Difflugia bistrica Ogden and Zivkovic, 1983
Diagnosis: Test ovoid or roughly circular, thin and laterally compressed, composed of medium flattened pieces of quartz with smaller particles between to give a smooth surface. Small areas of organic cement occur infrequently, and are usually in the form of a network. The aperture is a regular oval and surrounded by small particles.
Dimensions: Length 104 µm, width 84 µm, thickness 54 µm, diameter of aperture 38 µm (n=1).
Remarks: This species is similar to D. balcanica in dimensions and degree of compression, but differs significantly in having a rounded, smooth shell which is curved gently at the aboral extremity.
This description is based on a single specimen.