Drawing

Description:

Urceolus costatus (Stein, 1878) Lemmermann, 1910. Cells are ovate, about 40 - 48 microns long, flexible and with an ingestion organelle with two well developed rods. The collar on the anterior part of the cell is less than 10 microns diameter. The posterior end of the cell is rounded. The cells have strong widely spaced striations. There is one emergent flagellum, which is about the cell length. A lot of food materials and diatoms about 20 microns are present. The position of the nucleus is variable. The cells move by squirming and gliding.