From Fensome et al., 2019:
Membranosphaera bulluliniformis ssp. bulluliniformis Autonym. Holotype: Samoilovitch and Mtchedlishvili, 1961, pl.84, figs.1a–b.
Nomenclatural junior synonym: Membranosphaera bulliniformis forma typica, which has the same holotype.
---------------------------------------------------------------------------------------------------