Microchlamys n. spec.
This species has a characteristic nucleus, broadly ovoid, where the nucleolar material is arranged peripherally. It was first discovered by Martin Kreutz, who published photomicrographs on a German forum in 2014. Shortly after I found several specimens in a small pond not far from the village of Huizen in the central area of the Netherlands. Food vacuoles contain small algae.
Dimensions: my measurements: shell Ø 47-50 µm, nucleus 10-10.9 µm; Martin Kreutz: shell Ø 42-64 µm.