Skip to main content Skip to main navigation menu Skip to site footer
Responsive image
Issue: Vol. 778 No. 1: 6 Oct. 2026
Type: Article
Published: 2026-10-06
DOI: 10.11646/phytotaxa.778.1.7
Page range: 83-91
Abstract views: 30
PDF downloaded: 2

Pseudoplanothidium skadovskii (Bacillariophyceae, Cocconeidales)—a new small-celled diatom species from the Moscow Region, Russia

Timiryazev Institute of Plant Physiology RAS; 35 Botanicheskaya St.; 127276 Moscow; Russia
Department of Mycology and Algology; Faculty of Biology; Lomonosov Moscow State University; Leninskie Gory 1; building 12; 119234 Moscow; Russia
Timiryazev Institute of Plant Physiology RAS; 35 Botanicheskaya St.; 127276 Moscow; Russia
Algae Moscow Region Planothidium monoraphid diatoms morphology new species

Abstract

A new Pseudoplanothidium species is described from a freshwater pond located on the territory of Zvenigorod Biological Station (Moscow Region, Russia). The description is based on light and scanning electron microscopy observations. Comparisons with other small-celled representatives of the genus are provided. The unique feature of P. skadovskii sp. nov. is the presence of the uniseriate lineolate striae on the rapheless valve.

References

  1. Anissimova, O., Romanova, O. & Tanchenko, E. (2004) Atlas of algae in the water bodies of the S.N. Skadovsky Zvenigorod Biological Station. Study guide for summer practice. Moscow University Publishing House, Moscow, 131 pp. [In Russ.]
  2. Bory de Saint-Vincent, J.B.G.M. (1822) Achnanthe. Achnanthes. In: Audouin et al. (Eds.) Dictionnaire Classique d’Histoire Naturelle. Vol. 1. pp. 79–80. https://doi.org/10.5962/bhl.title.33901
  3. Bukhtiyarova, L. & Round, F.E. (1996) Revision of the genus Achnanthes sensu lato. Psammothidium a new genus based on A. marginulatum. Diatom Research 11 (1): 1–30. https://doi.org/10.1080/0269249x.1996.9705361
  4. Chudaev, D.A. & Blagoveshchenskaya, E.Yu. (2026) Study of vertical stratification of freshwater epipelic diatoms in seminatural conditions. Limnology and Freshwater Biology 4: 488–504. https://doi.org/10.31951/2658-3518-2026-A-4-488
  5. Compère, P. & Van de Vijver, B. (2009) Planothidium engelbrechtii (Cholnoky) Round & Bukhtiyarova: identity and lectotypification (Bacillariophyta). Fottea 9 (2): 187–192. https://doi.org/10.5507/fot.2009.019
  6. Ehrenberg, C.G. (1832) Über die Entwickelung und Lebensdauer der Infusionsthiere; nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme. Abhandlungen der Königlichen Akademie Wissenschaften zu Berlin, Physikalische Klasse 1831: 1–154.
  7. Glushchenko, A.M., Kociolek, J.P., Kuznetsova, I.V. & Kulikovskiy, M.S. (2020) The genus Reimeria Kociolek and Stoermer (Bacillariophyceae) in water ecosystems of Vietnam (Southeast Asia). Inland Water Biology 13: 147–154. https://doi.org/10.1134/s1995082920020054
  8. Gogorev, R.M. & Lange, E.K. (2015) Achnanthoid diatoms (Bacillariophyta) of the relict Lake Mogilnoye (Kildin Island, Barents Sea). Novosti Sistematiki Nizshikh Rasteniy 49: 13–31. https://doi.org/10.31111/nsnr/2015.49.13
  9. Hohn, M.H. & Hellerman, J. (1963) The taxonomy and structure of diatom populations from three eastern North American rivers using three sampling methods. Transactions of the American Microscopical Society 82 (3): 250–329. https://doi.org/10.2307/3223932
  10. Jahn, R., Abarca, N., Gemeinholzer, B., Mora, D., Skibbe, O., Kulikovskiy, M., Gusev, E., Kusber, W.-H. & Zimmermann, J. (2017) Planothidium lanceolatum and Planothidium frequentissimum reinvestigated with molecular methods and morphology: four new species and the taxonomic importance of the sinus and cavum. Diatom Research 32 (1): 75–107. https://doi.org/10.1080/0269249X.2017.1312548
  11. Kociolek, J.P. & Stoermer, E.F. (1987) Ultrastructure of Cymbella sinuata and its allies (Bacillariophyceae), and their transfer to Reimeria, gen. nov. Systematic Botany 12 (4): 451–459. https://doi.org/10.2307/2418882
  12. Kociolek, J.P., You, Q., Yu, P., Li, Y., Wang, Y., Lowe, R. & Wang, Q. (2021) Description of Gomphothidium gen. nov., with light and scanning electron microscopy: a new freshwater monoraphid diatom genus from Asia. Fottea 21 (1): 1–7. https://doi.org/10.5507/fot.2020.011
  13. Krammer, K. & Lange-Bertalot, H. (2004) Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Ergänzungen zu Achnanthes s. l., Navicula s. str., Gomphonema. Gesamtliteraturverzeichnis Teil 1–4. Ergänzter Nachdruck. Süßwasserflora von Mitteleuropa, Bd. 2/4. Spektrum Akademischer Verlag, Heidelberg, 468 pp.
  14. Krasske, G. (1938) Beiträge zur Kenntnis der Diatomeen-Vegetation von Island und Spitzsbergen. Archiv für Hydrobiologie 33: 503–533.
  15. Kulikovskiy, M., Maltsev, Y., Glushchenko, A., Kuznetsova, I., Kapustin, D., Gusev, E., Lange-Bertalot, H., Genkal, S. & Kociolek, J.P. (2020) Gogorevia, a new monoraphid diatom genus for Achnanthes exigua and allied taxa (Achnanthidiaceae) described on the basis of an integrated molecular and morphological approach. Journal of Phycology 56 (6): 1601–1613. https://doi.org/10.1111/jpy.13064
  16. Kulikovskiy, M.S., Kociolek, J.P., Solak, C.N., Kuznetsova, I.V. & Glushchenko, A.M. (2023) New and interesting taxa from the diatom genus Gomphonema Ehrenberg in shallow, nearshore sites on the eastern coast of Lake Baikal. Plants 12: 1835. https://doi.org/10.3390/plants12091835
  17. Kützing, F.T. (1844) Die Kieselschaligen Bacillarien oder Diatomeen. Zu finden bei W. Köhne, Nordhausen, 152 pp. https://doi.org/10.5962/bhl.title.64360
  18. Lange-Bertalot, H., Külbs, K., Lauser, T., Nörpel-Schempp, M. & Willmann, M. (1996) Diatom taxa introduced by Georg Krasske. Documentation and revision. Dokumnetation und Revision der von Georg Krasske beschribenen Diatomeen-Taxa. Iconographia Diatomologica 3: 2–358.
  19. Lange-Bertalot, H., Metzeltin, D. & Witkowski, A. (1996) Hippodonta gen. nov. Umschreibung und Begründung einer neuer Gattung der Naviculaceae. Iconographia Diatomologica 4: 247–275.
  20. Morales, E. (2006) Small Planothidium Round et Bukhtiyarova (Bacillariophyceae) taxa related to P. daui (Foged) Lange-Bertalot from the United States. Diatom Research 21 (2): 325–342. https://doi.org/10.1080/0269249X.2006.9705673
  21. Morales, E.A., Novais, M.H., García, M.L., Maidana, N.I. & Morais, M.M. (2021) Planothidium audax sp. nov. (Bacillariophyta, Achnanthidiaceae), a new diatom from temporary streams in southern Portugal. Phytotaxa 510 (3): 288–294. https://doi.org/10.11646/phytotaxa.510.3.9
  22. Moss, M.O. & Carter, J.R. (1982) The resurrection of Achnanthes rostrata Østrup. Bacillaria 5: 157–164.
  23. Round, F.E. & Basson, P.W. (1997) A new monoraphid diatom genus (Pogoneis) from Bahrain and the transfer of previously described species A. hungarica and A. taeniata to new genera. Diatom Research 12 (1): 71–81. https://doi.org/10.1080/0269249x.1997.9705403
  24. Round, F.E. & Bukhtiyarova, L. (1996) Four new genera based on Achnanthes (Achnanthidium) together with a re-definition of Achnanthidium. Diatom Research 11 (2): 345–361. https://doi.org/10.1080/0269249X.1996.9705389
  25. Round, F.E. (1953) An investigation of two benthic algal communities in Malham Tarn, Yorkshire. Journal of Ecology 41 (1): 174–197. https://doi.org/10.2307/2257108
  26. Thomas, E.W., Van de Vijver, B. & Kociolek, J.P. (2015) Transfer of Rhoicosphenia vanheurckii Grunow to Planothidium Round & Bukhtiyarova. Diatom Research 30 (4): 339–342. https://doi.org/10.1080/0269249x.2015.1084949
  27. Tseplik, N. & Chudaev, D. (2023) Materials for the flora of raphid diatoms of MSU Zvenigorod Biological Station. KMK, Moscow, 168 pp. [In Russ.]
  28. Tseplik, N., Genkal, S., Maltsev, Y., Kuznetsova, I. & Kulikovskiy, M. (2023) Molecular investigation of the Achnanthidium minutissimum complex (Bacillariophyceae) from the Transbaikal Region with the description of three new species. Water 15: 3379. https://doi.org/10.3390/w15193379
  29. Tseplik, N., Maltsev, Y., Glushchenko, A., Genkal, S., Mironova, E. & Kulikovskiy, M. (2024) New cavum-bearing Planothidium (Achnanthidiaceae, Bacillariophyceae) species from the Kamchatka Peninsula, Russia. Phytotaxa 665 (3): 271–281. https://doi.org/10.11646/phytotaxa.665.3.9
  30. Tseplik, N., Maltsev, Y., Glushchenko, A., Genkal, S. & Kulikovskiy, M. (2025a) Molecular phylogeny of the diatom genus Planothidium with the description of Paraplanothidium gen. nov. and Pseudoplanothidium gen. nov. PLoS One 20 (11): e0333782. https://doi.org/10.1371/journal.pone.0333782
  31. Tseplik, N., Glushchenko, A., Mironov, A., Maltsev, Y., Nergui, S. & Kulikovskiy, M. (2025b) First data on molecular phylogeny of the monoraphid genus Platessa (Achnanthidiaceae, Bacillariophyceae) on the basis of P. conspicua from Mongolia. Phytotaxa 731 (2): 102–114. https://doi.org/10.11646/phytotaxa.731.2.1
  32. Tseplik, N., Glushchenko, A., Mironov, A., Chudaev, D., Gololobova, M., Maltsev, Y., Nergui, S. & Kulikovskiy, M. (2026) Two new species of Gogorevia (Achnanthidiaceae, Bacillariophyceae) from Mongolia and Russia. Diatom Research. https://doi.org/10.1080/0269249x.2026.2689221

How to Cite

Tseplik, N., Chudaev, D. & Kulikovskiy, M. (2026) Pseudoplanothidium skadovskii (Bacillariophyceae, Cocconeidales)—a new small-celled diatom species from the Moscow Region, Russia. Phytotaxa 778 (1): 83–91. https://doi.org/10.11646/phytotaxa.778.1.7