A slide with 8 Japanese Aulisci. Described as ‘scattered’ and scattered they are. Only 3 were still within the red ring. They seem to be mainly A. caelatus or similar, and are present at different angles in the mount. I selected 2 for high magnification imaging. Unknown maker. Olympus BHB microscope using 450nm LED light. 63x Leitz Pl Apo 1.40 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. Image stacks prepared in Zerene (Pmax).
Auliscus sp. 22 images stacked. Underside view with the rim to the coverslip. Could be A. caelatus, but also similar to A. rhipis.
Auliscus asiaticus. 71 images stacked. Broken. Tilted down from top right to bottom left. Probably only 3 ocelli as the edge of the missing piece doesn’t suggest a 4th. Auliscus asiaticus. Described in: Brun, J. & Tempère, J. (1889). Diatomées Fossiles du Japon. Espèces marines et nouvelles des calcaires argileux de Sendaï et de Yedo. Mémoires de la Société de Physique et d’Histoire Naturelle de Genève, 30(9): 75 pp., 9 pls. page 22; plate 2, figure 4. Copy of the figure shown above. Below is a translation:
“AULISCUS ASIATICUS J. Brun.
PI. II, fig. 4. Quite common.
Diameter 160 to 185 µm. Valve with 2, 3, or 4 often unequal oculi, connected by a convex area, higher than the edges and center, which are at the same level. Pearly central region, with interrupted, radiating lines and pruinose. Large, bumpy flank ribs, shagreen (rough, untanned leather), interpruinose, sometimes even slightly toothed. Robust silica, tawny in appearance.
Yédo limestone. Also found in the mud of the bay.
Note: I have tried in vain to relate this species to the already known types. It is related to Aul. sculptus Ralfs, caelatus Bail. and Schmidtii Grund. (A. S. 30. 7), to intercedens Jan. (A. S. 32. 9) and especially to the Aul. speciosus A. S. (80. 5), but cannot fit with any of them, even as a variety.”
Interestingly, I have a slide by Samuel Meakin of Auliscus rhipis from Sydney with 2 diatoms which he described as ‘abnormal’, but look like they could well be 2 ocelli versions of A. asiaticus (see here for the page on that). I will update that page with this information.
I recently acquired about 60 slides by this maker, so if you want to see others by them, search for AAAAA in the Search option at the top of the page, and I’ll include this in each of the pages for them.