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