MIRONOVELLA Dain, 1970

 

 

Type species: Mironovella mjatliukae Dain, 1970; OD.

Mironovella Dain. 1970(*1875), p. 72.Test lenticular, early coiling trochospiral, later nearly planispiral and evolute, cham­bers enlarging slowly as added, narrow inter­nal partition extending into the chamber from the apertural border but not reaching the opposite wall, aligned perpendicular to the axis of coiling, earlier plates resorbed leaving intact only those of the later chambers, septa curved, thickened, and elevated on the spiral side, nearly radial and depressed on the umbil­ical side, peripheral margin bicarinate; wall calcareous, aragonitic, perforate, optically radial, surface with elevated sutures and peripheral keels and may be papillate; aperture nearly peripheral, slightly on the umbilical side of the peripheral carina, an elongate oval slit bordered by a distinct lip, those of earlier chambers filled with shell material, intercameral foramen rounded, areal but near the base of the septum. U. Jurassic (Kimmeridgian) to L. Cretaceous (Hauterivian); USSR; Poland; Germany; England.