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An unknown organism

An unknown organism stands still next to a particle. When observed in a time-lapse video, the particles inside the body move, which is usually a sign of life.

Commentary by Prof. Yuji Tsukii, Hosei University
The organism trying to catch a small diatom on a particle is too small to identify with certainty.

However, there are two features that suggest it may be an amoeba: 1) its slow movement; and 2) its rigid semicircle outline with cytoplasm moving inside.

The organism may be a small Arcella which is trying unsuccessfully to catch the attached diatom.

Sampling Date : 18 October 2009

Sampling Site : Hirose River A  Google Map

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