Cryptogamie Algologie最新文献

{"title":"A New Species of Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) from Wet Soils in Southern Vietnam","authors":"E. Kezlya, A. Glushchenko, J. Kociolek, Y. Maltsev, S. Genkal, M. Kulikovskiy","doi":"10.5252/cryptogamie-algologie2022v43a11","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a11","url":null,"abstract":"ABSTRACT A new diatom species of the genus Placoneis Mereschkowsky is described on the basis of molecular and morphological data. The new species, Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov., is morphologically characterized by slightly asymmetrical valves along the apical axis based on light and scanning electron microscopy of the exterior and interior of valves. Molecular data, which are derived from live cells, are used for phylogenetic reconstruction based on 18S V4 rDNA and rbcL gene markers of taxa from the genus Placoneis and other diatoms in the order Cymbellales D.G.Mann. Comparisons with other morphologically and molecularly closely-related species are given. RÉSUMÉ Une espèce nouvelle de Placoneis Mereschkowsky (Bacillariophyceae: Cymbellales) des sols humides du sud du Vietnam. Une espèce nouvelle de diatomée du genre Placoneis Mereschkowsky est décrite sur la base de données moléculaires et morphologiques. La nouvelle espèce, Placoneis asymmetricus Glushchenko, Kezlya, Kulikovskiy & Kociolek, sp. nov., se caractérise morphologiquement par des valves légèrement asymétriques le long de l'axe apical selon nos observations au microscope optique et électronique à balayage de l'extérieur et de l'intérieur des valves. Les données moléculaires, extraites de cellules vivantes, sont utilisées pour la reconstruction phylogénétique basée sur l'ADNr 18S V4 et les marqueurs génétiques rbcL des taxons du genre Placoneis et d'autres diatomées de l'ordre des Cymbellales D.G.Mann. Des comparaisons avec d'autres espèces morphologiquement et moléculairement proches sont données.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81827895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Study of the Morphology and Distribution of four Achnanthidium Kütz. Species (Bacillariophyta), Implications for Ecological Status Assessment, and Description of two New European Species","authors":"I. Jüttner, P. Hamilton, C. E. Wetzel, Bart Van de Vijver, L. King, M. Kelly, David M. Williams, L. Ector","doi":"10.5252/cryptogamie-algologie2022v43a10","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a10","url":null,"abstract":"ABSTRACT Six species of the genus Achnanthidium Kütz. with straight terminal raphe fissures including Achnanthidium caledonicum (Lange-Bert.) Lange-Bert., A. sieminskae Witkowski, Kulikowskiy & Riaux-Gob., Achnanthidium neomicrocephalum Lange-Bert. & F.Staab and Achnanthidium minutissimum (Kütz.) Czarn. were studied using light and scanning electron microscopy, and shape analysis. The type of Achnanthes microcephala f. scotica J.R.Carter (synonym: A. caledonica) and a population of A. neomicrocephalum from its type locality were investigated. Two new species, Achnanthidium tirolense sp. nov. and Achnanthidium lacuslustense sp. nov., found in two oligotrophic lakes in Germany and Austria, were described. Achnanthidium tirolense sp. nov. is distinguished by its rhombic-lanceolate valves with a slightly inflated valve centre and an acute-angled fascia on the raphe valve, and Achnanthidium lacuslustense sp. nov. by its large capitate poles, broad fascia on the raphe valve and strongly curved frustules. The distribution of A. caledonicum, A. sieminskae, A. neomicrocephalum and A. minutissimum in relation to land use and their species associations were investigated in 52 rivers, streams, and lakes of Scotland. Achnanthidium sieminskae, A. caledonicum, and A. neomicrocephalum were found in areas with low human impact where seminatural vegetation was dominant. The latter two species are typical in mountainous areas. In contrast, A. minutissimum sensu stricto was found in locations where human impact was greater. Although further data are required to determine which environmental variables underlie these distributions, our results suggest that the treatment of these species should be revised in ecological status assessments, and taxa aggregated under A. minutissimum sensu lato should be distinguished in ecological and biogeographical studies. RÉSUMÉ Étude de la morphologie et de la distribution de quatre espèces d'Achnanthidium Kütz. (Bacillariophyta), implications pour l'évaluation de l'état écologique, et description de deux espèces nouvelles européennes. Six espèces du genre Achnanthidium Kütz. à fissure terminale droite du raphé incluant Achnanthidium caledonicum (Lange-Bert.) Lange-Bert., A. sieminskae Witkowski, Kulikovskiy & Riaux-Gob., A. neomicrocephalum Lange-Bert. & F.Staab et A. minutissimum (Kütz.) Czarn. ont été étudiées en utilisant microscopie optique, microscopie électronique à balayage et analyse de forme. Le type d'Achnanthes microcephala f. scotica J.R.Carter (synonyme: A. caledonica) et une population d'A. neomicrocephalum provenant de sa localité type ont été étudiés. Deux espèces nouvelles, Achnanthidium tirolense sp. nov. et A. lacuslustense sp. nov., observées dans deux lacs oligotrophes en Allemagne et Autriche, ont été décrites. Achnanthidium tirolense sp. nov. se distingue des autres espèces du genre par ses valves rhombiques-lancéolées avec un centre valvaire légèrement gonflé et un fascia à angle aigu sur la valve du raphé, e","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75860086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trebouxia maresiae sp. nov. (Trebouxiophyceae, Chlorophyta), a New Lichenized Species of Microalga Found in Coastal Environments","authors":"I. Garrido‐Benavent, S. Chiva, C. Bordenave, A. Molins, E. Barreno","doi":"10.5252/cryptogamie-algologie2022v43a9","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a9","url":null,"abstract":"ABSTRACT Coccoid microalgae of the genus Trebouxia Puymaly are by far the most prevalent among the various species involved in lichen symbioses. However, their taxonomic knowledge is rather scarce compared to that of lichenized fungi. In the present work, a taxonomic study integrating diverse techniques (phylogenetics, light, confocal and transmission electron microscopies) is carried out to describe Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. This species widely associates with the red-listed lichenized fungus Seirophora villosa (Ach.) Frödén but also with species of the genus Ramalina Ach., both occurring in coastal environments in the western Mediterranean and the Cape Verdean islands. This microalga is circumscribed to Trebouxia clade A and is closely related to T. decolorans Ahmadjian. It is characterized by the cell size being up to 15 µm in diam., the crenulate chloroplasts, and the structure of pyrenoids, which in cultured cells fits well with the crenulata-type, with long branched tubules meandering through the pyrenoid matrix, whereas in the lichenized state it acquires a hybrid structure (maresiae-type), characterized by the periphery of the pyrenoid being rather gigantea-type, with thylakoid membranes forming short, branched tubules. With the present work, the taxonomy of the genus Trebouxia moves a step forward towards more accurately characterizing species in lichen microalgae which is a prerequisite for future, more complex studies on speciation, co-evolution and selectivity. RÉSUMÉ Trebouxia maresiae sp. nov. (Trebouxiophyceae, Chlorophyta), une espèce nouvelle de microalgue lichénisée présente dans les environnements côtiers. Les microalgues cocoïdes du genre Trebouxia Puymaly sont les plus répandues parmi les différentes espèces associées aux symbioses lichéniques. Cependant, la connaissance taxonomique de ces espèces est plutôt lacunaire par rapport à celle des champignons lichénisés. Dans ce travail, une étude taxonomique intégrant diverses techniques (phylogénétique, microscopies optique, confocale et électronique à transmission) a été réalisée pour décrire Trebouxia maresiae Garrido-Benavent, Chiva & Barreno, sp. nov. Cette espèce s'associe principalement au champignon lichénisé Seirophora villosa (Ach.) Frödén, figurant sur la liste rouge, mais aussi avec des espèces du genre Ramalina Ach., tous deux présents dans les environnements côtiers de la Méditerranée occidentale et des îles du Cap-Vert. Cette microalgue est circonscrite au clade A de Trebouxia, et démontre une relation étroite avec T. decolorans Ahmadjian. Elle se caractérise par la taille de ses cellules (jusqu'à 15 µm de diamètre), ses chloroplastes crénelés et la structure de ses pyrénoïdes qui, dans les cellules cultivées, correspond bien au crenulata-type, avec de longs tubules ramifiés serpentant dans la matrice du pyrénoïde, alors qu'à l'état lichénisé, elle adopte une structure hybride (maresiae-type), caractérisée par la périphérie du py","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73056002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rindifilum ramosum gen. nov., sp. nov., a New Freshwater Genus within the Ulvales (Ulvophyceae, Chlorophyta)","authors":"V. Malavasi, M. Klimešová, A. Lukešová, P. Škaloud","doi":"10.5252/cryptogamie-algologie2022v43a8","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a8","url":null,"abstract":"ABSTRACT The present paper provides a phylogenetic and morphological study of two strains that turn out to represent a new genus and species, Rindifilum ramosum gen. nov., sp. nov., within the family Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. grows in association with the lichenized ascomycetes genus Verrucaria Schrader. Phylogenetic reconstructions based on the rbcL, 18S rRNA and tufA genes showed that the investigated strains belonged to a lineage distinct from those sequenced so far. Moreover, comparisons based on morphological observations revealed no differences between the two strains. The newly genus Rindifilum gen. nov. exhibits a unique combination of morphological features, as the “pear-shaped” cells that develop directly into a “hammer-shaped filament”, making it distinct from all other green algae described so far. RÉSUMÉ Rindifilum ramosum gen. nov., sp. nov., un nouveau genre d'eau douce au sein des Ulvales (Ulvophyceae, Chlorophyta). Le présent article fournit une étude phylogénétique et morphologique de deux souches qui s'avèrent représenter un genre nouveau et une espèce nouvelle, Rindifilum ramosum gen. nov., sp. nov., au sein de la famille des Ctenocladiaceae (Ulvales). Rindifilum ramosum gen. nov., sp. nov. se développe en association avec le genre Verrucaria Schrader, un ascomycète lichénisé. Les reconstructions phylogénétiques basées sur les gènes rbcL, 18S rRNA et tufA ont montré que les souches étudiées appartiennent à une lignée distincte de celles séquencées jusqu'à présent. De plus, les comparaisons basées sur les observations morphologiques n'ont révélé aucune différence entre les deux souches. Le nouveau genre Rindifilum gen. nov. présente une combinaison unique de caractéristiques morphologiques, comme les cellules en forme de « poire » qui se développent directement en un « filament en forme de marteau », ce qui le distingue de toutes les autres algues vertes décrites jusqu'à présent.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85428551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DNA Analysis of the Lectotype Specimen of Ulva nematoidea Bory (Ulvaceae, Chlorophyta) Determines Its Synonymy with Ulva lactuca L.","authors":"Jeffery R. Hughey, P. Gabrielson","doi":"10.5252/cryptogamie-algologie2022v43a7","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a7","url":null,"abstract":"ABSTRACT Ulva nematoidea Bory is a currently accepted species distributed in the south eastern Pacific Ocean from Mexico to Chile. Its identity however remains unknown because no DNA sequences have been obtained from the type specimen. To determine its identity and taxonomic status, we performed high-throughput sequencing on a fragment of the lectotype specimen of U. nematoidea. Genetic analyses of the rbcL, tufA and nuclear ITS DNA found that U. nematoidea is identical in sequence to U. lactuca L. These results indicate that U. nematoidea is a synonym of U. lactuca and further highlight the need for sequencing additional type specimens of Ulva L. RÉSUMÉ L'analyse de l'ADN du spécimen lectotype d'Ulva nematoidea Bory (Ulvaceae, Chlorophyta) détermine sa synonymie avec Ulva lactuca L. Ulva nematoidea Bory est une espèce actuellement acceptée répartie dans le sud-est de l'océan Pacifique, du Mexique au Chili. Son identité reste cependant inconnue car aucune séquence d'ADN n'a été obtenue à partir du spécimen type. Pour déterminer son identité et son statut taxonomique, nous avons effectué un séquençage à haut débit sur un fragment du spécimen lectotype d'U. nematoidea. Les analyses génétiques de l'ADN rbcL, tufA et ITS nucléaire ont révélé que U. nematoidea a une séquence identique à U. lactuca L. Ces résultats indiquent que U. nematoidea est un synonyme de U. lactuca et soulignent davantage la nécessité de séquencer des spécimens types supplémentaires d'Ulva L.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79209600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Homogeneity of Photosynthetic Features in Canopy-Forming Macroalgae of The Order Fucales from Shallow and Sheltered Environments","authors":"E. Ballesteros, N. Sant","doi":"10.5252/cryptogamie-algologie2022v43a6","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a6","url":null,"abstract":"ABSTRACT Photosynthetic features of different canopy-forming macroalgae of the order Fucales (Phaeophyceae) living in shallow and sheltered environments show a high homogeneity when compared with other morphologically similar species living across a depth gradient. Photosynthesis at saturation (situated around 5 mg O2 gAFDM 1 h1) and photosynthetic efficiency [around 0.4 mg O2·m2 s (µmol photon·gAFDM·h)-1] are relatively low, while dark respiration (around 1 mg O2 gAFDM 1 h1) and light at compensation (around 24 µmol photon·m-2·s-1) are relatively high, as it corresponds to the characteristics of “sun” plants. C:N and C:P ratios suggest a strong nutrient limitation for growth and photosynthesis, in agreement with the low dissolved nutrient levels usually found in shallow Mediterranean waters. Homogeneity in photosynthetic features points to a good local adaptation of the different species to the prevailing light conditions but opens the question of which are the factors allowing the coexistence of different species of Fucales in sheltered and shallow Mediterranean environments.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85681405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-Phase Medium – A New Approach to Microbiological Culturing","authors":"K. Wołowski, W. Spisak, A. Chlebicki, Mateusz Szar, J. Kozak, L. Śliwa","doi":"10.5252/cryptogamie-algologie2022v43a5","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a5","url":null,"abstract":"ABSTRACT We tested a new two-phase culture medium for culturing microorganisms, in particular algae and fungi. In media composed of mixed gel and solid phases of granite, basalt, sandstone, limestone and sodium glass, we observed the growth of selected species inhabiting the boundaries of the gel medium with the solid phase. The species used were Klebsormidium dissectum (F.Gay) H.Ettl & Gärtner, Vischeria polyphem (Pitschmann) Kryvenda, Rybalka, Wolf & Friedl and Muriella decolor Vischer (algae); and Aspergillus tubingensis R.Mosseray, Aureobasidium pullulans (de Bary) G.Arnaud, Chaetomium globosum Kunze and Penicillium sp. Link (fungi). In the six-weeks period of parallel cultures, the growth rate of the algae inoculum in two-phase media was twice that observed in the control culture (gel medium). The algae also maintained high viability in the new medium.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89971365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Nitzschia Hassall Species (Bacillariaceae, Bacillariophyta) from Saline Ponds in Serbia","authors":"D. Vidaković, L. Ector, C. E. Wetzel, J. Krizmanić, B. Gavrilović, B. Dojčinović, Miloš Ćirić","doi":"10.5252/cryptogamie-algologie2022v43a4","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a4","url":null,"abstract":"ABSTRACT In the present study, a new species, Nitzschia haloserbica Vidaković, Ector, C.E.Wetzel & Krizmanić, sp. nov., is described from alkaline saline ponds and channels from Vojvodina Province (Serbia). In 2019 the new species was found in four saline ponds: Bela Bara, Čoka Kopovo, Velika Rusanda and Slatina. The same species was recorded four years ago in saline lakes in Hungary, but the authors listed it as Nitzschia sp. 2. The sigmoid valve outline of the new Nitzschia Hassall species is similar to N. austriaca Hust. but differs in striae density and fibulae distribution. In N. haloserbica sp. nov. the transapical striae are so dense that they are not visible in light microscopy. Both species have fibulae that are quite regularly distributed along the raphe canal, but in N. austriaca the central two fibulae are more widely spaced, reflecting the presence of central raphe endings, which are absent in N. haloserbica sp. nov. At the type locality (Bela Bara) both species were found with relative abundances of 94.93 % for N. haloserbica sp. nov. and 1.21 % for N. austriaca (of the 400 valves counting per slide). The valve morphology, ultrastructure and autecology of the new species are discussed and compared with morphologically similar taxa.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87138963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Culture Collection of Cyanobacteria and Microalgae at the French National Museum of Natural History: A Century Old But Still Alive and Kicking! Including in Memoriam: Professor Alain Couté","authors":"S. Hamlaoui, C. Yéprémian, C. Duval, Benjamin Marie, C. Djédiat, B. Piquet, C. Bernard, S. Duperron","doi":"10.5252/cryptogamie-algologie2022v43a3","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a3","url":null,"abstract":"ABSTRACT Cyanobacteria and eukaryotic microalgae are key players in life on Earth. They have adapted to a broad diversity of ecosystems, and ensure roughly half of the primary production. Their detailed study greatly benefits from isolated strains, deposited and maintained ex situ in culture collections, and made available to the scientific community along with expert knowledge. Established in the late 1920s, the culture collection of cyanobacteria and microalgae at the French National Museum of Natural History (MNHN) now comprises over 1350 non-axenic live strains isolated mostly from freshwater ecosystems in France. As a research-oriented collection, it contributes to biodiversity, taxonomy, genomics, and bioactive compounds research. Notably, the collection contains multiple strains of various genera of bloom-forming cyanobacteria that are of ecological concern, some of which produce cyanotoxins. Novel strategies for strain identification, conservation and accessibility are being implemented to provide an up-to-date resource to the community. Through research, expertise for ecotoxicology, partnerships with the industry or with artists, the MNHN collection appears at both a repository of biodiversity as well as resource for life sciences.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80794494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synedropsis abuflosensis sp. nov., a New Araphid Diatom (Bacillariophyceae) from the Shatt Al-Arab River, Southern Iraq","authors":"Adil Y. AL-HANDAL, Maitham A. Al-Shaheen, Rehab N. AL-SAEDY, A. Wulff","doi":"10.5252/cryptogamie-algologie2022v43a2","DOIUrl":"https://doi.org/10.5252/cryptogamie-algologie2022v43a2","url":null,"abstract":"ABSTRACT Synedropsis abuflosensis sp. nov. is the third species of the genus recorded from a sub-tropical brackish water habitat as opposed to a polar distribution. This species is differentiated from others in the genus by having a different number of slits in the apical slit field at opposite ends of the valve (i.e., 4 at the end possessing a rimoportula versus 5 at the end lacking a rimoportula), an apically oriented rimoportula and 3-4 non-porous cingular bands. Its habitat is different than that of all known Synedropsis Hasle, Medlin & Syvertsen species as it is either benthic or epiphytic in algal mats rather than planktonic or associated with sea ice. The new species was found in waters with a conductivity of 7.1 µS cm-1 (salinity 3.3 psu) and a temperature of 33 °C. Morphological characters of the new species are described based on light and scanning electron microscopy observations. A comparison of S. abuflosensis sp. nov. with morphologically similar species is provided.","PeriodicalId":51000,"journal":{"name":"Cryptogamie Algologie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89401060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}