Septa, flat to well fluted; tunnel, single; chomata variable in development.

Fusulinidae with flat or slightly fluted septa, wall of three or four layers including diaphanotheca and generally pronounced outer tectorium.

U Carb - U Permian (as for the family) Fusulininae, Von Möller 1878 Fusulinidae in which the septa are moderately to strongly fluted, wall is composed of 2 to 4 layers including diaphanotheca, the outer tectoria is weakly developed or absent, and chomata or pseudochomata may be present.

Upper Carboniferous - Lower Permian (Wolfcamian/Sakmarian) Eofusulininae, Rauzer-Chernousova & Rosovskaya, 1959.

Early Fusulinidae from the Upper Carboniferous (Moscovian), commonly with only three or four whorls, thin and weakly differentiated walls, inconsistent outer tectorium, prominent axial fillings and a possibility of chomata.