Triceratium fractum from Oamaru, New Zealand. Single example on the slide. Prepared by JA Long. 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. 68 images stacked in Zerene (Pmax).
Triceratium fractum W.C.Walker & H.H.Chase 1887. Published in: Chase, H.H. & Walker, W.C. (1887). Some new and rare diatoms. Series II-III. pp. 1–12, Photoplates 3-5. Flint, Michigan: Daily News Print. Page 4, Plate 3, Figure 8. This name is currently regarded as a synonym of Triceratium castellatum var. fractum (W.C.Walker & H.H.Chase) Grunow. Source of synonymy: Grunow, A. (1888). Referate. Grove, E. and Sturt, G. On a fossil marine diatomaceous deposit from Oamaru, Otago, New Zealand (Journal of the Quekett Microscopical Club. Ser. II Vol. III. No. 18 and No. 19.1887. Part III and appendix.). Botanisches Centralblatt 34(2/3): 34-41.