Hystrichosphaeridium membranaceum Philippot, 1949

Now Cymatiosphaera philippotii. Originally Hystrichosphaeridium membranaceum, subsequently (and now) Cymatiosphaera philippotii. See also Cymatiosphaera membranacea (name illegitimate).
Holotype: Philippot, 1949, text-fig.3
Age: Late Cretaceous