New freshwater diatom genus, Edtheriotia gen. nov. of the Stephanodiscaceae (Bacillariophyta) from south‐central China

Abstract

SUMMARY We describe a new genus and species of the diatom family Stephanodiscaceae with light and scanning electron microscopy from Libo Small Hole, Libo County, Guizhou Province, China. Edtheriotia guizhoiana gen. & sp. nov. has striae across the valve face of varying lengths, and are composed of fine striae towards the margin and onto the mantle. Many round to stellate siliceous nodules cover the exterior of the valve. External fultoportulae opening are short tubes; the opening of the rimportula lacks a tube. Internally a hyaline rim is positioned near the margin. Marginal fultoportulae possess two arcuate opercles. Areolae have domed cribra on the valve face. Those near the margin do not open to the interior. One to three sessile to slightly‐raised rimportulae are placed on the valve face towards the margin; they do not terminate shortened striae towards the center of the valve. This suite of features distinguishes this group from other known genera in the Stephanodicaeae. Cyclotella shanxiensis is transferred to Edtheriotia, making the new combination E. shanxiensis (Xie & Qi) Kociolek et al. comb. nov. It differs from E. guizhoiana by the presence of open pores near the margin of the valve. Features of the new genus are compared and contrasted with others in the Family Stephanodiscaceae. The two species of the genus, unlike most in the family, are known only from rivers and ponds from China and Japan.

A new species of Achnanthes (Bacillariophyceae) from a freshwater habitat in a karst landform from south‐central China

“…As a part of our continuing study of the freshwater diatoms of Guizhou Province, China (Kociolek et al . , ; You et al . , ; Lowe et al .…”

“…As a part of our continuing study of the freshwater diatoms of Guizhou Province, China (Kociolek et al 2016a(Kociolek et al , 2016bYou et al 2016You et al , 2017Lowe et al 2017;Yu et al 2017), we encountered a species of Achnanthes for which we can find no previous description. The purpose of the present report is to present light and scanning electron microscope observations of this Achnanthes species from Guizhou, and to offer a formal description of it as a species new to science.…”

Kulikovskiyia gen. nov. (Bacillariophyceae) from the lateritic rock pools of the Western Ghats, India and from Hainan Province, China

“…More recently, there have been the descriptions of new genera of centric ( Edtheriotia Kociolek, Q.You, Stepanek, R.L.Lowe & Q‐X.Wang in Kociolek et al . ), araphid ( Tibetiella Y.L.Li, D.M.Williams & Metzeltin in Li et al . ) and raphid diatoms.…”

Description of Gomphothidium gen. nov., with light and scanning electron microscopy: A New Freshwater Monoraphid Diatom Genus from Asia

“…abundant from the type locality (Anbou River) in 1976, by 2007 it was locally extinct. Another genus of freshwater diatoms that can be found in China and Japan is Edtheriotia (Kociolek et al 2016), and there are many genera currently known as endemics in Asia. In fact, there are more endemic genera in Asia than any other continent (Kociolek 2019).…”