Published May 15, 2026 | Version v1
Taxonomic treatment Open

Shionodiscus oestrupii A. J. Alverson, S. - H. Kang & E. C. Theriot

  • 1. Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada & Advanced Microscopy Facility, Bob Wright Centre, University of Victoria, Victoria, Canada
  • 2. Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada
  • 3. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
  • 4. Hakai Institute, Heriot Bay, Canada & Department of Botany and Biodiversity Research Centre, University of British Columbia, Vancouver, Canada
  • 5. University of Alberta, Edmonton, Canada & Institute for Multidisciplinary Ecological Research in the Salish Sea, Galiano Island, Canada

Description

Shionodiscus oestrupii (Ostenfeld) A. J. Alverson, S. - H. Kang & E. C. Theriot

Coscinosira oestrupii Ostenfeld (1900): 52 — Fryxell and Hasle (1980); Hasle and Syvertsen (1997): 81, 82, pl. 13.

Shionodiscus oestrupii — Alverson et al. (2006): 258; Wilks and Armand (2017); Guiry and Guiry (2025).

Description

Diameter 21.7–23.9 (7–60) μm, pervalvar axis half to twice the diameter. Valve face flat or slightly convex. Mantle low and rounded. Areolae usually larger in central part of valve than closer to the margin, sometimes in sublinear array. One nearly central strutted fultoportula. Rimoportulae is 3–4 areolae from central process. Areolae 9 (6–12) in 10 μm at valve centre. MFPs 3–4 in 10 µm, 0.96–1.1 (0.8–1.9) µm between MFPs.

Notes

iNaturalist ID: 142951511, 142950297 (Fig. 35).

Notes

Published as part of Webber, Mark, Humphrey, Elaine, van Asselt, Arjan, Chang, Alice, Morien, Evan & Simon, Andrew D. F., 2026, Diatoms (Bacillariophyta) of the Salish Sea, Northeast Pacific: annotated checklist and new species reports, pp. e 189060 in Biodiversity Data Journal 14 on page e189060, DOI: 10.3897/BDJ.14.e189060

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Linked records

Additional details

Biodiversity

References

  • Ostenfeld C. H. 1900 Plankton Knudsen M., Ostenfeld C. Iagttagelsen over overfladevandets temperatur, saltholdighed og plankton paa islandske og grønlandske skibsrouter i 1899 Bianco Lunos Kgl. Hof-Bogtrykkeri Copenhagen, Denmark 93
  • Fryxell G. A., Hasle G. R. 1980 The marine diatom Thalassiosira oestrupii: structure, taxonomy and distribution American Journal of Botany 67 5 804 814 10.1002/j.1537-2197.1980.tb07709.x
  • Hasle G. R., Syvertsen E. E. 1997 Marine diatoms Thomas C. R. Identifying marine phytoplankton Academic Press San Diego, USA 874 10.17031/1629
  • Alverson A. J., Kang S. H., Theriot E. C. 2006 Cell wall morphology and systematic importance of Thalassiosira ritscheri, with a description of Shionodiscus gen. nov Diatom Research 21 2 215 262 10.1080/0269249X.2006.9705667
  • Wilks J. V., Armand L. K. 2017 Diversity and taxonomic identification of Shionodiscus spp. in the Australian sector of the Subantarctic Zone Diatom Research 32 3 295 307 10.1080/0269249X.2017.1365015
  • Guiry M. D., Guiry G. M. AlgalBase https://www.algaebase.org2025-10-20T00:46:21+00:00