Sampling date 06/2024. Scale bars indicate 10 µm (1), 25 µm (2–6).Six images.The vegetative cells of the mother colony perish after reproduction (sexually and asexually). Thus, in flagellates, the phenomenon occurs that certain cells of a colony are excluded from reproduction from the outset (creation of a “corpse” during reproduction).First:The particularly large cells at the posterior pole of the Volvox colony are gonidia, reproductive cells that develop either asexually into daughter colonies or into egg or sperm cells.Second to fourth:First steps towards the daughter colony.The first step can be seen at the bottom left of image center: cleavage no. 1. Above that, in the upper third of the image, another daughter colony has completed the third cell division step: 8 cells.Up to this stage, the cells are not specialized, i.e. totipotent (*). Only the fourth division step (16 cells, see image no. 5 in the image changer) brings about specialization, combined with enormous cell growth.Fifth:Very young daughter colony, 16 cell embryo (*).The cell nuclei in the totipotent cells are very large and clearly visible; from the 4th cleavage onwards, the chloroplasts dominate the appearance of the cells.Sixth:Young daughter colony.Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!Place name: Bog Fleckenried near St. Ulrich am Pillersee (Tyrol)Latitude: 47.506171 Longitude: 12.578852Microscope Zeiss Universal, camera Olympus OM-D M5 MKII. DOF images.(*) Daniel, E. W., Peter, T., & Thompson, R. H. (2006). Cleavage pattern of Volvox aureus (Volvocales).
Transactions of the Kansas Academy of Science,
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