A feeble Euglena and a small organism

A Euglena and an unknown small organism are standing still in this view. Only the flagellum of the Euglena moves somewhat feebly.

Commentary by Prof. Yuji Tsukii, Hosei University
Though the title of this video is a weakened Euglena, some species in the Euglena group exhibit a round shape and remain motionless even when in an active state.

Therefore we cannot say the organism is “weakened” by observing its behavior.

The Euglena agilis cultivated in my lab divide without swimming and keep their round shape.

http://protist.i.hosei.ac.jp/PDB/Im.....

Sampling Date : 18 October 2009

Sampling Site : Hirose River A  Google Map