scholarly journals Valuable habitats of protected areas in southern Poland – a source of rare and poorly known diatom species

2019 ◽  
Vol 88 (1) ◽  
Author(s):  
Teresa Noga
Keyword(s):  
Electron Microscopy ◽  
National Parks ◽  
Morphological Characteristics ◽  
Diatom Species ◽  
Rare And Endangered Species ◽  
New Localities ◽  
Rare And Endangered ◽  
Unique Study ◽  
Scanning Electron ◽  
Freshwater Diatom

The peatbogs and natural upper sections of streams in national parks in southeastern Poland represent unique study areas for research on freshwater diatom diversity. During studies conducted on diatoms in three Polish national parks, many little-known, very rare, and endangered species were noted. For most of the taxa presented in this article, especially from the <em>Adlafia</em>, <em>Eunotia</em>, and <em>Placogeia</em> genera, only single individuals have been observed, and only from a few localities worldwide. Moreover, this is the first presentation of SEM photodocumentation and descriptions for <em>Eunotia minutula</em> Grunow and <em>Fallacia sublucidula</em> (Hustedt) D. G. Mann. Based on both light and scanning electron microscopy, detailed descriptions of morphological characteristics, ecological notes, and new localities are presented for the following species: <em>Adlafia langebertalotii</em> Monnier &amp; Ector, <em>Caloneis undulata</em> (Gregory) Krammer, <em>Eunotia fennica</em> (Hustedt) Lange-Bertalot, <em>E. glacialifalsa</em> Lange-Bertalot, <em>E. groenlandica</em> (Grunow) Nörpel-Schempp &amp; Lange-Bertalot, <em>E. minutula</em> Grunow, <em>E. neocompacta</em> Mayama var. <em>neocompacta</em>, <em>E. superpaludosa</em> Lange-Bertalot, <em>Fallacia sublucidula</em> (Hustedt) D. G. Mann, <em>Pinnularia rhombarea</em> Krammer, <em>P. similiformis</em> Krammer, <em>Placogeia gereckei</em> (Cantonati &amp; Lange-Bertalot) Bukhtiyarova, and <em>Sellaphora vitabunda</em> (Hustedt) D. G. Mann.

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

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

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

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

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

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

Ninastrelnikovia lateritica sp. nov., a new and rare freshwater diatom species from the rocky pools of the Western Ghats, India with a note on the genus Ninastrelnikovia Lange-Bertalot & A.Fuhrmann (Bacillariophyta)

Phytotaxa ◽  
2019 ◽  
Vol 394 (1) ◽  
pp. 59
Author(s):  
SURAJIT ROY ◽  
JOHN PATRICK KOCIOLEK ◽  
REX L. LOWE ◽  
BALASUBRAMANIAN KARTHICK
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Western Ghats ◽  
Morphological Features ◽  
Diatom Species ◽  
Morphological Comparison ◽  
Valve Margin ◽  
The Western Ghats ◽  
Scanning Electron ◽  
Freshwater Diatom

Ninastrelnikovia lateritica sp. nov., a new and rare freshwater biraphid diatom species was discovered from a rocky ephemeral pool of the Kaas plateau, Western Ghats, and described on the basis of light and scanning electron microscopy observations. A morphological comparison with the two other described Ninastrelnikovia taxa is provided. This new species can easily be separated from its congeners by the shape of the valve apex and absence of any second inflation along the valve margin, as well as the shape and structure of the external distal raphe ends and internal proximal raphe ends. The members of Ninastrelnikovia are characterized by two morphological types of valves. Valves on the ends of colonies exhibit one set of morphological features while valves located in the middle of colonies show another set of morphological features. Morphological details of the valves are discussed.

Cymbella xiaojinensis sp. nov., a new cymbelloid diatom species (Bacillariophyceae) from high altitude lakes, China

Phytotaxa ◽  
2021 ◽  
Vol 482 (1) ◽  
pp. 55-64
Author(s):  
YUN ZHANG ◽  
MENGNA LIAO ◽  
YAN-LING LI ◽  
FENG-QIN CHANG ◽  
JOHN PATRICK KOCIOLEK
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Morphological Characteristics ◽  
Morphological Description ◽  
Hengduan Mountains ◽  
Diatom Species ◽  
A New Species ◽  
Scanning Electron

This paper describes a new species of Cymbella from an alpine lake in the Hengduan Mountains, southwestern China. The detailed morphological description of the new species, named Cymbella xiaojinensis sp. nov. is presented, based on light and scanning electron microscopy. The main features of C. xiaojinensis are characterized by strongly dorsiventral, triangular valves with a strongly reverse-lateral raphe system positioned near the proximal ends and an asymmetrical, larger central area, occupying approximately 1/2 of the width with the valve. Most morphological characteristics of the new species are similar to C. shudunensis, C. terrafuegiana, C. pamirensis, and C. gravida, but differ in details of size, valve shape, striae density, central area, and number of stigmata.

scholarly journals Pinnularia baeticasp. nov. (Bacillarophyceae): a new diatom species found in an alkaline mountain lagoon in the south of Europe (Granada, Spain)

2018 ◽  
Author(s):  
David Fernádez-Moreno ◽  
Ana T. Luís ◽  
Pedro M. Sánchezcastillo
Keyword(s):  
Electron Microscopy ◽  
Morphological Characters ◽  
The Other ◽  
Diatom Species ◽  
The North ◽  
The One ◽  
A New Species ◽  
South Of Europe ◽  
Scanning Electron ◽  
Freshwater Diatom

AbstractA new benthic freshwater diatom species belonging to the genusPinnulariawas found in Laguna Seca of Sierra Seca in the north of the province of Granada, Spain.Pinnularia baeticasp.nov. is proposed as a new species based on observations under light (LM) and scanning electron microscopy (SEM) and its special ecology typical of a calcareous lagoon. The most similar taxa toP. baeticaisP. atlasiiand with more differencesP. infirmaand the last two were studied through material obtained in lagoons of northern Morocco. Although there are similarities in the morphological characters of the frustule, it was possible to verify through LM and SEM micrographs, evident differences between P. baetica and the other two taxa; on the one end,P. baeticahas a panduriform shape more pronounced thanP. infirmaand bigger size. On the other hand, the absence of spines inP. baeticaand the more convergent striation at the poles are the main differences with P. atlasi.Phylum Ochrophyta Caval.-Sm. (Cavalier-Smith 1995)Class Bacillariophyceae Haeckel emend. Medlin & Kaczmarska (Medlin & Kaczmarska 2004)SubclassBacillariophycidaeRound (Round et al. 1990)OrderNaviculales(Bessey 1907 sensu emend)Family Pinnulariaceae D.G. Mann, 1990, GenusPinnulariaC.G. Ehrenberg, 1843Pinnularia baeticaFernández Moreno & Sánchez Castillo sp. nov

Encyonema oblonga (Bacillariophyta, Cymbellaceae), a new species from Shanxi Province, China

Phytotaxa ◽  
2021 ◽  
Vol 480 (3) ◽  
pp. 284-290
Author(s):  
QI LIU ◽  
JIAJIA LI ◽  
QUANXI WANG ◽  
JOHN PATRICK KOCIOLEK Patrick Kociolek ◽  
Shulian Xie
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Shanxi Province ◽  
Diatom Flora ◽  
A New Species ◽  
Scanning Electron ◽  
Freshwater Diatom

A new species, Encyonema oblonga Liu & Xie, is collected during a survey of the freshwater diatom flora of Manghe River, Shanxi, China. The valves of this new species are oblong with rounded apices and have the features typical of Encyonema, including complex areolae. We compare the new species with the most similar taxa, E. leei, E. leei var. sinensis and E. appalachianum and consider that  E. leei var. sinensis is the valid name.  The morphology of E. oblonga is documented with light and scanning electron microscopy.

Angusticopula rowlingiana, a new melosiroid diatom (Bacillariophyta) from Ascension Island (South Atlantic Ocean)

Phytotaxa ◽  
2019 ◽  
Vol 388 (2) ◽  
pp. 155 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
SANDRA WILFERT ◽  
VACLAV HOUK ◽  
DAVID M. JOHN
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Atlantic Ocean ◽  
Diatom Species ◽  
Ascension Island ◽  
Remote Island ◽  
A New Species ◽  
Similar Combination ◽  
Southern Atlantic Ocean ◽  
Scanning Electron

During a diatom survey of some samples from Ascension Island, a remote island located in the southern Atlantic Ocean, an unknown melosiroid diatom species was studied using both light and scanning electron microscopy. It proved to be a new species described as Angusticopula rowlingiana sp. nov. and characterized by a large number of narrow copulae in the girdle, a marginal ring of small granules, very small pores covering the entire valve face and occasionally having internal valves.                The new species is compared with all Angusticopula species known worldwide and with several Melosira species showing a similar combination of characters. Short notes on its ecology are included.

scholarly journals Analysis of the type material of Achnanthes minutissima var. macrocephala (Bacillariophyta) and description of two new small capitate Achnanthidium species from Europe and the Himalaya

2019 ◽  
Vol 152 (2) ◽  
pp. 340-350
Author(s):  
Carlos E. Wetzel ◽  
Ingrid Jüttner ◽  
Smriti Gurung ◽  
Luc Ector
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Benthic Diatom ◽  
Original Material ◽  
Diatom Species ◽  
The World ◽  
Freshwater Habitats ◽  
The Himalaya ◽  
Scanning Electron ◽  
Achnanthes Minutissima

Background and aims – Two unknown benthic diatom species belonging to the genus Achnanthidium Kütz., and found in French and Nepalese freshwater habitats, were investigated. Both species are here described as new and compared with the original material of Achnanthes minutissima var. macrocephala Hust. [≡ Achnanthidium macrocephalum (Hust.) Round & Bukht.] from Indonesia. Methods – The morphology of three small and capitate Achnanthidium species was investigated using light microscopy (LM) and scanning electron microscopy (SEM). Key results – Achnanthidium coxianum sp. nov. (from the Himalaya) belongs to the group of species with hooked terminal raphe endings, while Achnanthidium peetersianum sp. nov. (from France) has variable terminal raphe endings which are usually slightly bent. Achnanthidium macrocephalum is a much rarer species and illustrations concerning its identity in the literature do not conform to the type studied here. Conclusions – The three species are similar in LM but clearly distinct in SEM. The shape of the areolae and terminal raphe endings separate the species. Achnanthidium macrocephalum has often been misidentified in studies from many areas of the world. It is similar to the new species in valve outline and in its small dimensions.

scholarly journals Analysis of the type material of Gomphosphenia tackei (Bacillariophyceae) and comparison to epizoic diatom populations on freshwater snails

2021 ◽  
Vol 154 (2) ◽  
pp. 257-263
Author(s):  
Mateusz Rybak ◽  
Łukasz Peszek ◽  
Anita Poradowska
Keyword(s):  
Electron Microscopy ◽  
Lymnaea Stagnalis ◽  
Morphological Characteristics ◽  
Small Cell ◽  
Type Material ◽  
Freshwater Snails ◽  
Sem Images ◽  
Small Cell Size ◽  
Type Population ◽  
Scanning Electron

Background and aims – Hustedt (1942) originally described Gomphosphenia tackei from Germany under the name Gomphonema tackei. Because of the small cell size and the lack of scanning electron microscopy (SEM) images from the type material, it is often confused with other species from this genus, especially with G. stoermeri. The aim of this paper was to present detailed morphological characteristics of G. tackei based on the analysis of the type material and of several epizoic populations from Central Europe. Material and methods – The material in this study was collected from the shells of the freshwater snails Lymnaea stagnalis, Planorbarius corneus, and Planorbis planorbis. Additionally, for an unambiguous species identification, the type material for Gomphosphenia tackei was analyzed using light and scanning electron microscopes.Key results – The presence of Gomphosphenia tackei was confirmed in the studied material. The largest population (up to 19%) was recorded on the shell surfaces of living snails, whereas on empty shells, the diatom did not seem to be present or only in very low numbers. Valves are typically clavate with rounded apices. Valves are frequently observed in girdle view, often joint together in pairs. The valves in the studied populations had a valve length of 7–29 µm, a valve width of 3–4 µm, and a stria density of 25–29 striae in 10 µm. In the type population, valve length ranged from 7.5 to 27 µm with a valve width of 3.0–4.0 µm and a stria density of 23–29 striae per 10 µm. Striae were composed of 2–4 elongated to rounded areolae per stria. At the apices, the striae were composed of one single areola. The cells were attached to the substratum by their footpole.Conclusion – Published illustrations of Gomphosphenia tackei do not always correctly represent this species. Individual cells are attached to the substratum by secreted mucilage, probably via their areolae or girdle band pores located on the footpole.

Four new species of monoraphid diatoms from Western Sichuan Plateau in China

Phytotaxa ◽  
2021 ◽  
Vol 479 (3) ◽  
pp. 257-274
Author(s):  
Q.M. YOU ◽  
K. ZHAO ◽  
Y.L. WANG ◽  
P. YU ◽  
J.P. KOCIOLEK ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Morphological Characteristics ◽  
Similar Species ◽  
Small Species ◽  
Western Sichuan ◽  
The Relationship ◽  
Scanning Electron ◽  
Apical Axis

Four new monoraphid diatoms are examined and described from a high-altitude (> 3000 m) region of western Sichuan, China.  The descriptions are based on light and scanning electron microscopy observations, and the four new species are compared with similar taxa worldwide.  Achnanthidium sichuanense sp. nov. has small, lanceolate-elliptical valves, with rounded apices. The outline and central area differentiate it from similar species.  The unique characteristic of Eucocconeis undulatum sp. nov. is that it has valves that are undulate along the apical axis, forming an “H”-shaped area on both raphe and rapheless valves as seen in light microscope (LM).  Platessa mugecuonesis sp. nov. and Platessa lanceolata sp. nov. are two small species, whose valve outlines and central areas make them different from other species in this genus.  A. sichuanense sp. nov. and E. undulatum sp. nov. are discussed in terms of the relationship between “Achnanthidium & Psammothidium” and “Eucocconeis & Psammothidium”, as these genera are difficult to separate according to morphological characteristics.

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