Raphidodiscus marylandicus Christian (1887)
Comment: Medium-sized, well-preserved valve.
Locality: Hata Formation, Boso Peninsula, Japan, sample: JDS10648 subsample kindly shared by Fumio Akiba (early Miocene).
Photographed using: Zeiss Axio.A1, Plan-APOCHROMAT 100×/1.4 Oil DIC + Zeiss AxioCam ICc 5. Stacked using Helicon Focus.
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