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I found this species in a small lake near Lolo Pass, Montana – Idaho, USA. It multiplied easily in wet chamber mounts.

Cryptodifflugia
Cryptodifflugia
Cryptodifflugia spec. 16.5 and 15.5 µm, mouth 2.78 µm
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
Cryptodifflugia
In older wet chamber preparations a large number of these coupled shells appeared, one empty, the other with a cell, maybe encysted.
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Penardochlamys arcelloides

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Haplomyxa spec

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Lachmannia spec.

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Diplophrys spec. 7

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Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

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Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

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