The test of Arcella

After being collected from a paddy field, the sample was put on 1% agar plate with a drop of distilled water and kept in the dark for 4 days.

Sadly, the Arcella in this video is no longer alive, and only its empty test (shell) remains.

Commentary by Prof. Yuji Tsukii, Hosei University
This organism is definitely Arcella gibbosa.

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

This cell is already dead and only the test (shell) is left. The tests of Arcella gibbosa are thick and have several depressions.

Sampling Date : 22 September 2006

Sampling Site : KASHIMADAI paddy field  Google Map