Membranosphaera maastrichtica ssp. pilata (Samoilovitch in Samoilovitch and Mtchedlishvili, 1961) Lentin and Williams, 1973

Originally Membranosphaera maastrichtica var. pilata, subsequently (and now) Membranosphaera maastrichtica ssp. pilata.
Holotype: Samoilovitch and Mtchedlishvili, 1961, pl.83, fig.3
Age: Santonian-Maastrichtian