Actinoptychus heliopelta Grunow (1883)
Comment: Large valve with 10 sectors and a prominent, star-shaped hyaline central area.
Locality: Popleine, Maryland, USA, The Natural History Museum slide BM coll. Adams J3114 (early Miocene).
Photographed using: Zeiss Axioplan, Plan-NEOFLUAR 20×/0.5 + Zeiss AxioCam MRc. Stacked using Adobe Photoshop CS6.
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