Oligosphaeridium patulum
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patulum Riding and Thomas, 1988, p.80–82, pl.3, figs.1–3,5–6; text-figs.8a–b,9b. Holotype: Riding and Thomas, 1988, pl.3, figs.1–2; Fauconnier and Masure, 2004, pl.60, fig.1. Age: early–late Kimmeridgian.
