Fragilaria drouotiana sp. nov.: a new epiphytic freshwater diatom species (Fragilariaceae, Bacillariophyta) in lakes of Northeastern France

2019 ◽  
Vol 155 ◽  
pp. 1-13 ◽  
Author(s):  
David Heudre ◽  
Carlos E. Wetzel ◽  
Laura Moreau ◽  
Luc Ector
Keyword(s):  
Diatom Species ◽  
Northeastern France ◽  
Freshwater Diatom

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.

scholarly journals Distrionella coxiana, a new fragilarioid diatom species (Bacillariophyceae) from Tierra del Fuego, Patagonia, Argentina

2019 ◽  
Vol 152 (2) ◽  
pp. 385-391
Author(s):  
Valeria Casa ◽  
Gabriela Mataloni ◽  
Bart Van de Vijver
Keyword(s):  
Typical Feature ◽  
Morphological Features ◽  
Tierra Del Fuego ◽  
New Taxon ◽  
Diatom Species ◽  
Unique Combination ◽  
Diatom Flora ◽  
Electron Microscopical ◽  
Scanning Electron ◽  
Freshwater Diatom

Background and aims – A few years ago, a new survey started of the freshwater diatom flora from peatbogs of Tierra del Fuego (southern Argentina). During this survey, an unknown fragilarioid diatom belonging to the genus Distrionella that could not be identified using the currently available literature was discovered. Methods – Using both Light Microscopical and Scanning Electron Microscopical techniques, the morphology of the unknown Distrionella species has been analysed. The new taxon is properly described, illustrated and compared with all other possible similar Distrionella taxa, known worldwide. Key results – Distrionella coxiana possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus; it is characterized in having narrow, linear valves with small, capitate apices. Transapical ribs, a typical feature of the genus Distrionella, are only weakly developed. One rimoportula is observed close to the apices. Both apices have well-developed apical porefields. The girdle bands bear one complete row of poroids often accompanied by a second, incomplete row of small poroids. Notes on the occurrence and ecology of the new taxon are added.

Encyonema aquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov.: two new freshwater diatom species (Cymbellales, Bacillariophyceae) from an oligotrophic reservoir in southeastern Brazil

Phytotaxa ◽  
2016 ◽  
Vol 247 (1) ◽  
pp. 62 ◽  
Author(s):  
Gisele Carolina Marquardt ◽  
Angélica Cristina Righetii Da Rocha ◽  
Carlos Eduardo Wetzel ◽  
Luc Ector ◽  
Carlos Eduardo de Mattos Bicudo
Keyword(s):  
New Species ◽  
Surface Sediments ◽  
Low Ph ◽  
Southeastern Brazil ◽  
Diatom Species ◽  
Southeast Brazil ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron ◽  
Freshwater Diatom

Recent research of the plankton and the surface sediments from Ribeirão do Campo reservoir (São Paulo, southeast Brazil) led to identification of two new cymbelloid diatom species: Encyonema acquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov. Their morphology was studied under both light and scanning electron microscopes aiming at describing the two species in detail. The morphology of each species is compared and discussed with morphologically similar taxa. The new species are different from all others in the Cymbellales due to a combination of characteristics including valve outline, striae, areolae structure, and raphe system. Both species were collected from an oligotrophic environment with both low pH and conductivity.

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.

scholarly journals Fragilaria rinoi sp. nov. (Fragilariales, Fragilariophyceae) from periphytic river samples in Central Portugal

2016 ◽  
Author(s):  
Cristina Delgado ◽  
M. Helena Novais ◽  
Saúl Blanco ◽  
Salomé F.P. Almeida
Keyword(s):  
Central Area ◽  
River Basins ◽  
Scanning Electron Micrographs ◽  
Diatom Species ◽  
Alkaline Ph ◽  
Mean Values ◽  
Central Portugal ◽  
Lis River ◽  
Scanning Electron ◽  
Freshwater Diatom

A new benthic freshwater diatom, Fragilaria rinoi Almeida & C.Delgado sp. nov., is described from river periphyton samples in Portugal. Fragilaria rinoi sp. nov. is illustrated and discussed based on populations collected from the Vouga, Mondego and Lis river basins in central Portugal and compared with the type material of Fragilaria vaucheriae (Kütz.) J.B.Petersen. The morphological features of the new diatom species are documented through light and scanning electron micrographs, including a comparative analysis with related species of the genus (F. candidagilae Almeida, C.Delgado, Novais & S.Blanco, F. intermedia Grunow in Van Heurck, F. neointermedia Tuji & D.M.Williams, F. recapitellata Lange-Bert. & Metzeltin, F. perminuta (Grunow) Lange-Bert., F. vaucheriae and F. microvaucheriae C.E.Wetzel & Ector). Fragilaria rinoi sp. nov. is characterized by solitary cells without spines, lanceolate valves with slightly rostrate apices, a narrow, linear axial area, and a large, unilateral central area. Fragilaria rinoi sp. nov. may be confused with F. microvaucheriae in terms of length, striae density and outline, although a morphometric analysis revealed that F. rinoi sp. nov. is significantly wider. Fragilaria rinoi sp. nov. is present in rivers with high dissolved oxygen concentrations, medium to high conductivity, neutral to slightly alkaline pH and high mean values of nitrates and ammonium.

Navicula daochengensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a small mountain lake, Sichuan Province, China

Phytotaxa ◽  
2020 ◽  
Vol 439 (2) ◽  
pp. 150-158
Author(s):  
TING WANG ◽  
JIA-LIN WANG ◽  
QI-CHAO ZHOU ◽  
DMITRY A. CHUDAEV ◽  
J. P. KOCIOLEK ◽  
...  
Keyword(s):  
New Species ◽  
Nature Reserve ◽  
Sichuan Province ◽  
Mountain Lake ◽  
Morphological Description ◽  
Similar Species ◽  
Scanning Electron Micrographs ◽  
Diatom Species ◽  
Scanning Electron ◽  
Freshwater Diatom

In this study, we describe a new freshwater diatom, Navicula daochengensis sp. nov., which was found in a small mountain lake, Lake Congqiancuo, Haizishan Nature Reserve, Daocheng County, Sichuan Province, China. The detailed morphological description of the new species is provided from light and scanning electron micrographs. Navicula daochengensis has a narrowly lanceolate valve outline with broadly-rounded ends. The striate are radiate and convergent to the apices. This new species is compared with similar species, such as Navicula elongata, N. venerablis, N. moralesii and N. radiosa, which differ in size, valve shape, striae density and ultrastructure.

scholarly journals On the factors affecting distributions of freshwater diatom species in a remote South Atlantic archipelago

2012 ◽  
Vol 47 (3) ◽  
pp. 291-309 ◽  
Author(s):  
Roger J. Flower ◽  
Martin Kernan ◽  
Phillipa E. Noon ◽  
Vivienne J. Jones
Keyword(s):  
South Atlantic ◽  
Diatom Species ◽  
Factors Affecting ◽  
Freshwater Diatom

scholarly journals A Patented Rapid Method for Identification of Italian Diatom Species

2019 ◽  
Vol 16 (20) ◽  
pp. 3933
Author(s):  
Camilla Puccinelli ◽  
Stefania Marcheggiani ◽  
Laura Mancini
Keyword(s):  
Rapid Method ◽  
Surface Waters ◽  
Freshwater Ecosystem ◽  
Diatom Species ◽  
Image Capture ◽  
Ecological Requirements ◽  
Unicellular Algae ◽  
Environmental Agency ◽  
Freshwater Diatom

The study of diatoms—unicellular algae of the class Bacillariophyceae—has several applications, first and foremost the evaluation of freshwater ecosystem quality according to the Water Frame Directive 2000/60/EC (WFD). Identification at the species level is a crucial step in diatom studies, considering that species belonging to the same genus have different geographical distributions and different ecological requirements. The Rapid Method for Identification of Italian Diatom Species is aimed at guiding users in the classification of freshwater diatom species. It consists of a digitized flow chart that leads, step by step, to the identification, starting with an image capture by light or electron microscopy. This rapid and easy tool could be useful to workers of an environmental agency when performing the operational monitoring required by the WFD to classify surface waters. It will also expand the application of diatoms in numerous fields. This method has been patented in Italy.

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