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Issue: Vol. 245 No. 2: 25 January 2016
Type: Article
Published: 2016-01-25
DOI: 10.11646/phytotaxa.245.2.3
Page range: 119–128
Abstract views: 25
PDF downloaded: 1

Gyrosigma peisonis var. major var. nov., a new variety of Gyrosigma peisonis (Bacillariophyta) from Lake Qinghai, China

State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. box 9825, Beijing 100029, China
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China
Stationsweg 158, 1852LN Heiloo, The Netherlands
Diatom cell size taxonomy Algae China

Abstract

The morphology and ultrastructure of Gyrosigma peisonis var. major var. nov., a new variety of Gyrosigma peisonis found in Lake Qinghai (China), are described here on the basis of light and scanning electron microscopy. Most of the morphological features of this new variety are identical to those of the nominal variety Gyrosigma peisonis var. peisonis, but the variety major differs in its distinctly larger cell size and its higher value for the longitudinal/transverse stria density ratio, however. The seasonal variation of this taxon, which was investigated by a sediment-trap study is also discussed.