Encyonema bonapartei sp. nov.: a new freshwater diatom species (Cymbellales, Bacillariophyceae) in canals of Great East region (France)

Phytotaxa ◽  
2016 ◽  
Vol 284 (4) ◽  
pp. 273 ◽  
Author(s):  
DAVID HEUDRE ◽  
CARLOS E. WETZEL ◽  
LUC ECTOR
Keyword(s):  
Monitoring Program ◽  
Central Area ◽  
Similar Species ◽  
Ventral Margin ◽  
East Region ◽  
European Water ◽  
Northeastern France ◽  
Physicochemical Data ◽  
A New Species ◽  
Freshwater Diatom

As a part of the Monitoring Program of the European Water Framework Directive, the phytobenthos of streams and canals was studied in the Great East region of northeastern France (French part of Rhine-Meuse river basin and Seine-Normandy basin). A new species, Encyonema bonapartei was identified in canals. Its morphology was examined in detail using light and scanning electron microscopy, which showed a unique combination of measurements and shape: valves are clearly asymmetrical and semi-elliptical to semi-elliptical-lanceolate with central area extended on ventral margin by shorter or missing striae. The striation is almost parallel with areolae indistinguishable in the light microscope. This paper provides comparison with morphologically similar species: Cymbopleura hustedtii, Encyonema brehmii, E. kalbei, E. marvanii, E. reichardtii and E. yuwadeeanum. Encyonema bonapartei was first discovered in the East Canal in 2014. It was then found in the Rhône-to-Rhine Canal and Champagne and Burgundy Canal in 2015. Most likely it will spread further in connected waterways. Information on its autecology is presented using the physicochemical data of the type locality.

Sellaphora davoutiana sp. nov.: a new freshwater diatom species (Sellaphoraceae, Bacillariophyta) in lakes of Northeastern France

Phytotaxa ◽  
2018 ◽  
Vol 346 (3) ◽  
pp. 269 ◽  
Author(s):  
DAVID HEUDRE ◽  
CARLOS E. WETZEL ◽  
LAURA MOREAU ◽  
LUC ECTOR
Keyword(s):  
Central Area ◽  
Mountain Lakes ◽  
Similar Species ◽  
Diatom Species ◽  
Freshwater Lakes ◽  
Floristic Survey ◽  
Glacial Origin ◽  
Northeastern France ◽  
Scanning Electron ◽  
Freshwater Diatom

During a floristic survey of freshwater lakes in the French Grand Est region, a new Sellaphora species (Bacillariophyceae) was found. Its morphology was examined in detail using light and scanning electron microscopy to formally describe it. Sellaphora davoutiana sp. nov. has elliptic-lanceolate valves with broadly protracted, subcapitate apices. Based on available literature, it is compared to morphologically similar species such as Navicula detenta, S. sardiniensis, S. sassiana and S. smirnovii. Valve dimensions, central area shape and striae density and pattern of this new species allow its separation from them. Sellaphora davoutiana has been found in three low-mountain lakes of glacial origin in Northeastern France, with watershed on granitic substratum. Additionally, illustrations of Hustedt type material of Navicula detenta are provided, and this taxon is formally transferred to the genus Adlafia.

Cyclotella deceusteriana, a new centric diatom species (Bacillariophyta) from the sub-Antarctic Region

Phytotaxa ◽  
2018 ◽  
Vol 333 (1) ◽  
pp. 108 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
STEVEN DESSEIN
Keyword(s):  
New Species ◽  
Morphological Analysis ◽  
Central Area ◽  
Centric Diatom ◽  
New Taxon ◽  
Antarctic Region ◽  
Distribution And Ecology ◽  
Electron Microscopical ◽  
A New Species ◽  
Freshwater Diatom

During a survey of the freshwater diatom flora of the sub-Antarctic region (Iles Kerguelen and Iles Crozet) in the southern Indian Ocean, an unknown Cyclotella taxon was observed that was formerly identified as the presumed cosmopolitan C. meneghinana. Detailed morphological analysis based on light and scanning electron microscopical observations and comparison with several similar Cyclotella taxa worldwide justified the description of this unknown taxon as a new species: Cyclotella deceusteriana sp. nov. The new taxon is characterized by the presence of marginal fultoportulae on every costa, hyaline furrows between the raised marginal parts on which the striae are located, 2, occasionally 1, 3 or 4 central fultoportulae and an entirely flat, smooth, relatively small central area. The new species is described and compared with other Cyclotella taxa. Notes on its distribution and ecology are added.

Pinnularia arkadii sp. nov., a new diatom (Naviculales, Bacillariophyceae) from Shemya Island, Alaska, USA

2018 ◽  
Vol 52 (1) ◽  
pp. 83-89 ◽  
Author(s):  
A. A. Neplyukhina ◽  
D. A. Chudaev ◽  
M. A. Gololobova
Keyword(s):  
New Species ◽  
Central Area ◽  
Morphological Characters ◽  
Peat Bog ◽  
Similar Species ◽  
Unique Combination ◽  
Pennate Diatom ◽  
Diatom Genus ◽  
A New Species

Based on a unique combination of morphological characters, a new species of the raphid pennate diatom genus Pinnularia was described from the sediments in MacDonald Point peat-bog, Shemya Island, Alaska, USA. P. arkadii sp. nov. has linear valves with parallel margins, widely rounded ends and central area forming wide fascia; striae are relatively coarse, 5.6–6.6 in 10 μm, not crossed by longitudal bands. This taxon was compared to other morphologically similar species of Pinnularia: P. aestuarii, P. brebissonii, P. eifelana, P. franconica, P. idsbensis, P. inconstans, P. laperousei, P. linearidivergens, P. rabenhorstii var. subantarctica and P. tolottiana. The main morphological characters of P. arkadii and similar taxa are discussed.

Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China

Phytotaxa ◽  
2021 ◽  
Vol 508 (1) ◽  
Author(s):  
RUOHAN HUANG ◽  
JIN MA ◽  
XIANYUN WANG ◽  
SAÚL BLANCO ◽  
JOHN PATRICK KOCIOLEK ◽  
...  
Keyword(s):  
New Species ◽  
Central Area ◽  
Guangdong Province ◽  
Ventral Side ◽  
Morphological Description ◽  
Similar Species ◽  
Dorsal Margin ◽  
Nature Preserve ◽  
Valve Structure ◽  
Freshwater Diatom

During a survey of freshwater diatoms from Mojiang River, Chebaling Nature Preserve in Shaoguan City, Shixing County, Guangdong Province, China, a new Encyonema species, Encyonema chebalingense sp. nov., was discovered. Based on observations with light and scanning electron microscopy, a detailed morphological description of E. chebalingense is here presented. The main features of E. chebalingense include: conspicuously asymmetrical and dorsiventral, semielliptical to semielliptical–lanceolate valves, with a filiform raphe; dorsal margin clearly arched and ventral margin nearly straight or slightly concave; central area on the ventral side formed by 1–2 shorter central striae; and short tectullae projecting within the striae. The new species was compared with some similar species, all of which show similarities to E. chebalingense but differ in features such as dimensions, internal valve structure, stria density and valve shape. This genus is common and abundant in relatively clean waters, and other new species most likely will be recorded in the future from China.

A new marine epiphytic diatom species, Halamphora yundangensis sp. nov. (Bacillariophyceae), from Yundang Lake, Southeast coast of China

Phytotaxa ◽  
2020 ◽  
Vol 450 (2) ◽  
pp. 209-218
Author(s):  
WEIWEI WU ◽  
HUINA LIN ◽  
VISHAL PATIL ◽  
JOHN PATRICK KOCIOLEK ◽  
LIN SUN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Similar Species ◽  
Dorsal Margin ◽  
Ventral Margin ◽  
Diatom Species ◽  
Green Seaweed ◽  
A New Species ◽  
Scanning Electron

Halamphora yundangensis sp. nov. is described as a new species epiphytic on the green seaweed Ulva lactuca, from Yundang Lake, Fujian Province, China. Morphological details of the new species with respect to shape, size and valve ultrastructure are presented, with observations based on light microscopy (LM) and scanning electron microscopy (SEM). The main features of Halamphora yundangensis are dorsiventral, semi-lanceolate valves with convex dorsal margin and straight ventral margin, as well as valve ends distinctly protracted and capitate. Externally, a prominent marginal ridge forming the image of a broad hyaline area is present. Internally, dorsal striae are regularly biseriate, and a row of areolae lies along raphe. The new species is compared with similar species in both Amphora and Halamphora.

Nupela major sp. nov., a new diatom species from Maolan Nature Reserve, central-south of China

Phytotaxa ◽  
2017 ◽  
Vol 311 (3) ◽  
pp. 245 ◽  
Author(s):  
PAN YU ◽  
QINGMIN YOU ◽  
J. PATRICK KOCIOLEK ◽  
REX LOWE ◽  
QUANXI WANG
Keyword(s):  
New Species ◽  
Nature Reserve ◽  
Central Area ◽  
Guizhou Province ◽  
Similar Species ◽  
Diatom Species ◽  
Valve Margin ◽  
Diatom Genus ◽  
Central South ◽  
A New Species

Nupela major sp. nov., a new species of the diatom genus Nupela, is described from Maolan Nature Reserve, Guizhou Province, China. Observations were made using light and scanning electron microscopy documenting the size, shape and ultrastructure of the new species. Valves of the monoraphid frustules are elliptical-lanceolate with more or less cuneate, subtlety protracted ends. The raphe valve has a linear-lanceolate axial area and an irregularly-shaped central area. Striae appear intermittent or disrupted. The rapheless valve has a linear-lanceolate axial area widening in the center to form an asymmetrical central area that can in some specimens reach to the valve margin. The rapheless valve has a contoured valve face, with deep indentations in the axial area. The species is assigned to Nupela by virtue of its external occlusions on the areolae, and compared with similar species in the genus. The new species is found on stones beneath a waterfall and associated with a moss community.

Navicula watveae sp. nov. (Bacillariophyceae) a new diatom species from the Western Ghats, India

Phytotaxa ◽  
2020 ◽  
Vol 433 (1) ◽  
pp. 20-26
Author(s):  
CHERAN RADHAKRISHNAN ◽  
SAMADHAN PARDHI ◽  
MAXIM KULIKOVSKIY ◽  
J. PATRICK KOCIOLEK ◽  
BALASUBRAMANIAN KARTHICK
Keyword(s):  
Western Ghats ◽  
Central Area ◽  
Sensu Stricto ◽  
Similar Species ◽  
Diatom Species ◽  
Peninsular India ◽  
Small Stream ◽  
Western Ghats Of India ◽  
The Western Ghats ◽  
A New Species

A new species of Navicula sensu stricto is described from a small stream from the Kaas Plateau in the northern part of the Western Ghats of India. The species is presented with light and scanning electron microscopy, and compared with similar species like Navicula reinhardtii, N sovereignii, N. aurora and N. gogorevii. This taxon is characterized by rhomboid shape, elongated lineolae, short striae at the central area giving a distinctive shape, and narrowly-rounded apices. The discovery of this taxon signifies that a significant number of species to be discovered in this biodiverse region of peninsular India, especially unique habitats like lateritic plateaus.

scholarly journals On the identity of the rare Fragilaria subconstricta (Fragilariaceae), with Fragilaria species forming ribbon-like colonies shortly reconsidered

2019 ◽  
Vol 152 (2) ◽  
pp. 327-339 ◽  
Author(s):  
David Heudre ◽  
Carlos E. Wetzel ◽  
Laura Moreau ◽  
Bart Van de Vijver ◽  
Luc Ector
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Rare Species ◽  
Central Area ◽  
Similar Species ◽  
New Synonyms ◽  
Freshwater Pond ◽  
Large Numbers ◽  
Northeastern France ◽  
Scanning Electron

Background and aims – During phytoplankton surveys of a freshwater pond in Northeastern France, Fragilaria subconstricta (Bacillariophyceae) was observed. This rare diatom was present in large numbers in several plankton samples from Lachaussée Pond in the French Grand Est region. Methods – The morphology of Fragilaria subconstricta was examined in detail using light and scanning electron microscopy. Its identity is discussed and it is compared to the morphologically most similar species, especially Fragilaria capucina, F. mesolepta Rabenhorst, F. neointermedia and F. tenuistriata. Key results – Fragilaria subconstricta produces ribbon-like colonies and has narrow linear-lanceolate valves with slightly rostrate ends. The central area is rectangular, usually small or even absent. Spatulate linking spines are present all along the valve margins and a single rimoportula is located near one apex at the valve face-mantle junction. An amended diagnosis and new synonyms are proposed for this species. Additionally, the type material of Fragilaria mesolepta and a population of the very rare species Fragilaria capucina have been investigated and illustrated. Conclusions – Fragilaria subconstricta and F. tenuistriata are synonyms. Fragilaria capucina s. str. is a rare species in Europe, and the majority of records for this species should be considered part of the Fragilaria capucina “Sippenkomplex” sensu Krammer & Lange-Bertalot (1991).

scholarly journals Gomphonema svalbardense sp. nov., a new freshwater diatom species (Bacillariophyta) from the Arctic Region

Phytotaxa ◽  
2014 ◽  
Vol 170 (4) ◽  
pp. 250 ◽  
Author(s):  
Eveline Pinseel ◽  
Katerina Kopalova ◽  
Bart Van de Vijver
Keyword(s):  
Central Area ◽  
Arctic Region ◽  
The Arctic ◽  
Similar Species ◽  
New Taxon ◽  
Diatom Species ◽  
Svalbard Archipelago ◽  
Freshwater Diatoms ◽  
Freshwater Diatom ◽  
The Arctic Region

During a survey of freshwater diatoms from lakes in the region of Petuniabukta on Spitsbergen (Svalbard Archipelago) a new Gomphonema species, G. svalbardense sp. nov., has been recorded. The new taxon was previously cited in the literature as G. angustatum var. undulatum but this identification proved to be erroneous. Detailed morphology description of G. svalbardense based on light and scanning electron microscopy is presented in this paper and the morphological features of the taxon have been compared with similar species. Gomphonema svalbardense is characterized by its typical linear, almost naviculoid outline with undulating margins, with clearly inflated central part,  asymmetric central area, lateral raphe with simple straight proximal endings and the weakly radiate striae. History, ecology and biogeography of the species, mainly based on literature data, have been included.

Oricymba xianjuensis sp. nov., a new freshwater diatom (Bacillariophyceae) from Xianju National Park (Zhejiang Province, China)

Phytotaxa ◽  
2016 ◽  
Vol 272 (2) ◽  
pp. 134 ◽  
Author(s):  
WEI ZHANG ◽  
XIN QI ◽  
J. PATRICK KOCIOLEK ◽  
LI-QING WANG ◽  
RUI-LEI ZHANG
Keyword(s):  
New Species ◽  
National Park ◽  
Zhejiang Province ◽  
Morphological Description ◽  
Similar Species ◽  
Ventral Margin ◽  
Apical Pore ◽  
Freshwater Diatoms ◽  
Scanning Electron ◽  
Freshwater Diatom

During a survey of freshwater diatoms from streams in the Xianju National Park, Zhejiang Province, China, a new cymbelloid species, Oricymba xianjuensis sp. nov. has been recorded. This species is assigned to the genus Oricymba by virtue of having a ridge separating the valve face and mantle, the presence of apical pore fields, and areolar openings with dentate occlusions. A detailed morphological description of the new species O. xianjuensis is presented, based on light and scanning electron microscopy. Oricymba xianjuensis sp. nov. is characterized by having a ridge along the valve face, as well as a linear-lanceolate outline with a moderately gibbous central portion gradually tapering towards the round, slightly protracted poles, a slightly lateral raphe with widened proximal endings and strongly deflected distal endings, and radiate striae. The taxon is morphologically compared with similar species of the genus Oricymba. The new species looks most similar to O. latirotundata, but is separated from this species by having more narrow, linear valves and a more tumid ventral margin. These findings add to our understanding the morphology and distribution of the genus Oricymba in China.

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