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The shell of a large testate amoeba (~360 µm) from surface water in a cattail marsh in the Mer Bleue Bog conservation area. The shell was air-dried, then imaged in a scanning electron microscope at the Canadian Museum of Nature.

The shell of a testate amoeba from the Mer Bleue conservation area. Specimens of Netzelia corona often form agglutinated shells, incorporating found particles. However, they can also form lumpy "tuberculate" shells composed of secreted organic material (similar to Netzelia tuberculata, which is also very common in Mer Bleue samples). This one incorporates a few large grains of sand around the aperture, but is mostly tuberculate.

Samples were air-dried and imaged in a scanning electron microscope at the Canadian Museum of Nature.

It might be P. longicauda. It conforms to the suggested morphology (oval rather than wide) though it doesn't fit strictly in the size range suggested by Maja Łukomska-Kowalczyk et al. (2015 - see below). Length 135 microns, tail length 50 microns.

https://www.researchgate.net/publication/282422579_Delimiting_species_in_the_Phacus_longicauda_complex_Euglenida_through_morphological_and_molecular_analyses