Aulacodiscus lahusenii forma typ. from Singelevo, Russia. Single example on the slide. Sty.Aro (Styrax Aroclor) mountant, and dated August 1968. Prepared by ECP Bone. 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. 43 images stacked in Zerene (Pmax).
Aulacodiscus lahusenii Witt 1886. Published in: Witt, O.N. (1886 ‘1885’). Ueber den Polierschiefer von Archangelsk-Kurojedowo im Gouv. Simbirsk. Verhandlungen der Russisch-kaiserlichen Mineralogischen Gesellschaft zu St. Petersburg, Series II 22: 137-177, pls. VI-XII. Page 156, Plate 6 Figure 9, Plate 7 Figure 5. Homotypic Synonym: Tripodiscus lahusenii (O.N.Witt) Kuntze 1898.
See also;
Strelnikova, N.I. & Tsoy, I.B. (Eds) (2008). Diatomovyye vodorosli Rossii i sopredel’nych stran. Iskopayemyye i sovremennyye [The diatoms of Russia and adjacent countries. Fossil and recent]. Vol. 2(5) pp. [1]-167 [1], index, incl. 155 pls. St. Petersburg University Press. [in Russian].
Strelnikova, N.I., Fourtanier, E. & Kociolek, J.P. (2004). Morphological studies of Aulacodiscus species from the “Russian Collection” of the California Academy of Sciences. Diatom Research 19(2): 283-310.