Membranosphaera bulluliniformis subsp. sphaerica

subsp. sphaerica (Malyavkina in Samoilovitch and Mtchedlishvili, 1961, p.254-255, pl.84, fig.4) Lentin and Williams, 1973, p.94.  Holotype: Samoilovitch and Mtchedlishvili, 1961, pl.84, fig.4.  Originally Membranosphaera bulluliniformis forma sphaerica, subsequently (and now) Membranosphaera bulluliniformis subsp. sphaerica.  Age: Mid Oxfordian-mid Valanginian. Parent: Membranosphaera bulluliniformis