Sellaphora labernardierei (Sellaphoraceae, Bacillariophyta), a new epilithic species from French spring and four new combinations within the genus Sellaphora

Phytotaxa ◽  
2016 ◽  
Vol 260 (3) ◽  
pp. 235 ◽  
Author(s):  
AUDE BEAUGER ◽  
CARLOS E. WETZEL ◽  
OLIVIER VOLDOIRE ◽  
ALEXANDRE GARREAU ◽  
LUC ECTOR
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Mineral Waters ◽  
New Combinations ◽  
French Massif Central ◽  
Small Species ◽  
Massif Central ◽  
Floristic Survey ◽  
Scanning Electron

During a floristic survey of freshwater springs in the French Massif Central region, a new Sellaphora species (Bacillariophyceae) was found and is hereby described: Sellaphora labernardierei sp. nov. This new small species, with linear to linear-elliptical valves, slightly inflated in the middle, is formally described using light and scanning electron microscopy. The species has a single H-shaped chloroplast and striae usually biseriate tending to be uniseriate near the centre of the valve. The valve dimensions, the valve, pole and central area shapes, and the striae density and pattern allow their separation from similar taxa belonging to the genera Eolimna, Naviculadicta and Sellaphora. The ecological preferences of Sellaphora labernardierei are mineral waters with high nitrate concentrations. The examination of similar taxa belonging to the genera Eolimna and Naviculadicta and their characteristics lead to propose four new combinations of Sellaphora species.

Four new species of monoraphid diatoms from Western Sichuan Plateau in China

Phytotaxa ◽  
2021 ◽  
Vol 479 (3) ◽  
pp. 257-274
Author(s):  
Q.M. YOU ◽  
K. ZHAO ◽  
Y.L. WANG ◽  
P. YU ◽  
J.P. KOCIOLEK ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Morphological Characteristics ◽  
Similar Species ◽  
Small Species ◽  
Western Sichuan ◽  
The Relationship ◽  
Scanning Electron ◽  
Apical Axis

Four new monoraphid diatoms are examined and described from a high-altitude (> 3000 m) region of western Sichuan, China.  The descriptions are based on light and scanning electron microscopy observations, and the four new species are compared with similar taxa worldwide.  Achnanthidium sichuanense sp. nov. has small, lanceolate-elliptical valves, with rounded apices. The outline and central area differentiate it from similar species.  The unique characteristic of Eucocconeis undulatum sp. nov. is that it has valves that are undulate along the apical axis, forming an “H”-shaped area on both raphe and rapheless valves as seen in light microscope (LM).  Platessa mugecuonesis sp. nov. and Platessa lanceolata sp. nov. are two small species, whose valve outlines and central areas make them different from other species in this genus.  A. sichuanense sp. nov. and E. undulatum sp. nov. are discussed in terms of the relationship between “Achnanthidium & Psammothidium” and “Eucocconeis & Psammothidium”, as these genera are difficult to separate according to morphological characteristics.

A new species of Neidiomorpha (Bacillariophyceae) from Dianshan Lake in Shanghai, China

Phytotaxa ◽  
2019 ◽  
Vol 423 (2) ◽  
pp. 99-104
Author(s):  
FEN LUO ◽  
QI YANG ◽  
KAIJUAN GUO ◽  
TENGTENG LIU ◽  
QUANXI WANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Diatom Species ◽  
Dianshan Lake ◽  
A New Species ◽  
Scanning Electron

A new diatom species, Neidiomorpha dianshaniana sp. nov., found in Dianshan Lake in Shanghai, China, is described herein. The morphology of N. dianshaniana has been documented by light and scanning electron microscopy. Neidiomorpha dianshaniana valves are elliptical in outline with rostrate apices. Raphe is almost straight and filiform. The axial area is narrow and linear. The central area is small, round to transversely elliptical or irregular. Striae are slightly radiate and almost parallel near the apices. Puncta are arranged in undulating longitudinal rows. Neidiomorpha dianshaniana’s most visible feature is its lack of central constriction, in which respect it differs from the three other species in the genus Neidiomorpha.

Two new centric diatoms (Bacillariophyta) from the sub-Antarctic region

Phytotaxa ◽  
2019 ◽  
Vol 394 (1) ◽  
pp. 50 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
VÁCLAV HOUK
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Soil Samples ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Main Island ◽  
Centric Diatoms ◽  
Heard Island ◽  
Scanning Electron

During a survey of the limno-terrestrial diatom flora of the sub-Antarctic region, two unknown melosiroid diatom taxa were observed in several shaded, damp cave (moss and soil) samples from Heard Island and Ile de la Possession, the main island of the Crozet Archipelago. Comparison with already known species from the genus Melosira and the recently described genera Arcanodiscus, Angusticopula and Ferocia, resulted in the description of both new taxa based on detailed light and scanning electron microscopy. A first species was described as Ferocia subantarctica sp. nov. and can be distinguished based on its numerous, narrow girdle bands, relatively weakly domed valves, a limited number of well-developed spines and a rather large, hyaline central area. The second species, Arcanodiscus desmetianus Van de Vijver sp. nov., can be recognized based on its solitary frustules, a series of parallel ridges surrounding the mantle and a hyaline central area that is only less than 50% of the total valve diameter. Both taxa are morphologically and ecologically characterized and compared with all known melosiroid taxa worldwide.

A re-description of Fragilaria fonticola Hustedt and its varieties, with three new combinations and one new species from India

Phytotaxa ◽  
2020 ◽  
Vol 453 (3) ◽  
pp. 179-198
Author(s):  
ANBUKKARASU VIGNESHWARAN ◽  
CARLOS E. WETZEL ◽  
DAVID M. WILLIAMS ◽  
BALASUBRAMANIAN KARTHICK
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
River Basin ◽  
Western Ghats ◽  
Morphological Features ◽  
New Combinations ◽  
One New Species ◽  
Scanning Electron

Tabularia (Kützing) D.M. Williams & Round has received some attention since its separation from Synedra. The present study investigates Fragilaria fonticola Hustedt and its varieties based on the analysis of the type materials. The combinations were proposed as Tabularia fonticola (Hustedt) C.E. Wetzel & D.M. Williams comb. nov. (≡ Fragilaria fonticola Hustedt), Tabularia angusta (Hustedt) C.E. Wetzel & D.M. Williams comb. nov. et stat. nov. (≡ Fragilaria fonticola var. angusta Hustedt), Tabularia chandolensis (Gandhi) A. Vigneshwaran, D.M. Williams & B. Karthick comb. nov. (≡ Synedra chandolensis Gandhi) and the new species, Tabularia koynensis sp. nov. is also described from the Koyna River basin, Western Ghats, India. The detailed morphological features were analysed under light and scanning electron microscopy. Tabularia koynensis has linear valves outline with square to rounded ends. Striae short, radiate towards ends. This new species compared with T. sinensis, T. fasciculata, T. tabulata, T. kobayasii and Fragilaria longissima, which differ in size, valve shape, striae density and ultrastructure.

Oricymba tianmuensis sp. nov., a new cymbelloid species (Bacillariophyceae) from Tianmu Mountain in Zhejiang Province, China

Phytotaxa ◽  
2015 ◽  
Vol 236 (3) ◽  
pp. 257 ◽  
Author(s):  
Wei Zhang ◽  
Yan Ling Li ◽  
J Patrick Kociolek ◽  
Rui Lei Zhang ◽  
Li Qing Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Ventral Side ◽  
Zhejiang Province ◽  
Similar Species ◽  
The West ◽  
West Region ◽  
Freshwater Diatoms ◽  
Scanning Electron

During a survey of freshwater diatoms from streams in the west region of the Tianmu Mountains, Zhejiang Province, China, a new Oricymba species, Oricymba tianmuensis sp. nov. has been recorded. A detailed morphology description of O. tianmuensis is presented, based on light and scanning electron microscopy. Oricymba tianmuensis sp. nov. is characterized by a ridge along the valve face typical of the genus, as well as a linear-lanceolate, symmetrical or slightly dorsiventral outline with a gibbous central portion gradually tapering or nearly paralleling towards the bluntly cuneate poles, a distinct rhombic-lanceolate asymmetric central area with a distinct stigma on the ventral side of the central nodule, a slightly lateral raphe with widened proximal endings and strongly deflected distal endings, and weakly radiate striae. Morphological features of the taxon are compared with similar species, and the biogeography of the genus is summarized.

A new species of the diatom genus Campylodiscus (Bacillariophyta) from Dongtan, Chongming Island, China

Phytotaxa ◽  
2013 ◽  
Vol 115 (2) ◽  
pp. 49
Author(s):  
Patrick Kociolek ◽  
Bo Wu ◽  
Qi Liu ◽  
Quanxi Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Small Species ◽  
Chongming Island ◽  
The World ◽  
Diatom Genus ◽  
A New Species ◽  
Scanning Electron

A new species of genus Campylodiscus is described, Campylodiscus sinensis sp. nov., from Dongtan, Chongming Island, Shanghai, China. It is a small species compared with other species in genus Campylodiscus, with two characteristic kidney-shaped bumps externally and pyramidal verrucae. Light and scanning electron microscopy characteristics of this taxon support its systematic placement in the genus Campylodiscus. This new species is compared with other small species in genus Campylodiscus from around the world. 

Stauroneis fuegiana, a new Stauroneis species (Bacillariophyta) from Tierra del Fuego, southern Argentina

Phytotaxa ◽  
2017 ◽  
Vol 311 (1) ◽  
pp. 85
Author(s):  
VALERIA CASA ◽  
GABRIELA MATALONI ◽  
BART VAN DE VIJVER
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Taxonomic Position ◽  
Tierra Del Fuego ◽  
Peat Bog ◽  
New Taxon ◽  
Diatom Flora ◽  
Scanning Electron

During a survey of the freshwater aquatic diatom flora of two peat bog areas in Tierra del Fuego, southern Argentina, a new taxon belonging to the genus Stauroneis that could not be identified was observed. Based on detailed light and scanning electron microscopy observations and comparison with similar larger-celled Stauroneis species worldwide, the taxon is described as new: Stauroneis fuegiana Casa & Van de Vijver sp. nov. Stauroneis fuegiana can be distinguished based on the slightly raised marginal crest, the typical broadly lanceolate valve outline with subrostrate apices, the almost rectangular central area and its valve dimensions.Comments are made on its taxonomic position and how the new taxon can be distinguished from other larger-celled Stauroneis species. Brief notes on the ecology and distribution are added.

New species of Cymbella and Placoneis (Bacillariophyta) from late Pleistocene Fossil, China

Phytotaxa ◽  
2013 ◽  
Vol 150 (1) ◽  
pp. 29 ◽  
Author(s):  
ZHIJUN GONG ◽  
YANLING LI ◽  
DITMAR METZELTIN ◽  
HORST LANGE-BERTALOT
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Southeast Asia ◽  
Late Pleistocene ◽  
Central Area ◽  
Jianghan Plain ◽  
Breadth Ratio ◽  
Extant Population ◽  
Scanning Electron

This paper describes five new Cymbella, one new Cymbopleura and one new Placoneis species from the late Pleistocene of the Jianghan Plain in China, based on light–and scanning electron microscopy of valve morphology. The characteristic morphological features of the seven new species differ from known established taxa by valve shape, both the central portion and apices, length/breadth ratio, shape of the central area and presence or absence of stigmata. All six cymbelloid taxa are as yet found only in fossil deposits of the Jianghan Plain. The Placoneis species, however is apparently conspecific with an extant population observed in Northern Myanmar (Burma, Southeast Asia). 

Cymbella xiaojinensis sp. nov., a new cymbelloid diatom species (Bacillariophyceae) from high altitude lakes, China

Phytotaxa ◽  
2021 ◽  
Vol 482 (1) ◽  
pp. 55-64
Author(s):  
YUN ZHANG ◽  
MENGNA LIAO ◽  
YAN-LING LI ◽  
FENG-QIN CHANG ◽  
JOHN PATRICK KOCIOLEK
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Morphological Characteristics ◽  
Morphological Description ◽  
Hengduan Mountains ◽  
Diatom Species ◽  
A New Species ◽  
Scanning Electron

This paper describes a new species of Cymbella from an alpine lake in the Hengduan Mountains, southwestern China. The detailed morphological description of the new species, named Cymbella xiaojinensis sp. nov. is presented, based on light and scanning electron microscopy. The main features of C. xiaojinensis are characterized by strongly dorsiventral, triangular valves with a strongly reverse-lateral raphe system positioned near the proximal ends and an asymmetrical, larger central area, occupying approximately 1/2 of the width with the valve. Most morphological characteristics of the new species are similar to C. shudunensis, C. terrafuegiana, C. pamirensis, and C. gravida, but differ in details of size, valve shape, striae density, central area, and number of stigmata.

Description of a new diatom species—Microcostatus dexteri sp. nov.—from terrestrial habitats in southern Poland

Phytotaxa ◽  
2021 ◽  
Vol 509 (2) ◽  
Author(s):  
STANEK-TARKOWSKA JADWIGA ◽  
CZYŻ EWA ANTONINA ◽  
RYBAK MATEUSZ
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Light Microscope ◽  
Central Area ◽  
Diatom Species ◽  
European Species ◽  
Terrestrial Habitats ◽  
A New Species ◽  
Scanning Electron

A new Microcostatus species was found during a study focusing on diatoms present on soils and among terrestrial mosses. Unlike most known European species of this genus, it has easily distinguishable striae under the light microscope and a distinct central area. Additionally, the newly described species shows lack of conopeum and pseudoconopeum. A detailed morphological characterisation using light and scanning electron microscopy of a new species from the genus Microcostatus and comparison to the most similar taxa are given.

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