Males of the cockroach, Blattella germanica, possess ovary-like structures with a few small oocytes as a constant feature. The rudimentary ovaries are located, just as female ovaries, in the 4th and 5th abdominal segments. The embryonic development of these organs is reviewed. Symbiotic microorganisms, which are transmitted only ovarially by the female parent, have been found in well-developed male oocytes. It is postulated that the mesoderm of the 4th-5th abdominal segments induces the genetic male egg cells to form yolk, and that the symbiotes are then attracted to the yolk-cytoplasmic substrate.
|Original language||English (US)|
|Number of pages||11|
|Journal||International Journal of Insect Morphology and Embryology|
|State||Published - Jul 1972|
Bibliographical noteFunding Information:
* This investigation was supported by PHS Research Grants No. AI 00961 and AI 09914 from the National Institute of Allergy and Infectious Diseases. This is Paper No. 7774, Scientific Journal Series, Minnesota Agricultural Experiment Station.