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

By

Long, Ji-Yan
Williams, David
Liu, Bing (Aquatic ecologist)
Mo, Wen-hui
Quan, Si-Jin

Type

Article

Date of Publication

2022

Original Publication

PhytoKeys

Volume

189

Pages

29--50

Subjects

brackish water , hymen strip , hymen strip region , junction line , valvocopula

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers [2010]-

Identifiers

DOI: https://doi.org/10.3897/phytokeys.189.78149

 

Abstract

Three sympatric Entomoneis species, found at the same specific locality in Lake Qinghai, China, are studied by using light and scanning electron microscope. Two species are proposed as new to science and named as E. sinensis sp. nov. and E. qinghainensis sp. nov. The third species is identified as E. paludosa (W. Smith) Reimer. Entomoneis sinensis has a linear-lanceolate valve outline and Ƨ-shaped keel, bears two distinct 8-shaped loops formed by the valvocopula pars media in each cell and each of its stria is composed of either a long hymen strip or a long hymen strip plus one separated areola close to the raphe. Its hymen strip belongs to Type Two, which is a siliceous membrane strip perforated by two rows of linear pores next to transapical costae and two rows of rounded pores between these two rows of linear pores. Entomoneis qinghainensis has large cells, very high keel and evident hymen strip regions like a U-shaped neck pillow at the middle of valve face. Its hymen strip belongs to Type One, which is a siliceous membrane strip perforated by irregularly distributed round pores. Entomoneis paludosa also has the hymen strip regions that are worm-like and close to the raphe canal. Its hymen strip is same as that of E. qinghainensis. The two kinds of the outside areola occlusions in Entomoneis are compared, summarised and discussed.