Actinoptychus decorans Schmidt (1890)
Comment: Large, nearly intact valve (some portions of the margin are missing) of a morphology that is rather unusual for this genus.
Locality: Oamaru, New Zealand, The Natural History Museum slide BM 35665 (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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