Triceratium sendaiense from Sendai, Japan. Single example on the slide. Yellowing of the mountant. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. 40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique 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. 77 images stacked in Zerene (Pmax).
Triceratium sendaiense A.W.F.Schmidt, 1891. Published in: Schmidt, A.[W.F.] (1891). Atlas der Diatomaceen-kunde. Series V: Heft [41/42]. pp. pls 161-168. Leipzig: Fues’s Verlag (R. Reisland). Plate 165, Figure 1 (as ‘Sendaïense‘).
Triceratium sendaiense f. quadratum A.W.F.Schmidt, 1891. Published in: Schmidt, A.[W.F.] (1891). Atlas der Diatomaceen-kunde. Series V: Heft [41/42]. pp. pls 161-168. Leipzig: Fues’s Verlag (R. Reisland). Plate 168, Figure 6 (as ‘quadrata‘).
Presumably this is the Triceratium sendaiense f. quadratum.