Hyalosphenia cuneata Stein, 1857

Diagnosis: Shell exceedingly transparent, without any pores; shell shorter and broader than H. elegans, greatly compressed, with an indication of a broad rounded keel, colorless; without zoochlorellae; nucleus with some spherical nucleolar fragments.

Dimensions: Length in literature 60—75 µm; my measurements 36—67 µm.

Habitat: Freshwater and among Sphagnum. I found this species in different water types, e.g. peat bogs, an isolated pond in a meadow, an oligotrophic dune lake, the sandy shore of a deep lake (Spiegelplas), a mesotrophic pond (Crailoo) and an eutrophic lake (Gooimeer).

Remarks: This species multiplied well in wet preparations kept in moist chambers .