Difflugia elegans var. angustata (Penard, 1890) Deflandre, 1926
Diagnosis: The variety differs from the type by its more slender pace and its smaller size and the commonly curved spine. The width is proportionately smaller, the mouth remaining substantially similar; nucleus with a limited number of nucleoli; nucleoli with small lacunae.
Dimensions: Length 61-96 µm (n=20); nucleus diameter 14.3 µm (n=1).
Remarks: I found this variety together with a population of of the typical D. elegans in Gaasterland, 2019. The distinction between both groups was clear. Maybe this is not a variety but a true species.