Amoeboid of the month

 

Arcella spectabilis

 

Last week I collected some sediment from my favorite ditch at the Naardermeer and found some empty shells of Centropyxis marsupiformis. Vines of this kind are very rare and this is the first time I found it. At first sight, it looks like a Difflugia species, but the aperture is oblique, with an angle of about 60° relative to the longitudinal axis. My shells are very similar to those illustrated by Leidy in his beautiful book of 1879.

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Testate amoebae

 

Hyalosphenia - Assulina - Arcella - Difflugia - Cyphoderia - Centropyxis - Nebela