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 52-64 µm.
Ecology: Freshwater; clear stagnant water and also among Sphagnum. I found this species in different water types, e.g. peat bogs, an isolated pond in a meadow and the sandy shore of a deep lake (Spiegelplas, Netherlands).
Remarks: This species multiplied well in a moist chamber preparations.