Library > Name > Anisonema

A sudden change of direction

This is a comparatively large oval flagellate with two flagella. The shorter flagellum moves actively at the front, while the longer one trails behind. Usually the orgtanism travels in circles at a leisurely pace, but it is also capable of suddenly revising directions. We can see it passing easily between aggregates thanks to its thin, flat body.


Commentary by Prof. Yuji Tsukii, Hosei University
This organism belongs to genus Anisonema.

There is not enough information to determine its species.

In general, Anisonema acinus can exhibit several cell size and either soft or rigid long flagella extending backward, so it is uncertain whether these organisms are the same or not.

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

The Anisonema in this video is 100μin length, which is much larger than the cell length reported in reference books.

Therefore it is better to classify the organism simply as Anisonema sp.

Sampling Date : 03 July 2009

Sampling Site : Hirose River B  Google Map

A gentle flagellate

This flagellate has two flagella of different lengths at the front. The shorter flagellum vibrates intensively and the longer one curves around the side and extends far behind the body.A diatom caught by the shorter one got free soon .


Commentary by Prof. Yuji Tsukii, Hosei University
This flagellate belongs to genus Anisonema.

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

The organism is characterized by two flagella of different lengths. When it moves, the longer flagellum trails far behind the body.

Sampling Date : 08 August 2009

Sampling Site : Hirose River A  Google Map

Capricious behavior of a flagellate

This flagellate has two flagella of different lengths at the front. The shorter flagellum vibrates intensively and the longer one curves around the side and extends far behind the body. The flagellate is moving in a straight line when it suddenly reverses direction by contracting and expanding the longer flagellum. The flagellate repeats this characteristic behavior many times.


Commentary by Prof. Yuji Tsukii, Hosei University
This flagellate belongs to genus Anisonema.

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

Most scientific research papers focus on Anisonema acinus. But in fact various types of Anisonema can be found in open field environments. The organism appearing in this video looks larger than Anisonema acinus.

Sampling Date : 08 August 2009

Sampling Site : Hirose River A  Google Map

A flagellate'method of locomotion

In this scene of many particles and various sizes of microbes, we can see a relatively large flagellate using an interesting method to get around. It attaches its long, trailing flagellum to an anchor (like a particle or container surface) from which it launches itself forward, pulls back, and propels itself in another direction.


Commentary by Prof. Yuji Tsukii, Hosei University
This organism is Anisonema, which belongs to the Euglenid group.

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

Sampling Date : 18 October 2009

Sampling Site : Hirose River A  Google Map

Reversing course

This 70-micron oval flagellate travels in a straight line, and then suddenly reverses course. The organism has two flagella. The shorter one wiggles vigorously at the front, and the longer one trails behind.


Commentary by Prof. Yuji Tsukii, Hosei University
This organism belongs to genus Anisonema, most likely Anisonema acinus.

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

Sampling Date : 28 May 2009

Sampling Site : Hirose River B  Google Map