Grunowiella gemmata (Grunow) Van Heurck (1896)
Comment: Well-preserved valve; note the rimoportula next to the pore field on the head pole (upper right corner).
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 Picolay.
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