A group of Asteromphalus heptactis by Watson and Sons Ltd. Mounted in Styrax. Olympus BHB microscope using 450nm LED light. As well as the group I imaged one using the 63x Leitz Pl Apo NA 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 monochrome. 22 images stacked in Zerene (Pmax).
Asteromphalus heptactis (Brébisson) 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 838, Plate 8, Figure 21. Basionym: Spatangidium heptactis Brébisson.