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Moss-associated diatoms from Malaysian montane cloud forest with a description of two new species Diatom Res. (IF 1.8) Pub Date : 2024-02-07 Mateusz Rybak, Łukasz Peszek, Małgorzata Bąk, Nurul Shahida Redzuan
Although tropical montane cloud forests (TMCFs) occupy less than half of a percent of the Earth’s land surface, they are the most species-rich and species-dense ecosystems worldwide. Despite numero...
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Assessment of the ecological status of large lowland rivers (Sava and Tisa, Serbia) based on digital microscopic investigation of the diatom communities Diatom Res. (IF 1.8) Pub Date : 2024-02-07 Danijela Vidaković, Ntambwe Albert Serge Mayombo, Andrea Burfeid Castellanos, Michael Kloster, Bank Beszteri
Large lowland rivers represent an important type of ecosystem that has been under a constant anthropogenic influence (industry, thermal power plants, untreated communal water, and agriculture) for ...
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Notes on the diatom collection of the Natural History Museum, London (BM) VIII: the types of Arachnoidiscus in Brown’s monograph (Brown 1933) Diatom Res. (IF 1.8) Pub Date : 2024-01-17 David M. Williams
Nicholas Edward Brown, a botanist primarily interested in the African flowering plant flora, was also an active member of the Quekett Microscopical Club. In 1933, he published a monograph on the ge...
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Three new cymbelloid species in the genera Cymbella, Cymbopleura and Delicatophycus from the mineral spring Crvena Voda near Skopje, Republic of North Macedonia Diatom Res. (IF 1.8) Pub Date : 2023-12-12 Zlatko Levkov, Dušica Zaova, Ingrid Jüttner
Mineral springs are unique habitats frequently inhabited by specific diatom species with restricted distributions. In the mineral spring Crvena Voda near Skopje, three cymbelloid taxa were observed...
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Diatoms of the northeastern Gulf of Mexico: Vallithidium (Achnanthales: Achnanthidiaceae), a new monoraphid genus based on Navicula marginulata Cleve Diatom Res. (IF 1.8) Pub Date : 2023-12-12 James A. Nienow, Akshinthala K. S. K. Prasad
While conducting a systematic investigation of phytoplankton assemblages in the northeastern Gulf of Mexico (GOM) in the aftermath of the Deepwater Horizon blowout we took the opportunity to collec...
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The conspecificity of Aulacoseira konstantinovii and Praecyclostephanos boengchhmariensis with comments on the genus Praecyclostephanos Diatom Res. (IF 1.8) Pub Date : 2023-12-12 Sergey I. Genkal, Anton M. Glushchenko, Maria A. Gololobova
The centric diatom species Aulacoseira konstantinovii was described from Lake Tonlé Sap (Cambodia) but was erroneously assigned to the genus Aulacoseira. Subsequently, based on a unique set of morp...
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Systematic reappraisal of the diminutive Amphora thumensis and the transfer of Halamphora parathumensis to the genus Amphora Diatom Res. (IF 1.8) Pub Date : 2023-12-12 Joshua G. Stepanek, Tate E. Carlson, Lauren E. Rumley, Matthew L. Julius
Since its description the amphoroid diatom Amphora thumensis has confounded simple taxonomic classification having been assigned to Amphora, Cymbella, and now Halamphora. Taxonomic ambiguity around...
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Filling reference libraries with diatom environmental sequences: strengths and weaknesses Diatom Res. (IF 1.8) Pub Date : 2023-09-12 Hristina Kochoska, Cécile Chardon, Teofana Chonova, François Keck, Lenaïg Kermarrec, Floriane Larras, Estelle Lefrancois, Sinziana F. Rivera, Kálmán Tapolczai, Valentin Vasselon, Zlatko Levkov, Frédéric Rimet
Diatom species identification with DNA metabarcoding is an economical, fast and reliable alternative to identification via light microscopy for river quality monitoring. Using a short DNA sequence ...
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Names, diagnoses and ‘Dead Names’: the case of Synedra pelagica Diatom Res. (IF 1.8) Pub Date : 2023-08-17 David M. Williams
The case of Synedra pelagica Hendey is discussed in terms of its nomenclature, the taxonomic implications of priority issues and its characterization. Application of replacement names for specific ...
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Description of Gomphonella saldanensis sp. nov. (Bacillariophyceae) from hydromagnesite stromatolites in Salda Lake, Turkey Diatom Res. (IF 1.8) Pub Date : 2023-07-20 Cüneyt Nadir Solak, Zlatko Levkov, Paul B. Hamilton, Asher Wishkerman, Elif Yilmaz, Malgorzata Bąk, Lukasz Peszek, Saul Blanco
Lake Salda has a unique environment due to the presence of hydromagnesite stromatolites. Samples collected from the stromatolites contained a new diatom species, Gomphonella saldanensis sp. nov., w...
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Orthoseira helvetica sp. nov. – a new diatom (Bacillariophyceae) from the Swiss Alps Diatom Res. (IF 1.8) Pub Date : 2023-07-17 Łukasz Peszek, Christopher T. Robinson, Mateusz Rybak, Barbara Kawecka
This paper describes a new diatom species (Orthoseira helvetica sp. nov.) found in the Swiss Alps at an elevation over 2600 m a.s.l. The diatom was recorded at the Macun plateau, Swiss National Par...
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Entomoneis grisslehamnensis, a New Diatom (Bacillariophyceae) from the Baltic Coast of Sweden with taxonomic and ecological notes on Entomoneis paludosa (W. Smith) Reimer Diatom Res. (IF 1.8) Pub Date : 2023-07-04 Adil Y. Al-Handal, Maja Mucko, Petra Peharec Štefanić, Angela Wulff
The diatom genus Entomoneis includes species with panduriform frustules characterized by a bilobate, elevated keel, sigmoid raphe canal and numerous open, porous girdle bands. During a phytoplankton survey along the Baltic coast of Sweden, we observed numerous Entomoneis cells, some belonging to the well-known Entomoneis paludosa, while others remained unknown. Morphological and ultrastructural studies
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Diversity and distribution of spine-bearing species of Pinnularia in eastern North America Diatom Res. (IF 1.8) Pub Date : 2023-06-13 Marina G. Potapova, Micaela H. Kersey, Laura L. Aycock
Six species of large-celled Pinnularia Ehrenberg from lakes of eastern North America, P. dariana (A.W.F. Schmidt) Mills, P. alabamae Krammer, P. bihastata (A. Mann) R.M. Patrick, P. torta (A. Mann) R.M. Patrick, P. rexlowei sp. nov. and P. spinifera sp. nov. are investigated with light and scanning electron microscopy. All six species are shown to possess marginal spines, a trait sporadically encountered
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Studies on type material from Kützing’s diatom collection VII: Achnanthes capensis Kützing, Achnanthes capensis ß [var.] multiarticulata Kützing and ‘Achnanthes striata Suhr’ Diatom Res. (IF 1.8) Pub Date : 2023-03-08 Kensuke Toyoda, David M. Williams, Eileen J. Cox, Tanja M. Schuster
Kützing described the species Achnanthes capensis Kützing along with the variety Achnanthes capensis ß multiarticulata Kützing. The latter was based on ‘Achnanthes striata Suhr’, a name first mentioned, without description or figure, in Drège’s Zwei pflanzengeographische Documente. ‘Achnanthes striata’ became a synonym of Achnanthes capensis in Kützing’s protologue without it ever being validly published
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Davidharwoodia megaspina gen. et sp. nov. (Corethrales), a new fossil marine diatom genus from Mors, Jutland (early Eocene) Diatom Res. (IF 1.8) Pub Date : 2023-02-02 Kenta Abe, Richard W. Jordan
A taxonomic survey of the early Eocene diatomites of Mors has revealed a new member of the Corethrales, Davidharwoodia megaspina gen. et sp. nov., which is the first fossil Corethron-like diatom to possess backward-pointing spines. The new species is presumably heterovalvate, with a rounded pyramidal Type 1 valve bearing a single huge leaf-shaped spine (and corresponding large socket) in addition to
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On the enigmatic diatom Rhizosolenia dubia, its relationship to Pseudopyxilla and Proboscia, and description of a new species, Proboscia pinocchioi sp. nov. Diatom Res. (IF 1.8) Pub Date : 2023-01-19 Kenta Abe, Richard W. Jordan
Pyxilla? dubia was originally described from Jutland, but subsequently transferred to Pseudopyxilla. However, the discovery, over eighty years apart, of two enigmatic specimens with tubular heterovalvate frustules featuring a Pseudopyxilla dubia valve at one end and a rhizosolenioid valve at the other end resulted in a new combination, Rhizosolenia dubia. Herein, we document in detail the valve morphology
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Morphological variability and genetic marker stability of 16 monoclonal pennate diatom strains under medium-term culture Diatom Res. (IF 1.8) Pub Date : 2022-12-02 Heba Mohamad, Demetrio Mora, Oliver Skibbe, Nélida Abarca, Verena Deutschmeyer, Neela Enke, Wolf-Henning Kusber, Jonas Zimmermann, Regine Jahn
Monoclonal diatom strains are the basis for integrative taxonomical studies combining molecular and morphological data for better taxonomic resolution and identification. The identification of diatoms, based on morphological features of the frustule, is difficult due to the variability of characters within and amongst species. The longer the cultivation time, the more cell size is reduced during asexual
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Paralia flatoniana sp. nov., a new species from the late Eocene of Texas with discussion on ecology and initial valves Diatom Res. (IF 1.8) Pub Date : 2022-11-25 Diane Winter, Thomas Yancey
A new Paralia Heiberg species, Paralia flatoniana sp. nov., is documented from a late Eocene diatomite and mudstone deposit in east central Texas. Paralia represents up to 63% of the assemblage in the diatomite samples and 34% in the mudstone. Numerous Paralia initial valves are present adding an unusual component to this assemblage as they are infrequently reported from samples containing populations
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Transcriptomic reprogramming of diatom Minutocellus polymorphus grown on urea Diatom Res. (IF 1.8) Pub Date : 2022-11-08 Mei Zhang, Ying Li, Tiezhu Mi, Feng Chen, Yu Zhen
Minutocellus polymorphus MMDL5290, a minute diatom, can efficiently utilize organic nitrogen (N) urea as the sole N source and achieve equivalent growth rate and photosynthesis capacity as it does with nitrate. Interestingly, M. polymorphus MMDL5290 growing on urea-replete (400 µM) medium yields a similar growth rate to that on nitrate-replete (882 µM). So far, very few reports are available on the
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Diatom taxonomy and environmental drivers of biodiversity in the Taleghan River and reservoir in Central Alborz, Iran Diatom Res. (IF 1.8) Pub Date : 2022-11-03 Ali Naseri, Mostafa Noroozi, Younes Asri, Alireza Iranbakhsh, Sara Saadatmand, Ehsan Atazadeh
The taxonomic composition of the diatom flora of the Taleghan River and reservoir in Iran is described. The Taleghan River is one of the main tributaries of the Sepid Roud River, which is the second-longest river in Iran (∼ 670 km). Its headwaters are located in the Alborz Mountains in northwestern Iran and discharge into the Caspian Sea (North Iran). The current study was conducted from November 2017
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Rimocostatus bugojnicus gen.et. sp. nov. (Coscinodiscophyceae, Bacillariophyta) – a new fossil diatom genus from Gračanica, Bugojno palaeolake in Bosnia and Herzegovina Diatom Res. (IF 1.8) Pub Date : 2022-11-03 Ermin Mašić, Dušica Zaova, Senka Barudanović, Nadja Ognjanova-Rumenova, Zlatko Levkov
A new freshwater fossil diatom taxon Rimocostatus bugojnicus gen. et sp. nov, from Miocene sediments at the Gračanica site, Bugojno palaeolake in Bosnia and Herzegovina, is described. The main morphological feature of the genus is the presence of marginal rimoportulae with simple, round external openings positioned on interfascicles on the valve mantle and stalked, large, wide internal slits, positioned
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Shionodiscus karianus sp. nov. (Thalassiosirales, Thalassiosiraceae), a new planktonic diatom from the Kara Sea and notes on some morphological characters of Shionodiscus taxa Diatom Res. (IF 1.8) Pub Date : 2022-10-12 Anton A. Georgiev, Maria A. Gololobova
The genus Shionodiscus (Thalassiosirales, Thalassiosiraceae) includes species that have strutted processes with long inward but reduced outward extensions, a labiate process typically located on the valve face, distant from the margin. Shionodiscus species inhabit the marine environment, and the genus includes both living and fossil species. In the course of our study of plankton samples from the Kara
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Observations on Late Cretaceous Micrampulla (Corethrales, Bacillariophyceae) from the Campbell Plateau (Zealandia), southwest Pacific Ocean Diatom Res. (IF 1.8) Pub Date : 2022-10-11 Kenta Abe, David M. Harwood, Richard W. Jordan
Late Cretaceous (late Campanian) diatom assemblages from the Campbell Plateau (Zealandia), southwest Pacific Ocean, obtained from Deep Sea Drilling Project (DSDP) Leg 29 Site 275, contain well-preserved specimens of two enigmatic diatom species currently assigned to the genus Ktenodiscus; Micrampulla parvula originally described from the Maastrichtian-age Moreno Shale, California, and Pterotheca cretacea
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Aulacoseira newjerseyana sp. nov. (Bacillariophyta) a new freshwater centric diatom species from the northeastern USA Diatom Res. (IF 1.8) Pub Date : 2022-10-06 Mihaela D. Enache, Marina G. Potapova, Meredith Tyree Polaskey, Sarah A. Spaulding
A new species of Aulacoseira Thwaites is described from sediment deposits of Surprise Lake, an isolated lake located in the New Jersey Highlands. The species is characterized by (1) a low mantle, (2) unevenly distributed mantle areolae of variable size and shape, and (3) a valve face covered by rounded areolae. The new species is most similar to Aulacoseira biseriata (Grunow in Van Heurk) Houk, R.
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Valve and ‘Stigma’ Structure and Phylogeny of an Enigmatic Cymbelloid Diatom Karthickia verestigmata Glushchenko, Kulikovskiy & Kociolek Diatom Res. (IF 1.8) Pub Date : 2022-09-09 Ekkachai Yana, Surakit Nakkaew, Jeeraporn Pekkoh, Yuwadee Peerapornpisal, Akihiro Tuji, Matthew P. Davis, Matthew L. Julius, Shigeki Mayama
The epilithic diatom Karthickia verestigmata Glushchenko et al. was described from North Viet Nam and Laos. Karthickia is a monotypic genus characterized by a unique ‘stigma’ located on the secondary side of the valve with an external circular opening and opening internally by two elongated slits. In 2012 we collected a diatom population consistent with the description of K. verestigmata from the Wang
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Determining geographical range and alien status in diatoms: three instructive case histories of species newly recorded in the British Isles, including a non-native marine species from the Pacific, Diademoides luxuriosa Diatom Res. (IF 1.8) Pub Date : 2022-08-16 David G. Mann
Three benthic diatom species – Diademoides luxuriosa, Navicula entoleia and Nitzschia ocellata – have been discovered for the first time in Scottish coastal waters. All are highly distinctive but rarely recorded, with less than 100 mentions found worldwide in an exhaustive search of the literature, even after taking into account possible synonyms. Even so, one of the three, D. luxuriosa, can be argued
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Drivers predicting biodiversity and community assembly of benthic diatoms in a karst spring environment Diatom Res. (IF 1.8) Pub Date : 2022-08-10 Pavel Beracko, Lucia Sochuliaková, Jakub Cíbik, Tomáš Lánczos
Geographical location, landscape heterogeneity, and their position at the edge of Quaternary glaciations are the major reasons why the river basins of the Western Carpathians are of the utmost importance for research on European aquatic biodiversity. Moreover, unlike streams, springs have several features determining their insularity in the river continuum. This study aimed to uncover the mechanism
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Symmetric biraphid diatoms (largely non-Navicula) from the Laurentian Great Lakes Diatom Res. (IF 1.8) Pub Date : 2022-08-09 Euan D. Reavie
This monograph contains descriptions of taxa from the diatom genera Craticula, Aneumastus, Decussiphycus, Cavinula, Lacustriella, Luticola, Mastogloia, Geissleria, Placoneis, Petroplacus, Navicula, Hippodonta, Sellaphora, Prestauroneis, Fallacia, Stauroneis, Brachysira, Anomoeoneis, Neidium, Diploneis, Caloneis, Pinnularia, Capartogramma, Frustulia, Amphipleura, Krasskella, Gyrosigma and Plagiotropis
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Seasonal variations of diatoms in a low-latitude mountain lake: a case study from Douhu lake-Southeast China Diatom Res. (IF 1.8) Pub Date : 2022-08-09 Jingkang Wang, Jie Li, Qi Cao, Patrick Rioual, Guoliang Lei, Binggui Cai, Yafei Zou, Hai Luo, Quanguo Li, Luo Wang
In the scientific literature on diatom ecology whether temperature drives changes in diatom assemblage directly or indirectly remains a subject of debate. In order to clarify the relationship between temperature and diatom assemblage composition, we focused on a region with significant seasonal changes but without a freezing period. From March 2016 to March 2018, sediment trap samples were collected
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Taxonomy and Valve Ultrastructure of New and Interesting Freshwater Fossil Diatoms (Bacillariophyta) of Miocene age from the Espanola Formation of New Mexico, USA. I. Ontogeny of Tetracyclus stelloides sp. nov., with Comments on ‘Accepted Names’ and Hustedt's Concepts of ‘Convergence’ and ‘Miserable Forms’ Diatom Res. (IF 1.8) Pub Date : 2022-08-09 J.P. Kociolek, D.M. Williams, A. Danz
We present the size diminution series of a new species of Tetracyclus, described herein as Tetracyclus stelloides Kociolek, D.M.Williams & Danz sp. nov., based on light and scanning electron microscopic observations. The largest cells of T. stelloides sp. nov. are cruciate in outline with broadly rounded apices and central inflations, the smallest cells are elliptical. Size, presence and position of
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Stauroneis terryi D.B. Ward ex T.C. Palmer: a forgotten diatom from northeastern North America Diatom Res. (IF 1.8) Pub Date : 2022-07-19 Marina Potapova, Caroline Gallen, Naomi Friedman
Stauroneis terryi D.B. Ward ex T.C. Palmer is a diatom so far reported from only five locations in the states of Connecticut, Massachusetts and Maine, USA, where it was collected in 1890—1911. There were no records of this large and rather conspicuous species in any collections made after 1911 despite the considerable number of diatom surveys and paleolimnological studies conducted in the northeastern
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Morphology and molecular phylogeny of Amphora baotuensis sp. nov., a new freshwater benthic diatom from a karst spring in China Diatom Res. (IF 1.8) Pub Date : 2022-07-18 Yuhang Li, Tamotsu Nagumo, Kuidong Xu
A new freshwater benthic diatom Amphora baotuensis is described from a karst spring in China, based on morphological and molecular phylogenetic data. Based on SSU rRNA and rbcL sequences the molecular phylogeny indicates that this species is closely related to A. copulata (Kützing) Schoeman & Archibald within the Amphora sensu stricto clade. Amphora baotuensis differs from congeners by a combination
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DNA barcoding reveals a new species of Stephanodiscus Ehrenberg Diatom Res. (IF 1.8) Pub Date : 2022-07-14 Konrad Schultz, Thomas Hübener, Olivier Jacques, Armin Springer, Marcus Frank, Mirko Dreßler
The taxonomic situation of the species complex around Stephanodiscus minutulus/parvus is controversial. Insufficient species description and fossil type material contribute to persistent confusion. Håkansson & Kling (1990) described S. binatus as another morphologically similar species in this group. Following the reinvestigation of the type materials of S. minutulus and S. parvus by Houk et al. (2014)
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Tropical South America Diatom Database: a tool for studying the macroecology of microorganisms Diatom Res. (IF 1.8) Pub Date : 2022-06-28 Xavier Benito, Melina Feitl, Maria L. Carrevedo, Maria I. Vélez, Jaime Escobar, Pedro M. Tapia, Miriam Steinitz-Kannan, Sherilyn C. Fritz
Determining the mechanisms of community assembly forms the foundation of biogeography and community ecology. Studies of the biodiversity and distribution of Neotropical macro-organisms have revealed the roles of environmental, spatial, and historical factors in structuring communities at different spatial and temporal scales. The role of these factors for species and communities of microorganisms are
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Cocconeis fetscheriana sp. nov. (Bacillariophyta) from streams in California (USA) with reference to the cingulum variability within the placentuloid species complex Diatom Res. (IF 1.8) Pub Date : 2022-06-09 Rosalina Stancheva
A novel diatom species, Cocconeis fetscheriana, is described from streams in California (USA). Detailed light and scanning electron microscopy of its frustules reveal a unique combination of characters. These are a highly variable and often irregular valve outline, rapheless sternum valves with characteristic dumbbell-shaped areolae, forming 7–14 longitudinal rows per hemi-valve, a lanceolate, slightly
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The type species of the diatom genus Chaetoceros Diatom Res. (IF 1.8) Pub Date : 2022-06-09 Wiebe H. C. F. Kooistra, Wolf-Henning Kusber, David U. Hernández-Becerril, Marina Montresor, Diana Sarno
Chaetoceros is one of the most abundant and diverse diatom genera in the phytoplankton of the world’s oceans. The genus was erected by Ehrenberg in 1844 for two species from the Southern Ocean: C. dichaeta and C. tetrachaeta. According to his description, the former possesses two setae per valve and the latter possesses four. Chaetoceros tetrachaeta, or any species with four setae per valve, has never
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Gomphotheca marciae (Bacillariophyceae: Bacillariaceae), a new species in a rarely seen genus Diatom Res. (IF 1.8) Pub Date : 2022-06-09 Christopher S. Lobban, Gabriella Helene Prelosky
Specimens of an extremely long, heteropolar nitzschioid diatom from mud scraped from mangrove pneumorrhizae on two Micronesian islands were identified as a new species of Gomphotheca. This genus contains two other, rarely seen species, only one of which has been observed with SEM. Our SEM images showed that G. marciae n. sp. is structurally similar to G. sinensis, with very long, heteropolar, cuneate
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Four new Orthoseira Thwaites species from Maui, Hawaii, and the Columbia River Gorge, Oregon, with comments on frustular morphology in the genus Diatom Res. (IF 1.8) Pub Date : 2022-04-27 A. Danz, J. P. Kociolek
Light, scanning electron and focused ion beam microscope observations are presented for four new species of the diatom genus Orthoseira Thwaites. Three species, O. mauiana sp. nov., O. loweana sp. nov. and O. hawaiiensis are described from Maui (Hawaiian Islands), and one species, O. oregoniana sp. nov., is described from Oregon, USA. These four species all possess carinoportulae, the feature that
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Diversity of the genus Orthoseira Thwaites (Bacillariophyceae) from Southeast Asia and Rapa Nui Island with descriptions of four new taxa Diatom Res. (IF 1.8) Pub Date : 2022-04-27 Mateusz Rybak, Anton Glushchenko, Andrzej Witkowski, Horst Lange-Bertalot, Maxim Kulikovskiy
The genus Orthoseira Thwaites contains centric diatoms typically inhabiting marginal-aquatic or terrestrial habitats. The high morphological plasticity of representatives of the genus and their occurrence in rarely studied terrestrial habitats complicates an overall assessment of their biodiversity and the distribution of particular species. This study presents a description of four new species of
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Updated distribution of the diatom Didymosphenia geminata (Lyngbye) Schmidt in Tierra del Fuego, Patagonia Diatom Res. (IF 1.8) Pub Date : 2022-04-21 Gabriela González Garraza, Patricia Rodríguez
In this study, we report new observations on the distribution of the invasive diatom Didymosphenia geminata on the island of Tierra del Fuego, southern Patagonia. We present new findings as well as data collected by the monitoring programme of the Government of the Tierra del Fuego. Didymosphenia geminata was first reported from the island in 2013, in the watershed of the Rio Grande, northeast of the
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Fontina Gen. nov. (Bacillariophyta): a new diatom genus from a thermo-mineral spring of the French Massif Central (France) Diatom Res. (IF 1.8) Pub Date : 2022-04-21 Aude Beauger, Carlos E. Wetzel, Olivier Voldoire, Elisabeth Allain, Vincent Breton, Didier Miallier, Luc Ector
Light and scanning electron microscope observations on the genus Fontina gen. nov. from a thermo-mineral spring of the Massif Central (France) are presented. Based on morphology, the new genus shows features that have not been described previously, such as the stria pattern, interrupted at the valve face/mantle junction and composed of one long, slit-like areola on both valve face and mantle. Externally
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Morphology of Amphora lunulata A.H. Wachnicka & E.E. Gaiser and its transfer to Seminavis D.G. Mann Diatom Res. (IF 1.8) Pub Date : 2022-03-28 Chenhong Li, Lanyu Tan, Yahui Gao, Xuesong Li, Lin Sun, Junrong Liang, Jun Zhang, Luqiang Huang, Changping Chen
An amphoroid diatom epiphytic on seagrass leaves from Hainan Province, southern China was identified as Amphora lunulata Wachnicka & Gaiser. It is characterized by a semi-elliptical valve with acute apices, ventral striae interrupted at the centre, and an axial area, which is well developed on the dorsal side but narrower at the centre, in accordance with its original description. However, as seen
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A new monoraphid diatom species from the genus Karayevia sensu lato (Bacillariophyceae: Stauroneidaceae) with remarks on taxonomy and phylogeny of the genus Diatom Res. (IF 1.8) Pub Date : 2022-03-28 Natalia Tseplik, Anton Glushchenko, Yevhen Maltsev, Irina Kuznetsova, Sergei Genkal, John Patrick Kociolek, Maxim Kulikovskiy
A new monoraphid diatom, Karayevia chelonica sp. nov., is described from Nha Trang, Vietnam, isolated from marine littoral habitats. Phylogenetic analysis based on partial 18S rDNA and rbcL sequences places this species within the family Stauroneidaceae, and related to other monoraphid species. Karayevia chelonica sp. nov. differs from other species in the genus in stria density and a broad axial area
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Studies on type material from Kützing’s diatom collection V – two new synonyms of Ulnaria vitrea (Kützing) E. Reichardt: Synedra mesocampa Brébisson in Kützing and Synedra tenuis Kützing Diatom Res. (IF 1.8) Pub Date : 2022-02-17 David M. Williams, Bart Van de Vijver
This short paper discusses two new synonyms of Ulnaria vitrea: Synedra mesocampa Brébisson in Kützing and Synedra tenuis Kützing. The data generated herein are based on original material and form a contribution to the taxonomic clarification of species in the genus Ulnaria. Both names discussed have barely been noticed since their original description and then usually considered as synonyms of Ulnaria
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New and interesting diatoms from the Shimen Wetwalls, Yunnan Province, China. I. Valve morphology of Melosira radiato-sinuata var. yunnanica Chen (Bacillariophyta: Melosirales) from Yunnan Province, China, with comments on its systematic position Diatom Res. (IF 1.8) Pub Date : 2022-02-08 J.P. Kociolek, Q. Liu, A. Danz
We examine and describe the frustular morphology of the diatom originally described as Melosira radiato-sinuata var. yunnanica from a wet wall in Yunnan Province, China, based on light and scanning electron microscopy. This diatom has carinoportulae present in the central portion of the valve, and prominent caverns present internally around the periphery of the valves. The valve mantle height varies
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Cyclotella (Bacillariophyceae) species present in sediments dating to Marine Isotope Stage 5 from Lake Chalco, central Mexico, with special reference to two new species: Cyclotella poyeka and Cyclotella tlalocii Diatom Res. (IF 1.8) Pub Date : 2022-02-02 Diana Avendaño, Margarita Caballero
Lake Chalco is one of the few lakes in Mexico that has a long, continuous sedimentary sequence covering the Upper Pleistocene (> 150 000 yrs). The diatom content of its lacustrine sediments includes a variety of centric species. In particular, the sediments dating to Marine Isotope Stage 5 (MIS5) were alternately dominated by four Cyclotella spp: C. meneghiniana Kützing, C. quillensis Bailey, and two
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Diatoms.org: supporting taxonomists, connecting communities Diatom Res. (IF 1.8) Pub Date : 2022-01-11 Sarah A. Spaulding, Marina G. Potapova, Ian W. Bishop, Sylvia S. Lee, Tim S. Gasperak, Elena Jovanoska, Paula C. Furey, Mark B. Edlund
Consistent identification of diatoms is a prerequisite for studying their ecology, biogeography, and successful application as environmental indicators. However, taxonomic consistency among observers has been difficult to achieve because taxonomic information is scattered across numerous literature sources, presenting challenges to the diatomist. Firstly, literature is often inaccessible because of
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Diatom assemblages from an Eemian palaeolake in Northern Europe with morphological observations of rare Aulacoseira sp. resting spores Diatom Res. (IF 1.8) Pub Date : 2021-12-14 Anna Plikk, Jan Risberg, Karin F. Helmens
An overview of the diatom flora of the last interglacial (Eemian) lacustrine gyttja deposit at Sokli, northeastern Finland is presented together with descriptions including photomicrographs of resting spores similar to the Aulacoseira islandica-skvortzowii group, not found in recent material from Europe. Comparisons are made with literature data on similar taxa. The morphology of the resting spores
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Diatom biogeography in freshwaters – new insights from between-region comparisons and the role of unmeasured environmental factors Diatom Res. (IF 1.8) Pub Date : 2021-12-08 Janne Soininen, Vilja Tupola, Inka Voutilainen, Marco Cantonati, Anette Teittinen
Diatom biogeography has attracted increased attention especially over the past two decades. However, due to covariance between space and environment, diatom biogeographical studies suffer from the fundamental problem of reliably evaluating the relative roles of dispersal processes versus local environment in shaping diatom distributions. Using between-region comparisons, we investigate whether diatom
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A simple method for making transverse cleavages of diatom frustules for scanning electron microscopy and its application Diatom Res. (IF 1.8) Pub Date : 2021-12-08 Nagisa Mayama, Shigeki Mayama
The surface structures of diatom valves have been primarily studied using scanning electron microscopy (SEM), while the frustule shape and internal cellular structures have been elucidated in cross-sections by transmission electron microscopy (TEM). However, ultrathin sections can show neither the part of the whole frustule that is cut nor reflect the relationship between the sectioned portion and
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The morphology and phylogeny of the diatom genera Rhizosolenia, Proboscia, Pseudosolenia and Neocalyptrella from Gulf of Thailand and the Andaman Sea, with description of Rhizosolenia loanicola sp. nov., Proboscia siamensis sp. nov. and Probosciales ord. nov. Diatom Res. (IF 1.8) Pub Date : 2021-10-26 Atchaneey Boonprakob, Nina Lundholm, Linda K. Medlin, Øjvind Moestrup
The marine planktonic diatom genera Rhizosolenia, Proboscia, Pseudosolenia and Neocalyptrella have been studied with emphasis on morphology and phylogeny. Material was collected October 2008—January 2011 at seven localities in the four provinces of the marine coastal waters of Thailand: Rayong, Chonburi, Chumphon and Phuket. Fifty strains were established in culture and used for morphological and phylogenetic
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The diatom flora of the Tonle Sap Lake in Cambodia: Centrobacillariophycidae – inventory and description of five new taxa including Praecyclostephanos gen. nov. Diatom Res. (IF 1.8) Pub Date : 2021-11-16 Loïc Tudesque, René Le Cohu, Bart Van de Vijver
We provide an update to our knowledge of the centric diatoms in the Tonle Sap Lake (Cambodia) by providing a new and highly detailed iconography of all observed taxa based on light and scanning electron microscopy. We highlight a distinctive flora, including a new genus Praecyclostephanos gen. nov. and five taxa new to science: Aulacoseira micropunctata sp. nov., A. spiralorimoportula sp. nov., Praecyclostephanos
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Diversity and spatial distribution of soil diatoms along a natural altitudinal gradient in the High Atlas (Morocco) Diatom Res. (IF 1.8) Pub Date : 2021-10-26 Farah Minaoui, Zineb Hakkoum, Mountasser Douma, Khadija Mouhri, Mohammed Loudiki
Microscopic algae especially diatoms (Class Bacillariophyceae) are an important component of biological soil crusts (or biocrust) communities in arid and semi-arid environments. In Morocco, a largely arid and semi-arid African Mediterranean country, the soil diatom diversity and ecology remain unexplored, unlike aquatic diatoms. This study aims to understand the spatial distribution of soil diatoms
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Aulacoseira chockii sp. nov., an early freshwater centric diatom from the Eocene bearing a unique morphology Diatom Res. (IF 1.8) Pub Date : 2021-11-16 Peter A. Siver
Aulacoseira is a freshwater diatom genus found today in numerous lakes, ponds and rivers worldwide, and inhabiting a wide range of environmental conditions. The genus is one of the oldest diatom lineages known to colonize freshwater environments, dating to the late Cretaceous and radiating over much of the Cenozoic. The purpose of this paper is to describe a new species, Aulacoseira chockii, from an
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Novel Diatoms (Bacillariophyta) from tropical and temperate marine littoral habitats with the description of Catenulopsis gen. nov., and two Catenula species Diatom Res. (IF 1.8) Pub Date : 2021-10-26 Adrian Kryk, Andrzej Witkowski, Lourenço Ribeiro, John P. Kociolek, Shigeki Mayama, Rafał J. Wróbel, Yenny Risjani, Yunianta, John Bemiasa, Etienne Bemanaja
Regions with high levels of biodiversity, which mostly correspond to tropical regions, can be treated as treasuries of endemism, even for single-celled life forms. Learning about these areas, and the species present in them, is key to understanding the processes that govern their emergence and sustainability. This paper is a contribution towards revealing the biodiversity of marine benthic diatom species
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A new Brachysira species from mountain lakes in northern Italy and Corsica Diatom Res. (IF 1.8) Pub Date : 2021-11-16 Marco Cantonati, Nicola Angeli, Elena Arnaud, Matteo Galbiati, Éva Soróczki-Pintér, Horst Lange-Bertalot
A faintly heteropolar Brachysira species, with an acutely rounded headpole and a base pole which is sometimes slightly protracted, found in two lakes in northern Italy and Corsica, is described and named Brachysira chiaruccii sp. nov. This proposed new species can be differentiated from similar species by recognizable characters or character combinations: valve outline and symmetry, shape of the apices
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New observations on the large hemidiscoid diatom Palmerina ostenfeldii and its symbiotic ciliate Vaginicola collariforma sp. nov. from subtropical Australian waters Diatom Res. (IF 1.8) Pub Date : 2021-06-03 Julian Uribe-Palomino, Romain Gastineau, Anthony J. Richardson, Nick M. Wade, Lucy Whittock, Gustaaf M. Hallegraeff
The large hemi-discoid diatom Palmerina ostenfeldii was common in subtropical Moreton Bay, Australia, following a flood in January 2011. All diatom cells exhibited diagnostic subapical folds settled by loricate peritrich ciliates, but which readily abandoned stressed diatom cells. We characterized both diatoms and ciliates by morphological and molecular analyses, including careful video observations
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Phylogenetic analysis places Spicaticribra within Cyclotella Diatom Res. (IF 1.8) Pub Date : 2021-06-10 Kala M. Downey, Matthew L. Julius, Edward C. Theriot, Andrew J. Alverson
A strong consensus has emerged that taxonomic classifications should be based on an underlying phylogenetic hypothesis. According to this view, named groups should be monophyletic, ensuring that a name uniquely matches the evolutionary history and biological attributes of a group of taxa. As originally conceived, the diatom genus Cyclotella is a large and morphologically diverse assemblage of taxa
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Fragilaria subrecapitellata (Fragilariaceae, Bacillariophyta), a new diatom species from Switzerland Diatom Res. (IF 1.8) Pub Date : 2021-07-27
During a biomonitoring assignment in the Swiss canton Ticino, an unknown Fragilaria taxon was discovered that could not be identified using the currently available literature. The results of a morphological comparison with the type material of F. recapitellata, based on light and scanning electron microscopy, showed that the new Swiss taxon has sufficient differences to be separated as a new species:
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Navithidium gen. nov., a new monoraphid diatom (Bacillariophyceae) genus based on Achnanthes delicatissima Simonsen Diatom Res. (IF 1.8) Pub Date : 2021-06-09 Adil Y. Al-Handal, Oscar E. Romero, Sara Lena Eggers, Angela Wulff
We investigated the ultrastructure of Achnanthes delicatissima Simonsen in materials collected from the Swedish Baltic coast. Valve structure differs markedly from that of Achnanthes sensu lato, particularly in the absence of cribrate areolae which separates Achnanthes from all other members of the family Achnanthaceae. Comparing this species with those recently described achnanthoid genera, such as