Asteromphalus variabilis (spelt Asterompalus on the slide) from Yedo, Japan. Yedo is the historical name for Tokyo. Single example on the slide. Some visibility of the adhesive to the coverslip in the middle of the diatom. No makers name. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 74 images stacked in Zerene (Pmax).
Asteromphalus variabilis (Greville) J.Rattray, 1890. Published in: Rattray, J. (1890). A revision of the genus Coscinodiscus Ehrb., and some allied genera. Proceedings of the Royal Society of Edinburgh 16: 449-692, pls I-III. Page 655. Homotypic synonym: Asterolampra variabilis Greville 1860. Published in: Greville, R.K. (1860). A monograph of the genus Asterolampra, including Asteromphalus and Spatangidium. Transactions of the Microscopical Society of London, New Series 8: 102-124, pls III-IV. Page 111, Plate III, Figures 6-8.