Briggera affixa (Ross) Ross & Sims (1985)
Comment: A short, massive valve with tall polar elevations with strongly expanded summits bearing massive, but broken, linking spines.
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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