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Fabiola Cruces - One of the best experts on this subject based on the ideXlab platform.
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Fragilaria striatula lyngbye a little known marine diatom from chile
Gayana Botánica; Vol. 59 Núm. 1 (2002); 35-41, 2021Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Although the marine species Fragilaria striatula Lyngbye is widely distributed in the North Atlantic and the Arctic, has rarely been reported from the southeastern Pacific coasts of Chile. Using material deposited at the Diatom Collection of the University of Concepcion, Chile, the morphological features of this taxon were observed and recorded under light and electron microscopes. The specimens studied were collected between 20o13’S and 53o39’S, revealing a wide distribution along the Chilean coast, especially as an epiphyte on larger algae.
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Fragilaria striatula lyngbye una diatomea marina muy poco conocida para chile Fragilaria striatula lyngbye a little known marine diatom from chile
2002Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Departamento de Botanica, Universidad de Concepcion,Casilla 160-C, Concepcion, Chile. E-mail:privera@udec.clRESUMENAunque la especie marina Fragilaria striatula Lyngbyeesta ampliamente distribuida en aguas del Atlantico Nortey del Artico, es muy poco conocida para las aguas delPacifico Sur Oriental de Chile. Sobre la base de materialdepositado en la Coleccion Diatomologica de laUniversidad de Concepcion, Chile, se observo yfotografio las caracteristicas morfologicas de este taxonen los microscopios fotonico y electronicos. Losespecimenes estudiados fueron recolectados entre los20o13’S y los 53o39’S, revelando una gran distribucion alo largo de la costa de Chile, especialmente como epifitade algas superiores.P
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Fragilaria striatula lyngbye una diatomea marina muy poco conocida para chile
Gayana Botanica, 2002Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Aunque la especie marina Fragilaria striatula Lyngbye esta ampliamente distribuida en aguas del Atlantico Norte y del Artico, es muy poco conocida para las aguas del Pacifico Sur Oriental de Chile. Sobre la base de material depositado en la Coleccion Diatomologica de la Universidad de Concepcion, Chile, se observo y fotografio las caracteristicas morfologicas de este taxon en los microscopios fotonico y electronicos. Los especimenes estudiados fueron recolectados entre los 20°13'S y los 53°39'S, revelando una gran distribucion a lo largo de la costa de Chile, especialmente como epifita de algas superiores
Fabiola Cruces L - One of the best experts on this subject based on the ideXlab platform.
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Fragilaria capucina desm var mesogongyla frenguelli una diatomea presente en la zona norte de la cordillera de los andes chile con comentarios sobre la variabilidad del numero de procesos labiados en algunos generos arafidales
Gayana Botanica, 2008Co-Authors: Patricio Rivera R, Fabiola Cruces LAbstract:La diatomeaFragilaria capucina var. mesogongyla, descrita originalmente por Frenguelli desde Calama, Chile (22°28' S, 68°56'W), fue encontrada en una muestra recolectada en el rio Lauca, a gran altitud en el norte de Chile (18°30'S, 69°16'W). Por primera vez este taxon se estudia mediante tecnicas de microscopia electronica (SEM). Siendo muy raro para el genero Fragilaria, esta variedad presenta un proceso labiado en cada polo valvar (dos por valva). Se entrega una diagnosis corregida, y fotografias ilustran las principales caracteristicas morfologicas del taxon.
Patricio Rivera - One of the best experts on this subject based on the ideXlab platform.
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Fragilaria striatula lyngbye a little known marine diatom from chile
Gayana Botánica; Vol. 59 Núm. 1 (2002); 35-41, 2021Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Although the marine species Fragilaria striatula Lyngbye is widely distributed in the North Atlantic and the Arctic, has rarely been reported from the southeastern Pacific coasts of Chile. Using material deposited at the Diatom Collection of the University of Concepcion, Chile, the morphological features of this taxon were observed and recorded under light and electron microscopes. The specimens studied were collected between 20o13’S and 53o39’S, revealing a wide distribution along the Chilean coast, especially as an epiphyte on larger algae.
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Fragilaria striatula lyngbye una diatomea marina muy poco conocida para chile Fragilaria striatula lyngbye a little known marine diatom from chile
2002Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Departamento de Botanica, Universidad de Concepcion,Casilla 160-C, Concepcion, Chile. E-mail:privera@udec.clRESUMENAunque la especie marina Fragilaria striatula Lyngbyeesta ampliamente distribuida en aguas del Atlantico Nortey del Artico, es muy poco conocida para las aguas delPacifico Sur Oriental de Chile. Sobre la base de materialdepositado en la Coleccion Diatomologica de laUniversidad de Concepcion, Chile, se observo yfotografio las caracteristicas morfologicas de este taxonen los microscopios fotonico y electronicos. Losespecimenes estudiados fueron recolectados entre los20o13’S y los 53o39’S, revelando una gran distribucion alo largo de la costa de Chile, especialmente como epifitade algas superiores.P
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Fragilaria striatula lyngbye una diatomea marina muy poco conocida para chile
Gayana Botanica, 2002Co-Authors: Patricio Rivera, Fabiola CrucesAbstract:Aunque la especie marina Fragilaria striatula Lyngbye esta ampliamente distribuida en aguas del Atlantico Norte y del Artico, es muy poco conocida para las aguas del Pacifico Sur Oriental de Chile. Sobre la base de material depositado en la Coleccion Diatomologica de la Universidad de Concepcion, Chile, se observo y fotografio las caracteristicas morfologicas de este taxon en los microscopios fotonico y electronicos. Los especimenes estudiados fueron recolectados entre los 20°13'S y los 53°39'S, revelando una gran distribucion a lo largo de la costa de Chile, especialmente como epifita de algas superiores
David M. Williams - One of the best experts on this subject based on the ideXlab platform.
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A re-description of Fragilaria fonticola Hustedt and its varieties, with three new combinations and one new species from India
Phytotaxa, 2020Co-Authors: Anbukkarasu Vigneshwaran, Carlos E. Wetzel, David M. Williams, Balasubramanian KarthickAbstract:Tabularia (Kutzing) 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.
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description of a new pseudostaurosira based on Fragilaria virescens f parva from erbario crittogamico italiano
Botany Letters, 2020Co-Authors: David M. Williams, Carlos E. WetzelAbstract:Normally thought of as a cosmopolitan species, Fragilariforma virescens (Ralfs) D.M.Williams & Round has been recorded widely, its occurrence noted in many regional floras. Since its description in...
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re typification of Fragilaria subconstricta and f tenuistriata and a correction for tuji williams 2008 diat res 23 503 510
Diatom Research, 2019Co-Authors: Akihiro Tuji, David M. WilliamsAbstract:In a previous publication, we provided details on the typification of Fragilaria subconstricta Ostrup and Fragilaria tenuistriata Ostrup (Tuji & Williams 2008). We inadvertently switched our reprod...
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Eunotia enigmatica sp nov., a new planktonic diatom from Brazil and the transfer of Fragilaria braunii HUSTEDT to the genus Peronia (Bacillariophyceae)
Fottea, 2017Co-Authors: Lívia F. Costa, Luc Ector, Carlos E. Wetzel, David M. Williams, Denise C. BicudoAbstract:Eunotia is a diatom genus characterized by a short raphe system restricted to both valve poles and by the presence of rimoportulae. As part of a survey examining the genus, Eunotia enigmatica sp. nov. is described from ultra oligo- to oligotrophic and slightly acidic reservoirs in Sao Paulo State, southeast Brazil. The species is unusual in having a short distinct raphe, and a 'fragilarioid' appearance with long cells and marginal spines. It was commonly found in the planktonic community as well as on sediments of the studied reservoirs. It seems to be adapted to an open water existence, and is similar to E. croatana and E. pseudoFragilaria both described from North America. Additionally, type material of another similar looking species, Fragilaria braunii, was analysed using light and scanning electron microscopy and a new combination is proposed for it in the genus Peronia.
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fragilariforma hajosiae re description and revision of pantocsek s species diatoma fossile bacillariophyta
Phytotaxa, 2016Co-Authors: David M. Williams, Kristina BuczkoAbstract:Fragilariforma Hajosiae is re-described from Pantocsek’s specimens of Diatoma fossile ; these specimens are from Demend (Demandice, Slovakia). Nomenclatural issues are examined and clarified as the name Fragilaria fossilis has previously been invalidly used by Hajos (1973a) and the combination Fragilariforma fossilis (Pant.) Tanaka unavailable thus making it necessary to create a new name to effect the transfer of Pantocsek’s Diatoma fossile to Fragilariforma .
Luc Ector - One of the best experts on this subject based on the ideXlab platform.
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analysis of the type material of synedra perminuta bacillariophyceae with the description of two new Fragilaria species from sweden
Phytotaxa, 2020Co-Authors: Bart Van De Vijver, Luc EctorAbstract:During a revision of the genus Fragilaria in Europe, two unknown Fragilaria taxa were observed in Erken Lake, Sweden, that showed some resemblance to Fragilaria perminuta, a species described in the nineteenth century from the Great Lakes in the United States. The type material of Synedra perminuta from Lake Erie, U.S.A. (Grunow sample 2592) was analysed. Detailed morphological analysis, using both light and scanning electron microscope observations and comparison with the type material, showed that both taxa from Sweden should be described as new species: Fragilaria goeyersiana sp. nov. and F. vandevondeliana sp. nov. The separation of the two taxa is based on valve outline, shape of the apices and stria density. Comparisons are made with similar taxa and brief notes on their ecology are added.
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Eunotia enigmatica sp nov., a new planktonic diatom from Brazil and the transfer of Fragilaria braunii HUSTEDT to the genus Peronia (Bacillariophyceae)
Fottea, 2017Co-Authors: Lívia F. Costa, Luc Ector, Carlos E. Wetzel, David M. Williams, Denise C. BicudoAbstract:Eunotia is a diatom genus characterized by a short raphe system restricted to both valve poles and by the presence of rimoportulae. As part of a survey examining the genus, Eunotia enigmatica sp. nov. is described from ultra oligo- to oligotrophic and slightly acidic reservoirs in Sao Paulo State, southeast Brazil. The species is unusual in having a short distinct raphe, and a 'fragilarioid' appearance with long cells and marginal spines. It was commonly found in the planktonic community as well as on sediments of the studied reservoirs. It seems to be adapted to an open water existence, and is similar to E. croatana and E. pseudoFragilaria both described from North America. Additionally, type material of another similar looking species, Fragilaria braunii, was analysed using light and scanning electron microscopy and a new combination is proposed for it in the genus Peronia.
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taxonomy and ecology of Fragilaria billingsii sp nov and analysis of type material of synedra rumpens var fusa Fragilariaceae bacillariophyta from brazil
Phytotaxa, 2016Co-Authors: Simone Wengrat, Eduardo A. Morales, Luc Ector, Carlos E. Wetzel, Pryscilla D Almeida, Denise C. BicudoAbstract:Synedra rumpens var. fusa was originally described by Patrick, but there are only a few subsequent records of this variety in the literature. Analysis of samples from Brazilian reservoirs containing a morphologically similar taxon led us to the analysis of the type material of S . rumpens var. fusa , performed using light (LM) and scanning electron microscopy (SEM). In the present manuscript, an amendment to the description of the var. fusa is made and its transfer to the genus Fragilaria as F . fusa comb . et stat . nov . is proposed. Moreover, Fragilaria billingsii sp . nov . is described from a large multipurpose reservoir from the State of Sao Paulo, Brazil. Comparative discussions with morphologically related taxa found in the literature are presented. Regarding ecological preferences, the new species was found living in slightly acidic and meso-eutrophic waters.
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two new diatoms in the genus Fragilaria lyngbye fragilariophyceae from tropical reservoirs in brazil and comparison with type material of f tenera
Phytotaxa, 2016Co-Authors: Pryscilla D Almeida, Eduardo A. Morales, Luc Ector, Carlos E. Wetzel, Denise C. BicudoAbstract:Two new diatom species, Fragilaria neotropica sp . nov . and F . spectra sp . nov ., from six reservoirs with different trophic status in the Alto Tiete River Basin, Sao Paulo, Brazil, are described. Descriptions are based on light (LM) and scanning electron microscopy (SEM) data revealing that both taxa have distinctive features that separate them from each other and from other taxa currently in Fragilaria . Fragilaria neotropica has high stria density, broader (sometimes deformed) central area, and capitate (often deflected) apices. This species was found in high abundance as part of the phytoplankton, periphyton and surface sediments in mesotrophic reservoirs. On the other hand, F . spectra has indistinct striae (not clearly seen in LM), wide sternum, two rimoportulae per valve and lacks spines. This taxon was abundant in the phytoplankton and periphyton of oligotrophic to mesotrophic reservoirs. A discussion of morphological and ecological aspects in the light of available literature is presented, as well as a morphological comparison based on LM and SEM analysis of the original material of F . tenera .
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taxonomy and ecology of Fragilaria microvaucheriae sp nov and comparison with the type materials of f uliginosa and f vaucheriae
Cryptogamie Algologie, 2015Co-Authors: Carlos E. Wetzel, Luc EctorAbstract:Abstract A new diatom species from freshwater environments in France is described. Fragilaria microvaucheriae sp. nov. is illustrated and discussed based on populations from the Loire-Brittany basin and compared with the original (type) material of Fragilaria vaucheriae (Kutz.) J.B.Petersen (= Exilaria vaucheriae Kutz.) from Germany and Fragilaria uliginosa Kulikowskiy et al., recently described from a peat bog in Mongolia. Additional populations of Fragilaria pectinalis (O.F.Mull.) Lyngb. from the Rhone Alpes region (France) are also investigated in detail including its environmental preferences in order to compare with the new species. Fragilaria microvaucheriae is similar to F. vaucheriae but present smaller cell dimensions and higher density of striae. It occurs in slight acidic waters. The new species has been identified in the past as F. vaucheriae, Fragilaria capucina sensu auct., Fragilaria austriaca (Grunow) Lange-Bert. or Fragilaria pectinalis. The morphology of the new species and similar taxa ...
