From Fensome et al., 2019:
Membranosphaera maastrichtica ssp. pilata (Samoilovitch in Samoilovitch and Mtchedlishvili, 1961, p.253, pl.83, figs.3,4a–d) Lentin and Williams, 1973, p.94. Holotype: Samoilovitch and Mtchedlishvili, 1961, pl.83, fig.3. Originally Membranosphaera maastrichtica var. pilata, subsequently (and now) Membranosphaera maastrichtica subsp. pilata. Age: Santonian–Maastrichtian.

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