Family Arcellidae Ehrenberg 1843

 

Diagnosis: Lobose testate amoebae with shell composed of granular chitinoid elements, giving the shell a finely granular appearance; pseudostome distinct, round.

 

 

Genus Arcella
Aperture smaller than half the shell diameter; two or more vesicular nuclei.

Arcella
Arcella
Arcella
Arcella
Arcella

 

Genus Antarcella
In contrast to Arcella only one ovular nucleus.