Chaos laureata (Penard, 1902) comb. nov.
Basionym: Amoeba laureata Penard, 1902

Diagnosis: Usually monopodial, rarely polypodial. Nuclei small and spherical, often more than 1000 in a specimen. Small bi-pyramidal or flat crystals present.

Dimensions: Length about 500-800 µm, up to 1400 µm; nuclei 8-10 µm. My measurements: 11.8-13.3 µm (mean 12.3 µm, n=10) and 7.3-8.7 µm (mean 8.1 µm, n=18).

Habitat: Freshwater. Europe.

Remarks: In 2023, I found a specimen in a Sphagnum-sample from Crailoo, Netherlands. Compared to other Chaos species, the nuclei were spherical and relatively small. I counted about 30 nuclei in the cell, nuclei were 11.8-13.3 µm (mean 12.3 µm, n=10) and nucleoli scattered throughout the nucleus. This specimen could be Chaos laureata.
Some weeks later I found another specimen in a sample from the Naardermeer, Netherlands, with over hundreds of smaller spherical nuclei, 7.3-8.7 µm (mean 8.1 µm, n=18), with peripheral nucleoli. This specimen could also be Chaos laureata.
Both specimens were monopodial and contained numerous small truncated bi-piramidal crystals.