Difflugia microstoma (Thomas, 1954) Ogden, 1983
Diagnosis: Test ovoid or hemispherical, built from small and medium flattened mineral grains and cusps of diatoms. Xenosomes are laid in such a way that a smooth surface is formed. Pseudostome round, surrounded by a small collar of mineral grains.
Dimensions: Length 76-105 microns, width 63-83 microns, apertural diameter 18-29 microns.