Astasia klebsii is very common in the Simmelried. The name of the genus is derived from “Astasis”, which medically means the inability of motor coordination. In fact, Astasia klebsii is extraordinarily metabolic and in constant motion. It is dominated by a disc-shaped widening of the anterior end, which moves in a wave-like manner to the posterior end. But also a twisting of the body along the longitudinal axis is possible. Other characteristic features of Astasia klebsii are the body length of 50–60 µm (of the elongated specimens, s. fig. 1a), the oval or egg-shaped paramylon grains (s. fig. 1 h) and the flagellum approximately of body length (s. fig. 1 g). In all metabolic movements the posterior end remains rounded and does not form a tip.