Pinnularia qinghainensis: a new diatom species (Bacillariophyta) found in the brackish Lake Qinghai, China

Phytotaxa ◽  
2021 ◽  
Vol 483 (1) ◽  
pp. 80-84
Author(s):  
LI-YING DENG ◽  
SAÚL BLANCO ◽  
BING LIU ◽  
SI-JIN QUAN ◽  
JI-YAN LONG
Keyword(s):  
Diatom Species ◽  
Undescribed Species ◽  
Lake Qinghai ◽  
Brackish Lake ◽  
Diatom Flora

During the investigations of the diatom flora of Lake Qinghai, China (see Liu et al. 2020 for details), specimens of an undescribed species of Pinnularia Ehrenberg (1843: 45) were encountered, which are hereby illustrated and described.

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.

Ctenophora sinensis: a new diatom species (Bacillariophyta) from China with comments on its structure, nomenclature and relationships

Phytotaxa ◽  
2020 ◽  
Vol 460 (2) ◽  
pp. 115-128
Author(s):  
BING LIU ◽  
DAVID M. WILLIAMS ◽  
ZHU-XIANG LIU ◽  
JIN-HUA CHEN
Keyword(s):  
Brackish Water ◽  
Central Area ◽  
Diatom Species ◽  
Lake Qinghai ◽  
Vegetative Cells ◽  
Qinghai Province ◽  
Water Lake ◽  
Brackish Water Lake

Lake Qinghai is an ancient brackish water lake in the Qinghai province of China. A number of endemic diatom species have already been discovered and described from the lake. This study describes another new endemic diatom species: Ctenophora sinensis sp. nov. Ctenophora sinensis has the following features: (1) frustule and valve are lanceolate; (2) the central area is slightly buttressed internally; (3) its areolae have both outside sieve-like closing plates and inside hymenate occlusions; (4) an apical hyaline field exists near each rimoportula; (5) a pseudoseptum is always presents at each pole; and (6) the cingulum has a 4:2 configuration of girdle bands in normal vegetative cells. Some remarks are provided on the nomenclature of Ctenophora and a few comments on the relationships of the genus.

New taxa of the genus Navicula (Bacillariophyceae) in the diatom flora of Serbia

2014 ◽  
Vol 43 (2) ◽  
Author(s):  
Danijela Vidakovic ◽  
Jelena Krizmanić ◽  
Sanja Šovran
Keyword(s):  
New Taxa ◽  
Floristic Diversity ◽  
Diatom Species ◽  
River Ecology ◽  
Stone Surface ◽  
Diatom Flora ◽  
Acid Method ◽  
Epilithic Diatom

AbstractThe main objective of this paper is to report two benthic, epilithic diatom species from the Raška River. Samples were collected in April, June, August and November 2011 and March and May 2012 from 5 localities along the Raška River by scraping off the stone surface using a brush. Diatom frustules were first cleaned using the cold acid method, and then mounted on permanent slides. Descriptions (main valve measurements of the populations in the Raška River), ecology, distribution in Serbia and Europe, and appropriate photomicrographs of two species are presented. Navicula jakovljevicii Hustedt and Navicula catalanogermanica Lange-Bertalot & Hofmann are rarely found in Europe and these are new distributional records. These new taxa significantly contribute to diatom floristic diversity of the Raška River.

A new species of Cymbella (Bacillariophyceae, Cymbellaceae) from the Pavana River, Western Ghats, India

Phytotaxa ◽  
2019 ◽  
Vol 395 (3) ◽  
pp. 209 ◽  
Author(s):  
ANBUKKARASU VIGNESHWARAN ◽  
MAXIM S. KULIKOVSKIY ◽  
ANTON GLUSHCHENKO ◽  
JOHN PATRICK KOCIOLEK ◽  
BALASUBRAMANIAN KARTHICK
Keyword(s):  
New Species ◽  
Western Ghats ◽  
Species Description ◽  
Diatom Species ◽  
Diatom Flora ◽  
Apical Pore ◽  
Lotic System ◽  
New Species Description ◽  
A New Species

New diatom species from the genus Cymbella is described, Cymbella pavanaensis from the Pavana River situated in Pimpri-Chinchwad, Pune, Maharashtra, India. The new species description is based on detailed LM and SEM morphological observations. Comparison of the new species with similar, previously-described taxa is made. C. pavanaensis belongs to a group of small-celled species of the genus, which lack differentiated, rounded porelli comprising the apical pore fields. This taxon is reported from a moderately to the highly-polluted urban lotic system, which signifies that even the diatom flora of easily accessible habitats of India is yet to be fully documented.

scholarly journals Study of Diatom Flora of Kaalesar Ghat of Rapti River at Gorakhpur for Forensic Consideration

2021 ◽  
Vol 9 (10) ◽  
pp. 555-559
Author(s):  
Ashutosh Mall
Keyword(s):  
Forensic Science ◽  
Ecological Assessment ◽  
The Other ◽  
Diatom Species ◽  
Acid Digestion ◽  
Digestion Method ◽  
Diatom Flora ◽  
Diatom Test ◽  
Death By Drowning ◽  
Diagnosis Of Death

Abstract: Diatoms are unique algae. They are scientifically known as Bacillariophyceae. Diatoms have been used in forensic science in a variety of ways, the most frequent being the diagnosis of death by drowning. When a person drowns, water will enter the lungs and then enter the bloodstream through ruptures in the peripheral alveoli before being carried to the other organs such as the liver and heart. Naturally, the microscopic contents of the water, which will include diatoms, will pass into the blood as well. The detection of diatoms in the organs can contribute to a diagnosis of death by drowning, a process referred to as the ‘diatom test’. A study was conducted in the department of Forensic Science, SHUATS, Prayagraj which included the extraction and identification of diatoms from the collected water samples from three different sites of Kaalesar Ghat of Rapti River in Gorakhpur. The acid digestion method was used for diatom extraction. And, after analysis total 13 diatom species were found. The identified diatoms were of great ecological assessment that plays an important role in criminal investigations related to premortem or ante-mortem drowning. Keywords: Diatom, Drowning, D-mapping, Rapti-River

Olifantiella elisabethiana, a new raphid diatom species (Bacillariophyta) observed in the Port of Antwerp (Belgium)

Phytotaxa ◽  
2016 ◽  
Vol 261 (3) ◽  
pp. 251 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
ADRIENNE MERTENS ◽  
HERMAN VAN DAM
Keyword(s):  
Coastal Waters ◽  
Original Description ◽  
Diatom Species ◽  
Diatom Flora ◽  
Internal Process ◽  
Extensive Analysis ◽  
Transmission Electron ◽  
Valve Margin ◽  
Scanning Electron

During an extensive analysis of the diatom flora of the Port of Antwerp (Belgium) in 2008, an unknown naviculoid taxon was observed. Detailed morphological investigations using light, scanning electron and transmission electron microscopy resulted in the description of this unknown taxon as Olifantiella elisabethiana Van de Vijver sp. nov. This new small-celled, biraphid species is characterized in having a typical internal process named buciniportula, opening externally by a pore or slit, unseriate striae composed of one single transapically elongated areola and a siliceous hymenous velum extending internally from the valve mantle to halfway the valve margin and the axial area. The morphological observations allowed to precise the characterization of the genus Olifantiella. A modification of the original description is proposed with regard to the internal structure. The presence of this Olifantiella species in the northern hemisphere is briefly discussed as all other known taxa of this genus have only been found in the tropical coastal waters of the Indian and Pacific Ocean.

scholarly journals Diatom species composition of the Nisava river and its tributaries Jerma and Temska rivers (southern Serbia)

2012 ◽  
Vol 64 (3) ◽  
pp. 1127-1140 ◽  
Author(s):  
Jelena Andrejic ◽  
Jelena Krizmanic ◽  
M. Cvijan
Keyword(s):  
Species Composition ◽  
Benthic Diatom ◽  
Future Research ◽  
Diatom Species ◽  
Diatom Flora ◽  
Chemical Agents ◽  
Floristic Analysis

The main objective of this paper is to report the diatom taxa identified from the Nisava River and its tributaries, the Jerma and Temska rivers. The study area included 11 sampling sites along the Nisava River, with one site on the Jerma River and one on the Temska River. Monthly samples (from stones, sediments and macrophytes) were collected from May 2008 to May 2009. Diatom frustules were cleaned with chemical agents, and mounted on permanent slides. In total, 194 diatom taxa were identified. The most species rich genera are Navicula (25), Nitzschia (17) and Gomphonema (13), while other genera are presented with one or more species. Detailed floristic analysis of the benthic diatom flora has not been conducted before on these rivers. Therefore, this paper provides a baseline for future research.

scholarly journals Diatom species composition in the Raska river (Southwestern Serbia)

2015 ◽  
pp. 29-40
Author(s):  
Danijela Vidakovic ◽  
Jelena Krizmanic ◽  
Sanja Sovran ◽  
Katarina Stojanovic ◽  
Jelena Djordjevic
Keyword(s):  
Species Composition ◽  
Benthic Diatom ◽  
Diatom Species ◽  
Diatom Flora ◽  
Epilithic Diatoms ◽  
Acid Method ◽  
Floristic Analysis

The paper presents data on the composition of epilithic diatoms in the Raska River. Samples were collected by scraping stone surfaces with a brush from 5 localities along the Raska River in April, June, August and November 2011 and March and May 2012. Diatom frustules were cleaned using cold acid method, and mounted on permanent slides. An investigation of the Raska River resulted in description of 106 diatom taxa. The most species rich genera are Navicula (10), Gomphonema (10) and Nitzschia (9), while other genera are presented with one or more species. Detailed floristic analysis of the benthic diatom flora in this river has not been conducted before. Therefore, this paper provides a groundwork for future researches.

Humidophila komarekiana sp. nov. (Bacillariophyta), a new limnoterrestrial diatom species from King George Island (Maritime Antarctica)

Phytotaxa ◽  
2016 ◽  
Vol 272 (3) ◽  
pp. 184 ◽  
Author(s):  
NATALIA KOCHMAN-KĘDZIORA ◽  
TERESA NOGA ◽  
RALITSA ZIDAROVA ◽  
KATEŘINA KOPALOVÁ ◽  
BART VAN DE VIJVER
Keyword(s):  
New Species ◽  
Marine Diatom ◽  
South Shetland Islands ◽  
Diatom Species ◽  
King George Island ◽  
Maritime Antarctica ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Shetland Islands ◽  
The Antarctic

During a survey of the non-marine diatom flora of King George Island (South Shetland Islands), an unknown Humidophila taxon was recorded. Detailed light and scanning electron microscopy observations indicated that the unknown taxon could not be identified based on the currently available literature. The new species is described as Humidophila komarekiana sp. nov. and is characterized in having strictly linear valves with parallel margins and broadly rounded, never protracted apices, a filiform raphe with almost indistinct, straight proximal and distal raphe endings. The striae are composed of one, irregularly shortened areola. The mantle areolae are interrupted at the apices. The new species is compared with similar taxa in the Antarctic Region and worldwide. Notes on the ecology of the new species are added.

scholarly journals Epipelic Diatom Communities in Pengilon Lake Dieng, Central Java

2019 ◽  
Vol 125 ◽  
pp. 01023 ◽  
Author(s):  
Tri Retnaningsih Soeprobowati ◽  
Jumari ◽  
Riche Hariyati ◽  
Fini Wulandari
Keyword(s):  
Diversity Index ◽  
Benthic Diatom ◽  
Acidic Environment ◽  
Diatom Species ◽  
Diatom Flora ◽  
Central Java ◽  
Physical Chemical ◽  
Diatom Communities ◽  
Tropical Areas ◽  
High Diversity

Diatom communities in the lake have an advantage of environmental assessment and paleo reconstruction study, due to the ability of diatom preserved in the sediment. There are only limited studies about taxonomy, ecology, and diversity of diatom flora in tropical areas, especially Indonesia. The main objective of the research is to describe the structure of benthic diatom communities in Pengilon Lake, together with physical chemical variables. Sediment samples were collected at an altitude of more than 2,000 msal habitats with pH around 5.40-6.86. A total of 83 diatom species identified as belonging to 16 families. The diversity index ranges from about 2.25 to 3.01 indicated the ecosystem that naturally stable with none diatom dominant. The most abundant genera were Eunotia with high diversity around 14 taxa. The composition of Eunotia assemblages was different among habitat and season variation. Eunotia has a wide tolerance of pH because of its ability to survive in an area with an acidic environment and circumneutral water. The most dominance diatom species in Pengilon Lake were Eunotia paludosa (Grunow) 39.2%, Nitzschia frustulum (Kutzing) 28.1%, Pinnularia viridis (Krammer & Lange-Bertalot) and Pinnularia divergentissima (Grunow) 24.6%.

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