From Fensome et al., 2019:
Fibrocysta acornuta Norris and Jux, 1984, p.161–162, pl.1, figs.17–20; pl.2, figs.1–4; pl.3, fig.5; pl.5, figs.1–6. Holotype: Norris and Jux, 1984, pl.2, figs.1–3. Age: late Kimmeridgian–late Tithonian.

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