Spiniferites membranosus

"membranosus" (Archangelsky, 1969b, p.197,199, pl.3, figs.1–4) Lentin and Williams, 1973, p.128.  Holotype: Archangelsky, 1969b, pl.3, figs.1–3.  Originally Hystrichosphaera, subsequently (and now) Spiniferites.  Taxonomic senior synonym: Hystrichosphaera (as and now Achomosphaera) crassipellis, according to Quattrocchio and Sarjeant (1996, p.116).  Age: late Eocene.

Parent: Spiniferites