A couple of nice slides from of diatoms from Manilla (Manila, Philippines). Prepared by Arthur Charles Cole.
First a slide labelled as ‘Triceratia various’ from Manilla .
Olympus BHB microscope using 450nm LED light. As well as the arrangement I imaged some using a 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. Images stacked in Zerene (Pmax).
Trigonium subofficiosum. 54 images stacked. Interesting diamond shaped raised section in the middle. Overall looks a bit like a ‘dip’ holder for 4 dips. From USGS Stuart R. Stidolph Atlas, Plate Forty-one: “Figures 53-54 Trigonium subofficiosum Hustedt in Schmidt et al. 1959. See Hustedt in Simonsen (1987, p. 465, pl. 700, figs. 1-2) a specimen from the Bay of Campeche. The latter figures are identical to the figures presented here, representing a specimen named incorrectly as Trigonium latum, in a select mount by W. A. Firth from a Manila sample on slide HC 2000. The original drawing in Greville (1865, pl. 9, fig. 20) of T. latum is quite different from the HC 2000 specimen.”. Original description: Schmidt, A. (1959). Atlas der Diatomaceen-kunde. Akademie-Verlag. Berlin, Series VIII(Heft 117-118): pls. 465-472. Plate 466, Figure 17. Pretty convinced on this one.
Trigonium bicoronatum. 38 images stacked. Trigonium bicoronatum (Castracane) Mann 1925: 161. Published in: Mann, A. (1925). Marine diatoms of the Philippine Islands. Bulletin United States National Museum 100(6, part 1): 1-182, 39 pls. Page 161, Plate 37 Figure 4 and Plate 38 Figures 1-3. Various other names given. Basionym: Stictodiscus bicoronatus Castracane 1886. Published in: Castracane, [C.A.] F. (1886). Report on the Diatomaceae collected by H.M.S. Challenger during the years 1873-76. In: Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-76. Botany. Vol. II. (Murray, J. Eds), pp. [1]-178. Page 120, Plate VI [6], Figure 5. Again, pretty convinced on this one.
Biddulphia sp. 44 images stacked. Various possibilities; Biddulphia fractosa (Mann 1925, Plate 8 Fig 5 and Plate 10 Figure 1) looks to be a good match. Also perhaps Biddulphia inverta (Mann 1925, Plate 9 Figure 4) but much less sure. Biddulphia fractosa Mann, 1925. Original description: Mann, A. (1925). Marine Diatoms of the Philippine Islands. United States National Museum, Bulletin 100,, 6(part. 1): 182 pp., 39 pls. Page 39, Plate 8 Figure 5, Plate 10 Figure 1. This name is currently regarded as a synonym of Triceratium fractosum (A.Mann) VanLandingham. Published in: VanLandingham, S.L. (1968). Catalogue of the fossil and recent genera and species of diatoms and their synonyms. Bacteriastrum through Coscinodiscus Part 2. pp. 494-1086. Lehre: J. Cramer. Page 530. Not sure with this one, so very much a question mark.
Biddulphia sp. (B. discura ?). 87 images stacked. Tilted downwards towards the upper left. Lens shaped processes along the edges. Maybe Biddulphia discursa (Mann 1925 Page 37, Plate 8, Figure 3) main contender at the moment. Biddulphia broeckii maybe, another good option (Mann 1925) similar but not identical to my other ones. Not sure with this one, so very much a question mark.
Second, a slide labelled Triceratium new species. Single example on the slide.
40x Leitz Pl Apo 1.00 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 91 images stacked in Zerene (Pmax).
Overall two lovely slides with some interesting diatoms on them, however most are beyond my naming ability for now.