Abstract
During a survey of freshwater diatoms from Mojiang River, Chebaling Nature Preserve in Shaoguan City, Shixing County, Guangdong Province, China, a new Encyonema species, Encyonema chebalingense sp. nov., was discovered. Based on observations with light and scanning electron microscopy, a detailed morphological description of E. chebalingense is here presented. The main features of E. chebalingense include: conspicuously asymmetrical and dorsiventral, semielliptical to semielliptical–lanceolate valves, with a filiform raphe; dorsal margin clearly arched and ventral margin nearly straight or slightly concave; central area on the ventral side formed by 1–2 shorter central striae; and short tectullae projecting within the striae. The new species was compared with some similar species, all of which show similarities to E. chebalingense but differ in features such as dimensions, internal valve structure, stria density and valve shape. This genus is common and abundant in relatively clean waters, and other new species most likely will be recorded in the future from China.
References
Agardh, C.A. (1830) Conspectus criticus diatomacearum. Part 1. Literis Berlingianus, Lund, 16 pp.
Bahls, L. (2013) New diatoms (Bacillariophyta) from western North America. Phytotaxa 82 (1): 7–28. https://doi.org/10.11646/phytotaxa.82.1.2
Coste, M., Tison, J. & Delmas, F. (2007) Pr NF T90–354 Qualité de l’eau. Détermination de l’Indice Biologique Diatomées (IBD). Association Française de Normalisation (AFNOR), La Plaine Saint–Denis, 79 pp.
Cox, E.J. (2004) Pore occlusions in raphid diatoms–a reassessment of their structure and terminology, with particular reference to members of the Cymbellales. Diatom 20: 33–46. http://doi.org/10.11464/diatom1985.20.0_33
Ehrenberg, C.G. (1832) Beiträge zur Kenntnifs der Organisation der Infusorien und ihrer geographischen Verbreitung, besonders in Sibirien. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1830: 1–88. https://doi.org/10.5962/bhl.title.143632
Fu, Z.X. (2018) Taxonomical study of Cymbellaceae and Naviculaceae (Bacillariophttad) from Changbai Mountains Region China. Harbin Normal University, Harbin, 189 pp.
Ge, L., Liu, Y., Kociolek, J.P. & Fan, Y.W. (2013) Newly recorded species of Cymbellaceae and Gomphonemataceae (Bacillariophyta) from Xingkai Lake, China. Acta Botamica Boreali–Occidentalia Sinica 33(10): 2131–2135. http://dx.doi.org/CNKI:SUN:DNYX.0.2013–10–029
Guiry, M.D. & Guiry, G.M. (2021) AlgaeBase. World–wide electronic publication, National University of Ireland, Galway. Available from: http://www.algaebase.org (accessed April 12 2021).
Hu, Z.J., Li, Y.L. & Wang, Y. (2015) New records of Cymbellaceae (Bacillariophyta) in China. Acta Palaeontologica Sinica 54(1): 140–146. http://dx.doi.org/CNKI:SUN:GSWX.0.2015–01–011
Heudre, D., Wetzel, C.E. & Ector, L. (2016) Encyonema bonapartei sp. nov.: a new freshwater diatom species (Cymbellales, Bacillariophyceae) in canals of Great East region (France). Phytotaxa 284(4): 273–280. http://dx.doi.org/10.11646/phytotaxa.284.4.3
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
Krammer, K. (1982) Valve morphology in the genus Cymbella C.A. Agardh. Micromorphology of diatom valves, XI. J. Cramer, Vaduz, 299 pp.
Krammer, K. (1997) Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines and Encyonema Part. Bibliotheca Diatomologica 36: 1–382.
Krammer, K. (2002) Cymbella. In: Lange-Bertalot, H. (Ed.) Diatoms of Europe, Vol. 3. A.R.G. Gantner Verlag K.G., Rugell, 584 pp.
Kulikovskiy, M., Lange-Bertalot, H., Metzeltin, D. & Witkowski, A. (2012) Lake Baikal: Hotspot of Endemic Diatoms. In: Lange-Bertalot, H. (Ed.) Iconographia Diatomologica. Annotated Diatom Micrographs. A.R.G. Gantner Verlag K.G., Rugell, 607 pp.
Kociolek, J.P., Balasubramanian, K., Blanco, S., Coste, M., Ector, L., Liu, Y., 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. (2018) DiatomBase. Available from http://www. diatombase.org (accessed April 12 2021).
Li, S.Z. (1991) Sone basic features of national nature reserve of Cheba-Hill. Ecological Science 000(001): 41–45.
Liu, Q., Li, J., Wang, Q., Kociolek, J.P. & Xie, S. (2021) 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
Marquardt, G.C., da Rocha, A.C.R., Wetzel, C.E., Ector, L. & Bicudo, C.E.M. (2016) Encyonema aquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov.: two new freshwater diatom species (Cymbellales, Bacillariophyceae) from an oligotrophic reservoir in southeastern Brazil. Phytotaxa 247 (1): 62–74. http://dx.doi.org/10.11646/phytotaxa.247.1.4
Ohtsuka, T., Hanada, M. & Nakamura, Y. (2004) SEM observation and morphometry of Encyonema leei (Krammer) nov. comb. Diatom 20: 145–151.
Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The diatoms: Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.
Roy, S., Radhakrishnan, C., Taylor, J.C., Kulikovskiy, M.S. & Karthick, B. (2020) Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent. Cryptogamie, Algologie 41 (2): 7–17. https://doi.org/10.5252/cryptogamie–algologie2020v41a2.
Shi, Z.X. (2013) Flora Algarum Sinicorum Aquae Dulcis Val.16: Bacillariophyta (Cymbellaceae). Science Press, Beijing, 174 pp.
Zhao, T.T. (2017) Preliminary studies of Cymbellaceae and Gomphonemataceae (Bacillariophyta) from part Yunnan Province China. Harbin Normal University, Harbin,
Bahls, L. (2013) New diatoms (Bacillariophyta) from western North America. Phytotaxa 82 (1): 7–28. https://doi.org/10.11646/phytotaxa.82.1.2
Coste, M., Tison, J. & Delmas, F. (2007) Pr NF T90–354 Qualité de l’eau. Détermination de l’Indice Biologique Diatomées (IBD). Association Française de Normalisation (AFNOR), La Plaine Saint–Denis, 79 pp.
Cox, E.J. (2004) Pore occlusions in raphid diatoms–a reassessment of their structure and terminology, with particular reference to members of the Cymbellales. Diatom 20: 33–46. http://doi.org/10.11464/diatom1985.20.0_33
Ehrenberg, C.G. (1832) Beiträge zur Kenntnifs der Organisation der Infusorien und ihrer geographischen Verbreitung, besonders in Sibirien. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1830: 1–88. https://doi.org/10.5962/bhl.title.143632
Fu, Z.X. (2018) Taxonomical study of Cymbellaceae and Naviculaceae (Bacillariophttad) from Changbai Mountains Region China. Harbin Normal University, Harbin, 189 pp.
Ge, L., Liu, Y., Kociolek, J.P. & Fan, Y.W. (2013) Newly recorded species of Cymbellaceae and Gomphonemataceae (Bacillariophyta) from Xingkai Lake, China. Acta Botamica Boreali–Occidentalia Sinica 33(10): 2131–2135. http://dx.doi.org/CNKI:SUN:DNYX.0.2013–10–029
Guiry, M.D. & Guiry, G.M. (2021) AlgaeBase. World–wide electronic publication, National University of Ireland, Galway. Available from: http://www.algaebase.org (accessed April 12 2021).
Hu, Z.J., Li, Y.L. & Wang, Y. (2015) New records of Cymbellaceae (Bacillariophyta) in China. Acta Palaeontologica Sinica 54(1): 140–146. http://dx.doi.org/CNKI:SUN:GSWX.0.2015–01–011
Heudre, D., Wetzel, C.E. & Ector, L. (2016) Encyonema bonapartei sp. nov.: a new freshwater diatom species (Cymbellales, Bacillariophyceae) in canals of Great East region (France). Phytotaxa 284(4): 273–280. http://dx.doi.org/10.11646/phytotaxa.284.4.3
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
Krammer, K. (1982) Valve morphology in the genus Cymbella C.A. Agardh. Micromorphology of diatom valves, XI. J. Cramer, Vaduz, 299 pp.
Krammer, K. (1997) Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines and Encyonema Part. Bibliotheca Diatomologica 36: 1–382.
Krammer, K. (2002) Cymbella. In: Lange-Bertalot, H. (Ed.) Diatoms of Europe, Vol. 3. A.R.G. Gantner Verlag K.G., Rugell, 584 pp.
Kulikovskiy, M., Lange-Bertalot, H., Metzeltin, D. & Witkowski, A. (2012) Lake Baikal: Hotspot of Endemic Diatoms. In: Lange-Bertalot, H. (Ed.) Iconographia Diatomologica. Annotated Diatom Micrographs. A.R.G. Gantner Verlag K.G., Rugell, 607 pp.
Kociolek, J.P., Balasubramanian, K., Blanco, S., Coste, M., Ector, L., Liu, Y., 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. (2018) DiatomBase. Available from http://www. diatombase.org (accessed April 12 2021).
Li, S.Z. (1991) Sone basic features of national nature reserve of Cheba-Hill. Ecological Science 000(001): 41–45.
Liu, Q., Li, J., Wang, Q., Kociolek, J.P. & Xie, S. (2021) 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
Marquardt, G.C., da Rocha, A.C.R., Wetzel, C.E., Ector, L. & Bicudo, C.E.M. (2016) Encyonema aquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov.: two new freshwater diatom species (Cymbellales, Bacillariophyceae) from an oligotrophic reservoir in southeastern Brazil. Phytotaxa 247 (1): 62–74. http://dx.doi.org/10.11646/phytotaxa.247.1.4
Ohtsuka, T., Hanada, M. & Nakamura, Y. (2004) SEM observation and morphometry of Encyonema leei (Krammer) nov. comb. Diatom 20: 145–151.
Round, F.E., Crawford, R.M. & Mann, D.G. (1990) The diatoms: Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.
Roy, S., Radhakrishnan, C., Taylor, J.C., Kulikovskiy, M.S. & Karthick, B. (2020) Encyonema keshrii, sp. nov.: a new diatom species (Cymbellales, Bacillariophyceae) from the Indian subcontinent. Cryptogamie, Algologie 41 (2): 7–17. https://doi.org/10.5252/cryptogamie–algologie2020v41a2.
Shi, Z.X. (2013) Flora Algarum Sinicorum Aquae Dulcis Val.16: Bacillariophyta (Cymbellaceae). Science Press, Beijing, 174 pp.
Zhao, T.T. (2017) Preliminary studies of Cymbellaceae and Gomphonemataceae (Bacillariophyta) from part Yunnan Province China. Harbin Normal University, Harbin,