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.
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