A skillful hunter
A ciliate seems to be resting between particles. However, its somewhat passive style of hunting is quite efficient. When it waves a transparent membrane extending from one side of its body, food particles are sucked in and transferred inside.
Commentary by Prof. Yuji Tsukii, Hosei University
This organism is Histiobalantium natans.
It is characterized by two types of cilia on the surface: short cilia 10μin length, and sparsely distributed longer cilia. Its mouth is located on the side with a fringe of long cilia called velum.
Sampling Date : 03 July 2009
Sampling Site : Hirose River B Google Map