Chaos spec
Chaos spec., c. 350 µm, 4 nuclei (two are visible) - Laegieskamp, The Netherlands

 

 

Chaos spec.

 

Diagnosis: locomotive amoebae usually polypodial, like a dead tree with thick truncate branches; in rapid locomotion monopodial. Polypodial forms 360-600 µm; monopodial forms up to 1300 µm; pseudopodia usually with ridges; uroid morulate; multinucleate, nuclei spherical, discoid, concave or convex shaped, 9.6 - 48.0 µm (mean 22 µm; 2-119 nuclei (mean 27 µm) per amoeba; crystals bipyramidal and plate-like, 2.2 µm, sometimes up to 7.9 µm; cysts observed.

 

Ecology: fresh water, ponds and rivers, especially in floating debris in early spring. Not rare.

 

Remarks: I have collected populations of Chaos with both multinucleate and uninucleate specimens!
I have sampled and observed a large number of Chaos-specimens in the Netherlands (several wide spread locations), Sweden (Mörrum-river) and Engeland (Cambridge, pond). All these amoebae had, even within a population, spherical, discoid or convex shaped nuclei, varying in size from 9.6-48.0 µm.

 

Chaos spec.
Chaos spec., polytactic form, about 400 µm
chaos spec.
Chaos spec., changing from polytactic into orthotactic form, 600 µm.
Chaos spec.
The same specimen as above, with two nuclei, 34 and 31 µm.
Chaos spec. nuclei
Specimen with four nuclei, ranging from 30 to 37 µm; three are visible on the micrograph.
Chaos spec.
Specimen with four nuclei, all about 26 µm. Two nuclei are visible.
Chaos spec. nucleus
Chaos spec.
Specimen with only one nucleus.
Chaos spec.
Cytoplasm fully filled with globules