scholarly journals Four Achnanthidium species (Bacillariophyta) formerly identified as Achnanthidium minutissimum from the Antarctic Region

2014 ◽  
Author(s):  
Bart Van de Vijver ◽  
Kateřina Kopalová
Keyword(s):  
New Taxa ◽  
Taxonomic Revision ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Electron Microscopical ◽  
Morphological Differences ◽  
The Antarctic ◽  
Scanning Electron

Four taxa belonging to the complex of species around Achnanthidium minutissimum were found during the ongoing taxonomic revision of the Antarctic freshwater and limno-terrestrial diatom flora. Two taxa were previously described as Achnanthidium lailae and A. sieminskae. Two others were formerly identified as A. minutissimum but detailed light and scanning electron microscopical observations revealed sufficient morphological differences compared to the type of A. minutissimum, to justify their separation and description as new taxa: Achnanthidium indistinctum and A. maritimo-antarcticum. The morphology and ecology of all four taxa are discussed comparing the species with morphologically similar taxa. The biogeographical consequences of the splitting of the former A. minutissimum complex in the Antarctic Region are discussed.

Three new Craticula species (Bacillariophyta) from the Maritime Antarctic Region

Phytotaxa ◽  
2015 ◽  
Vol 213 (1) ◽  
pp. 35 ◽  
Author(s):  
Bart Van de Vijver ◽  
Katerina Kopalova ◽  
Ralitsa Zidarova
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
New Taxa ◽  
Taxonomic Revision ◽  
Maritime Antarctic ◽  
Antarctic Region ◽  
Diatom Flora ◽  
South Georgia ◽  
The Antarctic ◽  
Scanning Electron

Three new diatom taxa belonging to the genus Craticula were found during the ongoing taxonomic revision of the Antarctic freshwater and limno-terrestrial diatom flora: Craticula australis, sp. nov., C. obaesa, sp. nov and C. petradeblockiana, sp. nov. Detailed light and scanning electron microscope observations are used to better characterize the morphology and ultrastructure of these three new taxa. A fourth Craticula taxon, formerly identified as Navicula megacuspidata, described from South Georgia, is transferred to the genus Craticula and its taxonomy is briefly discussed. Comparisons with similar taxa and the ecological preferences of each species are added. The revision of these species confirms once again the endemic nature of the Antarctic diatom flora.

Three new araphid diatoms (Bacillariophyta) from the Maritime Antarctic Region

Phytotaxa ◽  
2014 ◽  
Vol 167 (3) ◽  
pp. 256 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
EDUARDO A. MORALES ◽  
KATEŘINA KOPALOVÁ
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
New Taxa ◽  
Maritime Antarctic ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Ecological Preferences ◽  
The Antarctic ◽  
Scanning Electron

A revision of taxa from the genus Staurosira and Staurosirella from the Maritime Antarctic Region, formerly identified as Staurosirella (Fragilaria) pinnata and Fragilaria alpestris, resulted in the description of three new taxa: Staurosira pottiezii Van de Vijver sp. nov., Staurosirella antarctica Van de Vijver & E.Morales sp. nov. and S. frigida Van de Vijver & E.Morales sp. nov. Detailed light (LM) and scanning electron microscope (SEM) observations are used to better characterize the morphology and ultrastructure of these three new taxa. Comparisons with similar taxa and the ecological preferences of each species are added. The revision of these species confirmed the endemic nature of the Antarctic diatom flora. 

Two new Gomphonema species (Bacillariophyta) from the Maritime Antarctic Region

Phytotaxa ◽  
2016 ◽  
Vol 269 (3) ◽  
pp. 209 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
KATEŘINA KOPALOVÁ ◽  
RALITSA ZIDAROVA ◽  
J. PATRICK KOCIOLEK
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Maritime Antarctic ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Ecological Preferences ◽  
The Antarctic ◽  
Scanning Electron

Two new diatom taxa belonging to the genus Gomphonema were recorded during a survey of the Maritime Antarctic freshwater and limno-terrestrial diatom flora: Gomphonema jamesrossense sp. nov. and G.maritimo-antarcticum sp. nov. Detailed light (LM) and scanning electron microscope (SEM) observations are used to characterize the morphology and ultrastructure of the two new Gomphonema taxa. Comparisons with similar taxa and the ecological preferences of each species are added. The revision of these species confirmed the endemic nature of the Antarctic diatom flora.

scholarly journals Microcostatus elisabethianus, a new limnoterrestrial diatom species (Bacillariophyta) from the sub-Antarctic region

2019 ◽  
Vol 152 (3) ◽  
pp. 539-545
Author(s):  
Bart Van de Vijver ◽  
Luc Ector
Keyword(s):  
Indian Ocean ◽  
Morphological Features ◽  
New Taxon ◽  
Diatom Species ◽  
Unique Combination ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Small Cracks ◽  
Electron Microscopical ◽  
Scanning Electron

Background and aims – During a survey of the soil diatom flora of the sub-Antarctic islands in the southern Indian Ocean, an unknown small-celled naviculoid taxon was discovered living in small cracks in cliffs bordering the ocean. The taxon showed a set of morphological features only found in the genus Microcostatus. However, the unknown taxon could not be identified using the currently available literature. Methods – Using both light microscopical and scanning electron microscopical techniques, the morphology of the unknown Microcostatus taxon was documented. The new taxon is described, illustrated and compared with all other similar Microcostatus taxa worldwide. Key results – Microcostatus elisabethianus possesses a unique combination of morphological features that excludes conspecificity with all other members of the genus. It is characterized by a lanceolate valve outline with protracted, elongate apices, a very large, porous conopeum reaching the valve margins and uniseriate striae composed of only one macroareola and mantle areolae restricted to the valve apices. The morphological features of the genus Microcostatus are evaluated and discussed. Notes on the occurrence and ecology of the new taxon are added.

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.

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.

Luticola puchalskiana, a new small terrestrial Luticola species (Bacillariophyceae) from the Maritime Antarctic Region

Phytotaxa ◽  
2020 ◽  
Vol 450 (1) ◽  
pp. 85-94
Author(s):  
NATALIA KOCHMAN-KĘDZIORA ◽  
RALITSA ZIDAROVA ◽  
TERESA NOGA ◽  
MARIA OLECH ◽  
BART VAN DE VIJVER
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Morphological Analysis ◽  
New Taxon ◽  
Maritime Antarctic ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Terrestrial Habitats ◽  
Two Populations ◽  
Scanning Electron

During a survey of the terrestrial diatom flora of the Maritime Antarctic Region, an unknown Luticola taxon that could not be identified using the currently available literature was observed on two islands of the South Shetland Archipelago. After a detailed morphological analysis and comparison, the unknown taxon is described as Luticola puchalskiana sp. nov. The new species can be separated from other Luticola species based on its valve dimensions, stria density and the shape of both central and terminal raphe endings. Two populations of the new taxon were observed in samples collected from terrestrial habitats. The morphology of Luticola puchalskiana is elaborately described and illustrated using both light and scanning electron microscopy observations. A comparison is made with a large number of other morphologically similar Luticola species from the entire (sub)Antarctic Region.

Characterization of atmospheric aerosols in the Antarctic region using Raman Spectroscopy and Scanning Electron Microscopy

2022 ◽  
Vol 266 ◽  
pp. 120452
Author(s):  
César Marina-Montes ◽  
Luis V. Pérez-Arribas ◽  
Jesús Anzano ◽  
Silvia Fdez-Ortiz de Vallejuelo ◽  
Julene Aramendia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Atmospheric Aerosols ◽  
Antarctic Region ◽  
The Antarctic ◽  
Scanning Electron

Frankophila dalevittii, a new freshwater diatom (Bacillariophyta) from Campbell Island

Phytotaxa ◽  
2020 ◽  
Vol 429 (1) ◽  
pp. 57-64
Author(s):  
BART VAN DE VIJVER ◽  
PETRA BALLINGS ◽  
CHARLOTTE GOEYERS
Keyword(s):  
New Species ◽  
Morphological Analysis ◽  
New Taxon ◽  
Diatom Flora ◽  
Southern Pacific Ocean ◽  
Electron Microscopical ◽  
Campbell Island ◽  
A New Species ◽  
Scanning Electron ◽  
Freshwater Diatom

During a survey of the freshwater diatom flora of the sub-Antarctic Campbell Island, located in the southern Pacific Ocean, an unknown freshwater diatom was observed forming long colonies using linking spines. Detailed morphological analysis based on light and scanning electron microscopical observations and comparison with all known Frankophila taxa worldwide justified the description of this unknown taxon as a new species within the genus Frankophila: Frankophila dalevittii Van de Vijver & Goeyers sp. nov. The new taxon is characterized by the presence of well-developed linking spines, the absence of external raphe slits and the presence of internal raphe slits, biseriate striae composed of relatively large areolae and a large axial area. Despite the absence of the external raphe slits, the species is best placed within the genus Frankophila. The new species is described and illustrated and compared with all other Frankophila taxa.

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