A closer look on the idiosomes. We see many sieve-like regions which are identical to the proteinaceous matrix of the test, in which idiosomes an xenosome (quartz grains) are embedded. indicates 10 µm. Sample from a freshwater pond on the island of Hiddensee (Baltic Sea, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Wolfgang Bettighofer, www.protisten.de.