Brightwellia coronata (Brightwell) Ralfs in Pritchard (1861)
Comment: A strongly fractured valve, but with a well-preserved ring of large openings near the center.
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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