Skip to main content Skip to main navigation menu Skip to site footer
Responsive image
Issue: Vol. 726 No. 2: 30 Oct. 2025
Type: Article
Published: 2025-10-30
DOI: 10.11646/phytotaxa.726.2.4
Page range: 95-102
Abstract views: 170
PDF downloaded: 7

One new Encyonema Kützing (Bacillariophyta, Cymbellaceae) species from the Liujiang River, Guangxi Zhuang Autonomous Region, China

Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China, Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado-80309, USA
Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
diatoms morphology new species taxonomy Algae

Abstract

Encyonema liujiangensis sp. nov., a new freshwater diatom species was found on stones of Liujiang River, Guangxi Zhuang Autonomous Region, China. The morphological features of this new species are presented based on light and scanning electron microscopy. E. liujiangensis sp. nov. exhibits the typical characteristics of the genus, such as dorsiventral valves and the direction of deflection of the external distal raphe ends relative to the dorsal margin. The new species closely resembles E. malaysianum and E. chebalingense and shares certain morphological features with some other members in this genus. However, a distinct combination of morphological features justifies identifying E. liujiangensis sp. nov. as a new species: 1) the outline of valves being distinctly dorsiventral with acutely rounded ends, 2) the narrower valve width, 3) the higher stria density at the ends. Brief notes on the accompanying diatom flora and its ecological characteristics are included.

References

  1. Agardh, C.A. (1830) Conspectus criticus diatomacearum. Part 1. Litteris Berlingianis, Lund, 16 pp.
  2. Battarbee, R.W. (1986) Diatom analysis. In: Norton, S.A. (Ed.) Handbook of Holocene Palaeoecology & Palaeohydrology. John Wiley and Sons, Chichester, UK, pp. 527–570.
  3. Czarnecki, D.B. (1994) The freshwater diatom culture collection at Loras College, Dubuque, Iowa. Memoirs of the California Academy of Sciences 17: 155–174.
  4. Ehrenberg, C.G. (1838) Die Infusionsthierchen als vollkommene organismen. Ein Blick in das tiefere organische Leben de Natur. Verlag von Leopold Voss, Leipzig, pp. xvii, 548, pls. 64. https://doi.org/10.5962/bhl.title.58475
  5. Ehrenberg, C.G. (1832) Über die Entwickelung und Lebensdauer der Infusionsthiere; nebst ferneren Beiträgen zu einer Vergleichung ihrer organischen Systeme. Abhandlungen der Königlichen Akademie der wissenschaften zu Berlin, Physikalische Klasse 1831: 1–154, pls I–IV.
  6. Fu, Z.X. (2018) Taxonomical study of Cymbellaceae and Naviculaceae (Bacillariophttad) from Changbai Mountains Region China. Harbin Normal University, Harbin, 189 pp.
  7. Guiry, M.D. & Guiry, G.M. (2025) AlgaeBase. Available from: https://www.algaebase.org/ (accessed 28 January 2025)
  8. Guo, J.S., Ni, H.P., Li, Y.J., Kociolek, J.P. & Li, Y.L. (2023) Gomphocymbellopsis guijiangensis sp. nov. (Cymbellaceae; Bacillariophyta), a new species from Guangxi Province with comments on associated specimens from Hubei Province, China. Phytotaxa 594 (3): 204–212. https://doi.org/10.11646/phytotaxa.594.3.4
  9. Hu, Z.J., Li, Y.L. & Wang, Y. (2015) New records of Cymbellaceae (Bacillariophyta) in China. Acta Palaeontologica Sinica 54 (1): 140–146.
  10. Huang, R., Ma, J., Wang, X., Blanco, S., Kociolek, J.P. & Zhang, W. (2021) Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China. Phytotaxa 508 (1): 77–84. https://doi.org/10.11646/phytotaxa.508.1.7
  11. Kociolek, J.P., You, Q.M., Liu, Q., Liu, Y & Wang, Q. (2020) Continental diatom biodiversity discovery and description in China: 1848 through 2019. Phytokeys 160: 45–97. https://doi.org/10.3897/phytokeys.160.54193
  12. Kociolek, J.P., Blanco, S., Coste, M., Ector, L., Liu, Y., Karthick, B., Kulikovskiy, M., Lundholm, N., Ludwig, T., Potapova, M., Rimet, F., Sabbe, K., Sala, S., Sar, E., Taylor, J., Van de Vijver, B., Wetzel, C.E., Williams, D.M., Witkowski, A & Witkowski, J. (2025) DiatomBase. Available from: http://www.diatombase.org/ (accessed 28 January 2025)
  13. Krammer, K. (1997a) Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Bibliotheca Diatomologica 36: 1–382.
  14. Krammer, K. (1997b) Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part. Encyonopsis und Cymbellopsis. Bibliotheca Diatomologica 37: 1–469.
  15. Krammer, K. (2003) Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. In: Lange-Bertalot, H. (Ed.) Diatoms of Europe. Vol. 4: Diatoms of the European inland waters and comparable habitats elsewhere. ARG Gantner Verlag KG, Ruggell, 530 pp.
  16. Kützing, F.T. (1833) Synopsis Diatomacearum oder Versuch einer systematischen Zusammenstellung der Diatomeen. Linnaea 8 (5): 529–620. https://doi.org/10.5962/bhl.title.65634
  17. Lange-Bertalot, H. & Simonsen, R. (1978) A taxonomic revision of the Nitzschia lanceolatae Grunow. 2. European and related extra European fresh water and brackish water taxa. Bacillaria 1: 11–111.
  18. Lange-Bertalot, H. (1980) Zur systematischen Bewertung der bandförmigen Kolonien bei Navicula und Fragilaria. Kriterien für die Vereinigung von Synedra (subgen. Synedra) Ehrenberg mit Fragilaria Lyngbye. Nova Hedwigia 33: 723–787.
  19. Levkov, Z. (2009) Amphora sensu lato. In: Lange-Bertalot, H. (Ed.) Diatoms of Europe. Diatoms of the European inland waters and comparable habitats. Vol 5. A.R.G. Gantner Verlag, Ruggel, 918 pp.
  20. Li, Y.L., Bao, M.Y., Liu, W., Kociolek, J.P. & Zhang, W. (2019) Cymbella hechiensis sp. nov., a new cymbelloid diatom species (Bacillariophyceae) from the upper tributary of Liujiang River, Guangxi Province, China. Phytotaxa 425 (1): 49–56. https://doi.org/10.11646/phytotaxa.425.1.4
  21. Liu, Q., Li, J., Wang, Q., Kociolek, J.P. & Xie, S. (2021a) Encyonema oblonga (Bacillariophyta, Cymbellaceae), a new species from Shanxi Province, China. Phytotaxa 480 (3): 284–290. https://doi.org/10.11646/phytotaxa.480.3.8
  22. Liu, W., Li, Y.L., Wu, H. & Kociolek, J.P. (2021b) Delicatophycus liuweii sp. nov., a new cymbelloid diatom (Bacillariophyceae) from an upper tributary of the Liujiang River, Guangxi, China. Phytotaxa 505 (1): 63–70. https://doi.org/10.11646/phytotaxa.505.1.4
  23. Lowe, R.L., Kociolek, P., Johansen, J.R., Vijver, B., Lange-Bertalot, H. & Kopalová, K. (2014) Humidophila gen. nov. a new genus for a group of diatoms (Bacillariophyta) formerly within the genus Diadesmis: species from Hawai'i, including one new species. Diatom Research 29: 351–360. https://doi.org/10.1080/0269249X.2014.889039
  24. Ni, H.P., Guo, J.S., Tang, Z.B., Huang, Y.Y., Kociolek, J.P. & Li, Y.L. (2022) Sellaphora tanghongquii sp. nov. (Bacillariophyta, Sellaphoraceae), a new diatom species from the Southern China. Phytotaxa 573 (1): 103–114. https://doi.org/10.11646/phytotaxa.573.1.6
  25. Ohtsuka, T., Hanada, M. & Nakamura, Y. (2004) SEM observation and morphometry of Encyonema leei (Krammer) nov. comb. Diatom 20: 145–151.
  26. Potapova, M. (2014) Encyonema appalachianum (Bacillariophyta, Cymbellaceae), a new species from Western Pennsylvania, USA. Phytotaxa 184 (2): 115–120. https://doi.org/10.11646/phytotaxa.184.2.4
  27. Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The diatoms. Biology and morphology of the genera. Cambridge University Press, Cambridge, 747 pp.
  28. Smith, W. (1853–1856) A Synopsis of the British Diatomaceae. london, 107 pp.
  29. Tang, Z.B., Guo, J.S., Ni, H.P., Xiao, Q.Z., Kociolek, J.P. & Li, Y.L. (2024) Cymbella liangyanlingii sp. nov. (Bacillariophyta, Cymbellaceae), a new diatom species from the upper tributary of Liujiang River, Guangxi Zhuang Autonomous Region, China. Phytotaxa 637 (2): 190–198. https://doi.org/10.11646/phytotaxa.637.2.6
  30. Zhao, T.T. (2017) Preliminary studies of Cymbellaceae and Gomphonemataceae (Bacillariophyta) from part Yunnan Province China. Harbin Normal University, Harbin, 224 pp.

How to Cite

Guo, J.-S., Zhang, Y., Kociolek, J.P. & Li, Y.-L. (2025) One new Encyonema Kützing (Bacillariophyta, Cymbellaceae) species from the Liujiang River, Guangxi Zhuang Autonomous Region, China. Phytotaxa 726 (2): 95–102. https://doi.org/10.11646/phytotaxa.726.2.4