Fottea 2020, 20(1):25-35 | DOI: 10.5507/fot.2019.012

Valve ultrastructure of two species of the diatom genus Gomphonema Ehrenberg (Bacillariophyta) from Yunnan Province, China

Yan Liu1, John Patrick Kociolek2, Xinxin Lu1, Yawen Fan1*
1 College of Life Science and Technology, Harbin Normal University, Harbin, 150025, P. R. China;
* Corresponding author e-mail: fanyaw@163.com
2 Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, U. S. A.

We describe valve ultrastructure of two species of the freshwater diatom genus Gomphonema from a stream and Lugu Lake in Yunnan Province, China, and describe one of these two species as new to Science. Gomphonema emines Skuja was described over 80 years ago. This large, multistigmate species has uniseriate striae without occlusions, large pseudosepta and septa, and internal stigma openings that are round, positioned within ellipsoidal depressions on the extended central nodule. In these features it is distinguished from most of the 'typical' species of the genus. Gomphonema yunnaniana Y.Liu et Kociolek sp. nov. has biseriate striae without occlusions, a large, round external stigma opening and an internal stigma opening that is elevated and contained within a lip-like structure. In these features it is distinguished from the 'typical' species of the genus. We compare these two putatively endemic species from Yunnan with other species groups of the genus.

Keywords: taxonomy, new species, valve ultrastructure, Gomphonema, endemic species, Yunnan, China

Received: April 15, 2019; Accepted: October 14, 2019; Prepublished online: February 18, 2020; Published: April 1, 2020Show citation

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Liu, Y., Kociolek, J.P., Lu, X., & Fan, Y. (2020). Valve ultrastructure of two species of the diatom genus Gomphonema Ehrenberg (Bacillariophyta) from Yunnan Province, China. Fottea, 20(1), 25-35. doi: 10.5507/fot.2019.012
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