Two examples of Pleurosigma sinense from Amherst, Burma (now Kyaikkhami, Myanmar). In between two round diatoms. Prepared by William Allott Firth. Olympus BHB microscope using 450nm LED light. As well as the wider group I imaged them using the 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. 38 images Pmax.
Pleurosigma sinensis (Ehrenberg) 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 916. This name is currently regarded as a synonym of Gyrosigma sinense (Ehrenberg) Desikachary 1988. Published in: Desikachary, T.V. (1988). Marine diatoms of the Indian Ocean region. In: Atlas of Diatoms. Fasc. V. pp. 1-13, pls 401-621. Madras: Madras Science Foundation. Page 11, Plate 592, Figures 1-11 (as ‘sinensis‘).