells. All germ cell clusters consist of two cells that are connected by a single… Expand
Ovaries and germline cysts and their evolution in Dermaptera (Insecta).
TLDR
Histological analysis suggests that the origin of the oocyte and nurse cell units in this species follows the pattern described in eudermapterans, and the interpretation of the results in an evolutionary context supports the monophyly of the Dermaptera and Euderm adaptera and the inclusion of the Arixeniina and Hemimerina in the latter taxon. Expand
Structure of ovaries and oogenesis in dermapterans. II. The nurse cells, nuage aggregates and sponge bodies.
TLDR
It is suggested that RER/nuage complexes in Doru, as sponge bodies in Drosophila, are implicated in mRNA translocation. Expand
A Very Simple Mode of Follicular Cell Diversification in Euborellia fulviceps (Dermaptera, Anisolabididae) Involves Actively Migrating Cells
TLDR
It is found that FCs from the latter subpopulation send long and thin filopodium-like and microtubule-rich processes penetrating between the oocyte and nurse cell membranes, which suggests that, in E. fulviceps, cells from at least one FCs subpopulation show the ability to change position within an ovarian follicle by means of active migration. Expand
Ovarian nests in cultured females of the Siberian sturgeon Acipenser baerii (Chondrostei, Acipenseriformes)
Ovaries of Acipenser baerii are of an alimentary type and probably are meroistic. They contain ovarian nests, individual follicles, inner germinal ovarian epithelium, and fat tissue. Nests compriseExpand
Germline cysts and asymmetry in early previtellogenic ovarian follicles in cultured albino females of sterlet Acipenser ruthenus L. 1758 (Chondrostei, Acipenseriformes)
TLDR
The structure of germline cells in ovaries of albino sterlet Acipenser ruthenus L. 1758 has been examined in gynogenetic and control specimens of this species and the asymmetry of the early previtellogenic oocyte cytoplasm is described. Expand
Reproduction, Gonad Structure, and Oogenesis in Tardigrades.
TLDR
Several features related to the oogenesis and structure of the ovary confirm the hypothesis that tardigrades are the sister group rather for arthropods than for onychophorans. Expand
The Balbiani Body in the Female Germline Cells of an Earwig, Opisthocosmia silvestris
TLDR
In forficuloid earwigs, female germ cell cysts are composed of two cells only: the pro-oocte and pro-nurse cells, and it is shown that in Opisthocosmia silvestris, the Cystoblast, as well as both cells of the cyst, contain the Balbiani body, a distinct cytoplasmic organelle composed of numerous mitochondria. Expand
The female reproductive system and oogenesis in Thulinius ruffoi (Tardigrada, Eutardigrada, Isohypsibiidae).
TLDR
The female reproductive system organization and oogenesis in the eutardigrade Thulinius ruffoi is described and the cortical reaction in tardigrades is described, possibly for the first time. Expand
Ovaries and oogenesis in an epizoic dermapteran, Hemimerus talpoides (Dermaptera, Hemimeridae): Structural and functional adaptations to viviparity and matrotrophy.
TLDR
The ovaries as well as the oocytes of H. talpoides are characterized by an exceptional mixture of features shared with derived dermapterans and adaptations to matrotrophy, strongly reinforcing the idea that the Hemimerina should be classified within the Eudermaptera. Expand
Differentiation of follicular cells in polytrophic ovaries of Neuroptera (Insecta: Holometabola).
TLDR
Almost complete immobility of follicular cells in neuropteran egg chambers results in a lower number of diversified subpopulations when compared to Drosophila and other true flies. Expand
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