Trinacria regina Heiberg (1863)
Comment: Small valve with sligthly indented sides and low polar elevations. The valve face center bears a circular, flattened area.
Locality: Kamyshlov, Sverdlovsk District, Russia, sample: Hustedt Collection E1685 (early Eocene).
Photographed using: Zeiss Axio.A1, Plan-APOCHROMAT 100×/1.4 Oil DIC + Zeiss AxioCam ICc 5. Stacked using Helicon Focus.
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