| German | German Kieselalge. Erste und zweite meiotische Kernteilung, jeweils mit einem pyknotischen Tochterkern, Kernwanderung. Öffnen des eineiigen Oogons, Eindringen eines Spermiums. Befruchtung, Anschwellen der Zygote zur Auxospore, Bildung einer Erstlingszelle aus der Auxospore durch sukzedane Abscheidung zweier Schalen, vegetative Vermehrungsteilung. Mit Zeitraffung. |
| English | English The oogonia of the Stephanopyxis turris, are formed directly from the vegetative cells. Pronounced longitudinal growth is followed by the two meiotic divisions of the nucleus; there are no cytokinesis. After each division of the nucleus one of the daughter nuclei becomes pycnotic. The one-egged oogon opens up and is fertilized by a spermium. The zygote swells up to form the auxospore, increasing significantly in volume. By succedaneous secretion of two shells the first cell emerges from the auxospore; this cell grows to become the colony of a new clone. |
