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.

Gomphonema alavariense sp. nov. (Cymbellales, Gomphonemataceae) from an urban pond

Phytotaxa ◽  
2020 ◽  
Vol 471 (1) ◽  
pp. 16-28
Author(s):  
LORENA GONZÁLEZ-PAZ ◽  
SALOMÉ F.P. ALMEIDA ◽  
SAÚL BLANCO ◽  
CRISTINA DELGADO
Keyword(s):  
Dissolved Oxygen ◽  
Electron Micrographs ◽  
Central Area ◽  
City Centre ◽  
Scanning Electron Micrographs ◽  
Alkaline Ph ◽  
Urban Pond ◽  
The City ◽  
Scanning Electron ◽  
Freshwater Diatom

Gomphonema alavariense sp. nov. is a new freshwater diatom described in Portugal from phytobenthos samples in an urban pond located in Aveiro (Portugal). This new diatom is illustrated and discussed based on different samples collected in July–August 2017 from Santo António Park pond in the city centre. This taxon was compared with other Gomphonema taxa and the morphological features are documented through light and scanning electron micrographs. Gomphonema alavariense sp. nov. is characterized by showing solitary cells, rhombic-lanceolate to lanceolate valves with rounded apices, a narrow, linear axial area, and slightly asymmetrical central area. This taxon may be confused with G. affine var. rhombicum in terms of length, striae density and outline. Gomphonema alavariense sp. nov. was present in freshwater with low dissolved oxygen concentrations, high conductivity, neutral to slightly alkaline pH and high nitrate concentrations.

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.

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.

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.

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.

Envekadea metzeltinii sp. nov., a new diatom (Bacillariophyta) species from the subtropical karstic wetlands of the Florida Everglades, U.S.A.

Phytotaxa ◽  
2013 ◽  
Vol 115 (1) ◽  
pp. 15 ◽  
Author(s):  
SYLVIA S. LEE ◽  
FRANCO A. C. TOBIAS ◽  
BART VAN DE VIJVER
Keyword(s):  
New Species ◽  
Electron Micrographs ◽  
Related Species ◽  
Florida Everglades ◽  
Type Locality ◽  
Similar Species ◽  
Scanning Electron Micrographs ◽  
Diatom Species ◽  
Scanning Electron

Envekadea metzeltinii sp. nov. is described from periphyton assemblages in the subtropical karstic wetlands of the Florida Everglades, U.S.A. The morphology of the new diatom species is documented by light and scanning electron micrographs and discussed in detail, including comparisons with related species in the genera Envekadea, Caloneis, andNavicula. The new species is characterized by a linear valve outline, a sigmoid raphe course, broad variability in areola shapes and sizes, and two clearly raised axial costae. Apart from the type locality in Florida, the species was observed from similar wetlands in the Yucatan, Mexico. Notes on its ecology and distribution are added.Based on the morphology of the most similar species, Navicula palestinae, the latter is transferred to the genus Envekadea.

Valve morphology of three species of Neidiomorpha (Bacillariophyceae) from Zoigê Wetland, China, including description of Neidiomorpha sichuaniana nov. sp.

Phytotaxa ◽  
2014 ◽  
Vol 166 (2) ◽  
pp. 123 ◽  
Author(s):  
QI LIU ◽  
J. P. KOCIOLEK ◽  
QUANXI WANG ◽  
CHENGXIN FU
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Central Area ◽  
Systematic Position ◽  
Diatom Species ◽  
Valve Morphology ◽  
Zoige Wetland ◽  
Scanning Electron

A new diatom species, Neidiomorpha sichuaniana sp. nov., is described from Zoigê Wetland, China. The morphology of N. sichuaniana is documented by light and scanning electron microscope and discussed in detail, including a comparison with the two other species in the genus Neidiomorpha also found in Zoigê. Neidiomorpha sichuaniana has a smaller central area and smaller central constriction than N. binodiformis and less apiculate ends than N. binodis. We comment on the systematic position of Neidiomorpha based on the morphology of these three species.

Encyonopsis neerlandica, a new freshwater diatom species (Bacillariophyta) from moorland pools in The Netherlands

Phytotaxa ◽  
2012 ◽  
Vol 66 (1) ◽  
pp. 43
Author(s):  
BART VAN DE VIJVER ◽  
GEURT L. VERWEIJ ◽  
JAKO VAN DER WAL ◽  
ADRIENNE MERTENS
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
The Netherlands ◽  
Similar Species ◽  
Diatom Species ◽  
Weakly Convex ◽  
Valve Margin ◽  
Moorland Pools ◽  
Scanning Electron ◽  
Freshwater Diatom

A new cymbelloid diatom species, Encyonopsis neerlandica sp. nov., is described from several moorland pools from The Netherlands. The new species belongs to the complex of species around E. microcephala. Based on light and detailed scanning electron microscopy, the morphology of Encyonopsis neerlandica is discussed and compared to similar species from this complex. Encyonopsis neerlandica is characterized by its rather large valve dimensions, the narrowly to clearly lanceolate valve outline with convex to weakly convex margins and rostrate to subcapitate apices. The distal raphe fissures are ventrally deflected. There is a clear difference between the rounded areolae near the valve margin and the transapically elongated areolae near the axial area.Notes on the ecology of the species are included.

Pinnularia baetica sp. nov. (Bacillarophyceae): Comparison with other panduriform species in the Mediterranean area

Phytotaxa ◽  
2020 ◽  
Vol 435 (2) ◽  
pp. 85-100
Author(s):  
DAVID FERNÁNDEZ MORENO ◽  
ANA T. LUÍS ◽  
DANIJELA VIDAKOVIC ◽  
ZLATKO LEVKOV ◽  
PEDRO M. SÁNCHEZ CASTILLO
Keyword(s):  
Electron Microscopy ◽  
Mediterranean Area ◽  
Morphological Characters ◽  
The Other ◽  
Diatom Species ◽  
Valve Size ◽  
The Mediterranean ◽  
Locus Classicus ◽  
Scanning Electron ◽  
Freshwater Diatom

A new freshwater diatom species Pinnularia baetica sp. nov. is described from two different ponds from the Mediterranean area: Andalucia (South of Spain) and Lake Livadičko, Serbia. The species is described by observations under light (LM) and scanning electron microscopy (SEM). The most similar taxa to P. baetica are P. atlasii and P. infirma that were studied through material obtained in lagoons of northern Morocco (locus classicus of P. atlasi). Although there are similarities in the morphological characters of the frustule, it was possible to verify both through LM and SEM observations, clear differences between P. baetica and the latter two taxa: Pinnularia baetica has a panduriform shape more pronounced than P. infirma and larger valve size. On the other hand, the absence of spines in P. baetica, the more convergent striation at the poles and a slightly wider valve are the main differences with P. atlasi. This paper documents the distribution areas of P. baetica in calcareous systems of oligotrophic mid-mountain ponds of Spain and Serbia.

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