Membranosphaera bulluliniformis subsp. sphaerica
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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.Membranosphaera bulluliniformis