Triceratium pulvinar Schmidt (1888)
Comment: A broken valve with one pole missing, visible from the interior. Please note that this species is an example of Triceratium in the strict sense.
Locality: Deep Sea Drilling Project Hole 280A (south of South Tasman Rise, southwest Pacific), sample: 29-280A-6-3, 116-117 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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