MIKHAILOVELLA Ganelina, 1956
Type species: Endothyrina? gracilis
Rauzer-Chernousova, 1948 (*2517),
p. 163; OD.
Mikhailovella Ganelina, 1956 (*1212), p. 100.
Test streptospirally enrolled in the early stage, later uncoiled and rectilinear, chambers inflated, septa arched forward, sutures depressed; wall calcareous, microgranular, dark and homogeneous, thin and of constant thickness throughout; aperture basal, low, and slitlike in the early enrolled part, becoming terminal and cribrate in the later enrolled chambers or only in the uncoiled stage. L. Carboniferous (M. Visean); USSR: Moscow Basin; USA: Idaho, Utah.