This is a special type of A. eichhornii with zoochlorellae described by Penard in 1904 as Actinosphaerium eichhornii var. viride. indicates 50 µm.
Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Wolfgang Bettighofer, www.protisten.de.