Quite a large arrangement of Actinocyclus ralfsii. Some damage to the diatoms. No location or makers name. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo 0.45 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. 11mm removed from the tube to the camera to increase the field of view. Monochrome converted Nikon d850 camera. 34 images stacked in Zerene (Pmax).
Actinocyclus ralfsii (W.Smith) Ralfs 1861. Published in: Pritchard, A. (1861). A history of infusoria, including the Desmidiaceae and Diatomaceae, British and foreign. Fourth edition enlarged and revised by J. T. Arlidge, M.B., B.A. Lond.; W. Archer, Esq.; J. Ralfs, M.R.C.S.L.; W. C. Williamson, Esq., F.R.S., and the author. pp. [1]-xii, [1]-968, 40 pls [I-XV]. London: Whittaker and Co.. Page 835. This name is currently regarded as a synonym of Actinocyclus octonarius var. ralfsii (W.Smith) Hendey 1954. Published in: Hendey, N.I. (1954). A preliminary check-list of British marine diatoms. Journal of the Marine Biological Association of the United Kingdom 33: 537-560. Page 557.