Hystrichosphaera membranosa
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"membranosa" Archangelsky, 1969b, p.197,199, pl.3, figs.1-4. Holotype: Archangelsky, 1969b, pl.3, figs.1-3. Originally Hystrichosphaera, subsequently Spiniferites. Taxonomic senior synonym: Hystrichosphaera (as and now Achomosphaera) crassipellis, according to Quattrocchio and Sarjeant (1996, p.116). Age: Late Eocene.
Parent: Hystrichosphaera