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.