Sphynctolethus pacificus (Hajós) Sims (1986)
Comment: Specimen in valve view. Note the faint parallel costae on the summits of the polar elevations (diagnostic for the genus)..
Locality: Deep Sea Drilling Project Hole 280A (south of South Tasman Rise, southwest Pacific), sample: 29-280A-2-2, 20-21 cm (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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