Membranosphaera bulluliniformis forma sphaerica Maliavkina in Samoilovitch and Mtchedlishvili, 1961

Now Membranosphaera bulluliniformis ssp. sphaerica. Originally Membranosphaera bulluliniformis forma sphaerica, subsequently (and now) Membranosphaera bulluliniformis ssp. sphaerica.

Holotype: Samoilovitch and Mtchedlishvili, 1961, pl.84, fig.4
Age: Middle Oxfordian-Middle Valanginian