Ktenodiscus evermanni Hanna (1927)
Comment: Valve with a long, well preserved spine protruding from the central part of the valve face. The mantle is broken on the side facing away from the viewer.
Locality: Eidsbotn Fjord, Devon Island, Nunavut, Canada, sample: EF0103 (Late Cretaceous).
Photographed using: Zeiss Axio.A1, Plan-APOCHROMAT 100×/1.4 Oil DIC + Zeiss AxioCam ICc 5. Stacked using Helicon Focus.
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