Difflugia praestans Penard, 1905
Diagnosis: shell slightly yellow, large, long and straight, tubular, not compressed; fundus rounded with a short sharp spine or sometimes with two short spines. Nucleus vesicular, spherical, with one large central homogeneous nucleolus.
Dimensions: Length 350 – 420 µm (average 375 µm).
Ecology: Fresh water; sediment of deep waters.