Drawing

Опис:

Polytoma papillata Pascher, 1927. Cells are 8-15 x 18-25 microns, cyst diameter20-30 microns Cell oval-ovoid with a conspicuous, hemispherical papilla, from which emerges two equal, isodynamic flagella. Two anterior contractile vacuoles, and a central nucleus. Many starch grains are scattered throughout the cell. The cytoplasm occasionally contains many differently coloured grains. No stigma. The swimming is slow and spiraling, and the cell may settle on the glass slide by the tip of the papilla. The species produces sporangia with 4 division products.