Genus Sexangularia Awerintzew, 1906
Diagnosis: Test organic, sometimes with attached mineral particles; cross-section polygonal, mostly hexagonal. Nucleus vesicular.
Sexangularia minutissima (Penard, 1904) Awerintzew, 1906
Tests with broad protuberances Tests with one or more broad or blunt protuberances which are conical, bud, wrath or nipple-shaped. They may be present as
Acuminate tests Tests with one or more spines or bud-like or conical protuberances or just a pointed fundus D. acuminata D. congolensis D. ventricosa D.
Difflugia subaequalis, from Penard, 1910 Difflugia subaequalis Penard, 1910 Diagnosis: Test almost spherical, slightly elongated, with a wide pseudostome, almost as wide as the test
Difflugia ampullula, after Playfair, 1918 Difflugia ampullula Playfair, 1918 Diagnosis: Test broadly ovate, with hemispherical fundus, and sides gradually converging in almost straight lines to
Difflugia stepaneki, from Hager and Haagerova, 1970 Difflugia stepaneki Hager and Haagerova, 1970 Diagnosis: Test broad elliptical, circular in cross-section, with a short neck that