From Fensome et al., 2019:
Amphorosphaeridium axiale, (Eisenack, 1965b, p.150, pl.15, figs.1–4) Davey, 1969c, p.35.
Holotype: Eisenack, 1965b, pl.15, fig.2.
NOW Fibrocysta.
Originally Cordosphaeridium, subsequently Lanternosphaeridium, thirdly Amphorosphaeridium, fourthly (and now) Fibrocysta.
Age: Late Eocene–Early Oligocene.


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Original description: [Eisenack, 1965, p. 150]:

Diagnosis:
Central shell oval, with axial-symmetrically arranged, relatively long and thin processes. The latter extend from the fibres of a very delicate outer layer, are broadened at their bases, and split distally, more or less irregularly and brush-like, into 3 or more tips bent-apart. The apical pole is marked by a substantially broader and often longer process, which is mostly more deeply branched than the other processes. The pylome is situated subapically, has a rounded horseshoe shape, and extends onto the equator.

Dimensions:
holotype: shell 57x71 µm, total 104x116 µm.
Shell dimensions between 58x62 an 67x78 µm, the total dimensions between 103x123 and 114x135 µm.