Placoneis modaomensis sp. nov. (Bacillariophyta; Cymbellaceae), a new species from Guangdong Province, China

Author:

Li Yu-Jie1,Guo Ji-Shu1,Ni Hong-Ping1,Huang Ying-Yan2,Kociolek John Patrick3,Li Yan-Ling1

Affiliation:

1. Yunnan University, School of Ecology and Environmental Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Kunming 650500, China

2. Ministry of Ecology and Environment, Administration for Pearl River Basin-South China Sea Ecology and Environment, Center for Ecology and Environment Monitoring and Research, Guangzhou, 510611, China

3. University of Colorado, Museum of Natural History and Department of Ecology and Evoluionary Biology, Boulder, Colorado-80309, USA

Abstract

One new species, Placoneis modaomensis, found in freshwater environment from tributary of the Pearl River which lies in Modaomen Channel, Zhuhai County, Guangdong Province, China, is described based on light and scanning electron microscope observations. P. modaomensis sp. nov. has the morphological features that are typical for the genus, including external terminal raphe fissures curve to the opposite sides and areolae with internal volate occlusions. The new species is similar to P. amphibola (Cleve) E.J. Cox, P. amphiboliformis (Metzeltin, Lange-Bertalot & Soninkhishig) Vishnyakov, P. parvapolonica Lange-Bertalot & Wojtal, P. clementispronina Lange-Bertalot & Wojtal and P. nanoclementis Lange-Bertalot & Wojtal in the shape of the valves and having course striae but it can be easily distinguished by the two main morphological characteristics: external central raphe endings bent in the opposite directions, and areolae covered by volate occlusions externally. The latter feature appears to be new for taxa assigned to the genus Placoneis. Data on the associated diatom flora and its ecology are also given. These findings increase our understanding about the morphology of Placoneis in general and its and distribution of the genus in China.

Publisher

University of Zagreb, Faculty of Science, Department of Biology

Subject

Plant Science,Ecology, Evolution, Behavior and Systematics

Reference57 articles.

1. Mereschkowsky, C., 1903: Über Placoneis, ein neues Diatomeen-Genus. Beihefte zum Botanischen Centralblatt 15, 1–30.

2. Meister, F., 1935: Seltene und neue Kieselalgen I. Bericht der Schweizerischen Botanischen Gesellschaft 44, 88–108.

3. Meister, F., 1932: Kieselalgen aus Asien. Gebrüder Borntraeger Verlag, Berlin.

4. Mayama, S., Kawashima, A., 1998: New combinations for some taxa of Navicula and Stauroneis, and an avowed substitute for a taxon of Eunotia. Diatom 14, 69–71. https://doi.org/10.11464/diatom1985.14.0_69

5. Mann, D.G., Stickle, A.J., 1995: Sexual reproduction and systematics of Placoneis (Bacillariophyta). Phycologia 34, 74–86. https://doi.org/10.2216/i0031-8884-34-1-74.1

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