Three examples of Asteromphalus ralfsianus by Watson and Sons Ltd. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo NA 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 monochrome. 39 images stacked in Zerene (Pmax).
Asteromphalus ralfsianus (G.Norman) Grunow, 1867. Published in: Grunow, A. (1867). Diatomeen auf Sargassum von Honduras, gesammelt von Linding. Hedwigia 6(1-3): 1-8, 17-32, 33-37. Page 32. Basionym: Spatangidium ralfsianum G.Norman ex Greville.