Oligosphaeridium diluculum
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diluculum Davey, 1982b, p.14–15, pl.2, figs.1–5. Holotype: Davey, 1982b, pl.2, figs.1–2; Fauconnier and Masure, 2004, pl.58, figs.1–3. Age: late Ryazanian–early Valanginian.
Parent: Oligosphaeridium