Riedelia tenuicornis (Greville) Schrader & Fenner (1976)
Comment: A nearly intact valve. Note that the genus Riedelia is surrounded by a considerable confusion, with several names existing and used in parallel (including Williamriedelia with several authorships).
Locality: Cormack's Siding, Oamaru, New Zealand, sample: Cormack's Siding (Eocene-Oligocene Transition).
Photographed using: Zeiss Axio.A1, Plan-APOCHROMAT 100×/1.4 Oil DIC + Zeiss AxioCam ICc 5. Stacked using Helicon Focus.
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