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

Ultrastructure of three Species of Entomoneis (Bacillariophyta) from Lake Qinghai of China, with reference to the external areola occlusions

“…These studies have provided a list of taxa, but lack useful illustrations (drawings or micrographs) for the taxa observed. However, some interesting new species recently published have been well documented (Peng et al 2014;2016;Liu et al 2020;Deng et al 2021), confirming that endemic diatom species inhabit this ancient lake. This paper provides further evidence of endemic taxa with the description of two new species of Entomoneis.…”

Diatoma sinensis: a new diatom species (Bacillariophyta) found in the brackish Lake Qinghai, China

“…From this work, a new species Hippodonta qinghainensis Peng & Rioual (Peng et al 2014), and a new variety, Gyrosigma peisonis var. major Peng, Rioual & Sterrenburg (Peng et al 2016) were described. For Diatoma species, Peng (2014) listed D. tenuis C. Agardh, D. moniliformis and D. vulgaris and provided a few illustrations.…”