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Trichamoeba myakka
Polychaos dubium, with abnormal nucleus

In the early spring of 2015 I found numerous specimens of Polychaos dubium. They all had a normal nucleus. Some weeks after, both the amoebae in the samples as and in the wild showed an enlarged nucleus, irregular of shape, granulated en with some larger more or less homogeneous pieces. This might be caused by a parasite.

Polychaos dubium
Polychaos dubium
Normal nucleus, 29 µm, and abnormal nucleus, c. 43 µm
Polychaos dubium
Polychaos dubium with large nucleus (for detail see below)
Polychaos dubium
Polychaos dubium
Nucleus, c. 43 µm in diameter; to the left of the nucleus is the contractile vacuole
Polychaos dubium
Polychaos dubium
Polychaos dubium
n = nucleus
Polychaos dubium
Polychaos dubium
Trophozoit and its nucleus, c. 58 µm in diameter, somewhat compressed by the cover glass.
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