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Issue: Vol. 704 No. 1: 4 Jun. 2025
Type: Article
Published: 2025-06-04
DOI: 10.11646/phytotaxa.704.1.4
Page range: 49-59
Abstract views: 97
PDF downloaded: 10

Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo

Unit for Environmental Science and Management, North–West University, P Bag X6001, Potchefstroom 2520, South Africa; South African Institute for Aquatic Biodiversity (SAIAB), P Bag 1015, Makhanda 6140, South Africa
Meise Botanic Garden, Nieuwelaan 38, B-1860 Meise, Belgium
Africa D. R. Congo diatoms Eunotia tropicaesilvae Eunotia marginepunctata freshwater new species taxonomy Algae

Abstract

Species in the genus Eunotia commonly occur in waters with acidic to circumneutral pH, low nutrient content, and low dissolved salt concentrations. The genus is also commonly encountered worldwide in dystrophic habitats with high humic acid content. Taxa from this genus are considered to be sensitive to pollution and indicators of good water quality. The Democratic Republic of the Congo, with its remaining tropical forest, has many such waterbodies. Small forest streams support a great diversity of diatoms and Eunotia in particular. These water bodies are often at risk from multiple potential impacts. Documenting and describing diatom species and community structure is important to potentially show future change and aid in developing possible management strategies. Based on a number of investigations in the Yangambi Biosphere Reserve, we describe two new species of Eunotia from tropical forest streams: Eunotia tropicaesilvae sp. nov. and Eunotia marginepunctata sp. nov.

References

  1. Almeida, F.F.de, Santos-Silva, E.N., Ector, L. & Wetzel, C.E. (2018) Eunotia amazonica sp. nov. (Bacillariophyta), a common stalk-forming species from the Rio Negro basin (Brazilian Amazon). European Journal of Phycology 53 (2): 166–179. https://doi.org/10.1080/09670262.2017.1402372
  2. Camburn, K.E. & Charles, J.C. (2000) Diatoms of low-alkalinity lakes in the northeastern United States. Academy of Natural Sciences of Philadelphia, Special Publication 18: 1–152.
  3. Cantonati, M. & Lange-Bertalot, H. (2011) Diatom monitors of close-to-pristine, very-low alkalinity habitats: three new Eunotia species from springs in Nature Parks of the south-eastern Alps. Journal of Limnology 70 (2): 209–211. https://doi.org/10.4081/jlimnol.2011.209
  4. Cholnoky, B.J. (1955) Hydrobiologische Untersuchungen in Transvaal. I. Vergelichung der herbstlichen Algengemeinschaften in Rayton-vlei und Leeufontein. Hydrobiologia 7: 137–209. https://doi.org/10.1007/BF00046690
  5. Cholnoky, B.J. (1960) Diatomeen aus einem Teiche am Mt. Kenya in Mittelafrika. Österreichische Botanische Zeitschrift 107: 351–365. https://doi.org/10.1007/BF01289759
  6. Cholnoky, B.J. (1964) Die Diatomeenflora einiger Gewässer der Ruwenzori-Gebirge in Zentralafrika. Nova Hedwigia 8: 55–101.
  7. Cholnoky, B.J. (1970) Bacillariophycées des marais du lac Bangweolo. In: Symoens, J.-J. (Ed.) Exploration Hydrobiologique du Bassin du lac Bangweolo et du Luapula 5 (1). Cercle hydrobiologique, Bruxelles, pp. 1–71.
  8. Cleve-Euler, A. (1948) Susswässerdiatomeen aus dem Feuerland von Prof. Väinö Auer Gesammelt. Acta Geographica Societas Geographica Fennicae 10 (1): 1–61.
  9. Cocquyt, C. (1998) Diatoms from the northern basin of Lake Tanganyika. Bibliotheca Diatomologica 39: 1–276.
  10. Cocquyt, C. (2000) Biogeography and species diversity of diatoms in the Northern Basin of Lake Tanganyika. Advances in Ecological Research 31: 125–150. https://doi.org/10.1016/S0065-2504(00)31010-8
  11. Cocquyt, C. & Taylor, J.C. (2015) New and interesting Surirella taxa (Surirellaceae, Bacillariophyta) from the Congo basin (DR Congo). European Journal of Taxonomy 133: 1–15. https://doi.org/10.5852/ejt.2015.133
  12. Cocquyt, C., de Haan, M. & Lokele, N.E. (2016) Eunotia rudis sp. nov., a new diatom (Bacillariophyta) from the Man and Biosphere Reserve at Yangambi, Democratic Republic of the Congo. Phytotaxa 272 (1): 73–81. https://doi.org/10.11646/phytotaxa.272.1.4
  13. Cocquyt, C., Mambweni, M.J. & Ngendja, K.M. (2019) Observation of Eunotia enigmatica (Bacillariophyta), a rare South-American diatom species, in the Congo Basin, tropical Africa. Botany Letters 166 (2): 246–253. https://doi.org/10.1080/23818107.2019.1602787
  14. Costa, L.F., Wetzel, C.E., Lange-Bertalot, H., Ector, L. & Bicudo, D.C. (2017) Taxonomy and ecology of Eunotia species (Bacillariophyta) in southeastern Brazilian reservoirs. Bibliotheca Diatomologia 64: 1–302.
  15. Foged, N. (1966) Freshwater diatoms from Ghana. Biologiske Skrifter Det Kongelige Danske Videnskabernes Selskab 15: 1–169.
  16. Frenguelli, J. (1942) XVII. Contribución al conocimiento de las diatomeas Argentinas. Diatomeas del Neuquén (Patagonia). Revista del Museo de la Plata Nueva Serie 5, Botánica 20: 73–219.
  17. Furey, P.C., Lowe, R.L. & Johansen, J.R. (2011) Eunotia Ehrenberg (Bacillariophyta) of the Great Smoky Mountains National Park, USA. Bibliotheca Diatomologica 56: 1–134.
  18. Fusey, P. (1953) Quelques Diatomées rares ou nouvelles de France. Österreichische Botanische Zeitschrift 100 (4/5): 486–490. https://doi.org/10.1007/BF01815053
  19. Fusey, P. (1964) Florule algologique de la République Centrafricaine. Diatomées de quelques collections d’eau de la sous-préfecture de M’Baiki et du parc Saint-Floris. Cahiers de la Maboké 2 (1): 30–36.
  20. Fusey, P. (1966) Florule algologique de la République Centrafricaine. Diatomées de quelques collections d’eau de la sous-préfecture de M’Baiki (2). Cahiers de la Maboké 4 (1): 55–67.
  21. Gasse, F. (1986) East African diatoms: taxonomy, ecological distribution. Bibliotheca Diatomologica 11: 1–202.
  22. Glushchenko, A., Kulikovskiy, M., Kuznetsova, I., Dorofeyuk, N. & Kociolek, J.P. (2018) New species and combinations in the genus Eunotia Ehrenberg 1837 (Bacillariophyceae: Eunotiaceae) from waterbodies of Southeastern Asia. Nova Hedwigia Beiheft 147: 69–103. https://doi.org/10.1127/nova-suppl/2018/009
  23. Golama, S.K.A. (1996) Bacillariophycées, Desmidiées et Euglénophycées de la Région de Kisangani (Zaïre). Académie Royale des Sciences d’Outre-Mer, Mémoires in-8°, Nouvelle Série 23 (3), Bruxelles, 232 pp.
  24. Guermeur, P. (1954) Diatomées de l’Afrique Occidentale Française (Première liste: Sénégal). Catalogues, IFAN, Institut Français d’Afrique Noire, Dakar, 137 pp.
  25. Hustedt, F. (1949) Süsswasser-Diatomeen aus dem Albert-National Park in Belgisch-Kongo. Exploration du Parc National Albert, Mission H. Dumas 8: 1–199.
  26. Krasske, G. (1939) Zur Kieselalgenflora Südchiles. Archiv für Hydrobiologie und Planktonkunde, Stuttgart 35 (3): 349–468.
  27. Kufferath, H. (1957) Quelques algues des rapides de la Ruzizi à Bugarama (Ruanda-Urundi). Académie Royale des Sciences Coloniales, Mémoires in-8, Nouvelle Série 5 (3), Bruxelles, 63 pp.
  28. Kulikovskiy, M., Lange-Bertalot, H., Genkal, S. & Witkowski, A. (2010) Eunotia (Bacillariophyta) in the Holartic: new species from the Russian Artic. Polish Botanical Journal 55 (1): 93–106.
  29. Lange-Bertalot, H., Külbs, K., Lauser, T., Nörpel-Schempp, M. & Willmann, M. (1996) Diatom taxa introduced by Georg Krasske. Documentation and revision. Dokumentation und Revision der von Georg Krasske Beschriebenen Diatomeen-Taxa. Iconographia Diatomologica 3: 2–358.
  30. Lange-Bertalot, H., Witkowski, A. & Bąk, M. (2011) Eunotia and some related genera. Diatoms of Europe 6: 1–780.
  31. Manguin, E. (1939) Complément à l’étude de la flore algologique des riches suintantes de Saint-Léonard-des-Bois (Sarthe). Bulletin de la Société d’Agriculture, Sciences et Arts de la Sarthe 57: 17–34.
  32. Metzeltin, D. & Tremarin, P.I. (2011) Uma nova espécie de Eunotia para o sudeste do Brazil: Eunotia furhmannii. Ihrengia Serie Botanica 66 (2): 201–208.
  33. Moser, G., Lange-Bertalot, H. & Metzeltin, D. (1998) Insel der Endemiten Geobotanisches Phänomen Neukaledonien (Island of endemics New Caledonia - a geobotanical phenomenon). Bibliotheca Diatomologica 38: 464 pp.
  34. Mpawenayo, B. (1985) La flore diatomique des rivières de la plaine de la Rusizi au Burundi. Bulletin de la Société royale de Botanique de Belgique 118 (2): 141–156.
  35. Müller, O. (1903) Bacillariaceen aus dem Nyassalande und einigen benachbarten Gebieten. I. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 34: 9–38.
  36. Müller, O. (1904) Bacillariaceen aus dem Nyassalande und einigen benachbarten Gebieten. II. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 35: 256–301.
  37. Müller, O. (1905) Bacillariaceen aus dem Nyassalande und einigen benachbarten Gebieten. III. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 36: 137–205.
  38. Müller, O. (1910) Bacillariaceen aus dem Nyassalande und einigen benachbarten Gebieten. IV. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 45: 69–122.
  39. Proshkina-Lavrenko, A.I. (Ed.) (1950) Diatomovyi Analiz. Opredelitel’iskopaemykh i sovremennykh diatomikh vodorosleyi. Poryadok Pennales (Diatom Analysis. Manual for identification of fossil and modern diatoms. Order Pennales) 3. Gosudarstvennoye Izdatel’stvo Geologicheskoy; 3, Moscow & Leningrad, 398 pp.
  40. Symoens, J.-J. & van der Werff, A. (1966) Diatomées de quelques cours d’eau des environs de Yangambi (Cuvette centrale zaïroise, Région du Haut-Zaïre). Bulletin du Jardin botanique National de Belgique 65: 347–357. https://doi.org/10.2307/3668458
  41. Taylor, J.C. & Cocquyt, C. (2016) Diatoms from the Congo and Zambezi Basins –Methodologies and identification of the genera. ABC Taxa 16: 1–353.
  42. Taylor, J.C., Cocquyt, C. & Mayama, S. (2016) New and interesting Eunotia (Bacillariophyta) taxa from the Democratic Republic of the Congo, tropical central Africa. Plant Ecology and Evolution 149 (3): 291–307. https://doi.org/10.5091/plecevo.2016.1219
  43. Taylor, J.C., Cocquyt, C. & Walsh, G. (2024) Tropical African diatoms from the Eunotia asterionelloides (Bacillariophyta) species complex, with descriptions of new species. Plant Ecology and Evolution 157 (1): 88–99. https://doi.org/10.5091/plecevo.106779
  44. Van Meel, L. (1954) Le Phytoplancton. Résultats Scientifiques de l’Exploration Hydrobiologique du lac Tanganyika. Institut Royal des Sciences Naturelles de Belgique, Bruxelles, 681 pp.
  45. Wetzel, C.E., Ector, L., Hoffmann, L., Lange-Bertalot, H. & Bicudo, D.C. (2011) Two new periphytic Eunotia species from the neotropical Amazonian ‘black waters’, with a type analysis of E. braunii. Diatom Research 26 (1): 135–146. https://doi.org/10.1080/0269249X.2011.587644
  46. Zanon, V. (1938) Diatomee della Regione del Kivu (Congo Belga) Commentationes Pontificia Academia Scientiarum 2 (14): 535–668.

How to Cite

Taylor, J.C. & Cocquyt, C. (2025) Two new Eunotia species (Eunotiaceae, Bacillariophyta) from the Yangambi Biosphere Reserve, Democratic Republic of the Congo. Phytotaxa 704 (1): 49–59. https://doi.org/10.11646/phytotaxa.704.1.4