Valve ultrastructure of Nitzschia shanxiensis nom. nov., stat. nov. and N. tabellaria (Bacillariales, Bacillariophyceae), with comments on their systematic position

Phytotaxa ◽  
2017 ◽  
Vol 312 (2) ◽  
pp. 228 ◽  
Author(s):  
QI LIU ◽  
WEIWEI WU ◽  
JIE WANG ◽  
JIA FENG ◽  
JUNPING LV ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Systematic Position ◽  
The Other ◽  
Hunan Province ◽  
Similar Species ◽  
Middle Portion ◽  
Valve Morphology ◽  
Scanning Electron

Nitzschia shanxiensis nom. nov., stat. nov., described originally from Hunan Province, China as N. sinuata var. constricta Chen & Zhu, was observed from Shanxi and Guizhou Provinces. The morphology of N. shanxiensis is documented by light (LM) and scanning electron microscopy (SEM) and discussed in detail, including a comparison with the other similar species. Nitzschia shhanxiensis has a constricted middle portion of the valve, fibulae crossing about 1/2 of the valve face, and lacks a central nodule. In addition to the new species, N. tabellaria (Grunow) Grunow in Cleve & Grunow was also identified from the same locality, and its valve morphology is also documented with LM and SEM. We comment on other species of diatoms related to N. shanxiensis and N. tabellaria and their relationship to other related genera, including Grunowia and Denticula.

Morphology and ultrastructure of Hippodonta qinghainensis sp. nov. (Bacillariophyceae), a new diatom from Lake Qinghai, China

Phytotaxa ◽  
2014 ◽  
Vol 186 (2) ◽  
pp. 61 ◽  
Author(s):  
YUMEI PENG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
The Other ◽  
Similar Species ◽  
Unique Combination ◽  
Lake Qinghai ◽  
Geometric Morphometric ◽  
Morphometric Analyses ◽  
Scanning Electron

A new medium-sized species of Hippodonta (Bacillariophyceae) is described from Lake Qinghai, China. The morphology and ultrastructure of Hippodonta qinghainensis sp. nov. are described using light and scanning electron microscopy. This new species is compared with similar species of Hippodonta using conventional and geometric morphometric analyses. Hippodonta qinghainensis can be separated from the other species of Hippodonta by a unique combination of characters that include an elliptic-lanceolate to rhombic-lanceolate valve shape, non protracted apices, the absence of fascia, relatively coarse, uniseriate striae and the presence of two rows of lineolae around the valves apices.

Gomphosinica selincuoensis sp. nov., a new diatom (Bacillariophyceae) from North Tibet, China

Phytotaxa ◽  
2019 ◽  
Vol 423 (3) ◽  
pp. 195-205 ◽  
Author(s):  
LI YANG ◽  
QING-MIN YOU ◽  
J. P. KOCIOLEK ◽  
LI-QING WANG ◽  
WEI ZHANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
North America ◽  
The Other ◽  
Central Portion ◽  
Similar Species ◽  
A New Species ◽  
Scanning Electron

A new species, Gomphosinica selincuoensis sp. nov., is described from Lake Selincuo, North Tibet, China. This taxon is clearly different from the other species in genus Gomphosinica, with a distinctly protracted, rostrate headpole, relatively higher striae density, and distinctive areolae arrangement within the striae. Striae have areolae mostly in 3 rows, but there are places near the central portion of the valve and at footpole where there are only 2 rows of areolae per stria. Characteristics of this taxon, as observed in light and scanning electron microscopy, support its systematic placement in the genus Gomphosinica. This new species is compared with similar species in Gomphosinica from China and North America, and the biogeographic distribution of the genus is discussed.

Euastrum kossinskiae: a new species of desmid from the aapa mire of the Vologda Region (European Russia)

Phytotaxa ◽  
2018 ◽  
Vol 376 (1) ◽  
pp. 77
Author(s):  
OLGA V. ANISSIMOVA ◽  
DMITRIY A. PHILIPPOV
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
European Russia ◽  
The Other ◽  
Similar Species ◽  
Vologda Region ◽  
A New Species ◽  
Scanning Electron

A new small-celled species of the genus Euastrum is described from Piyavochnoe Mire (Vologda Region, European Russia). The species was studied by light and scanning electron microscopy. This species refers to the group of Cosmarium-like species of Euastrum. This taxon is also compared to the other morphologically similar species.

The genus Navicula (Bacillariophyceae, Naviculaceae) from the valley of the Adegoy River (Krasnodar Territory, Russia) and description of two new species

Phytotaxa ◽  
2021 ◽  
Vol 494 (2) ◽  
pp. 208-218
Author(s):  
DMITRY CHUDAEV ◽  
INGRID JÜTTNER ◽  
ZLATKO LEVKOV
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
River Valley ◽  
Similar Species ◽  
Taxonomic Study ◽  
The Caucasus ◽  
Caucasus Region ◽  
Two New Species ◽  
Scanning Electron

This is the first detailed taxonomic study of the genus Navicula in the Krasnodar Territory of the Caucasus region, Russia. During the study of the genus in waterbodies of the Adegoy River valley 15 taxa were recorded. Two species, N. adegoyensis sp. nov. and N. pseudocryptofallax sp. nov., are described as new to science. Their morphology is studied by light and scanning electron microscopy, and comparisons with morphologically similar species are provided. The use of the name N. avenacea for N. lanceolata sensu auct. is discussed. Navicula diversity was higher in the Adegoy River than in pools elsewhere in the river valley.

Fragilaria irregularis sp. nov. a new araphid species (Fragilariaceae, Bacillariophyta) from the River Adegoy, Krasnodar Territory, Russia

Phytotaxa ◽  
2021 ◽  
Vol 508 (2) ◽  
Author(s):  
DMITRY CHUDAEV ◽  
INGRID JÜTTNER ◽  
BART VAN DE VIJVER
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Similar Species ◽  
New Taxon ◽  
Weakly Convex ◽  
Diatom Flora ◽  
A New Species ◽  
Scanning Electron

During a survey of the diatom flora of the Adegoy River (Krasnodar Territory, Russia), an unknown Fragilaria species (Bacillariophyta) was found that could not be identified using the currently available literature and here we describe it as a new species. The morphology of Fragilaria irregularis sp. nov. was studied using light and scanning electron microscopy and compared to similar species including Fragilaria deformis, F. rinoi, F. septentrionalis and Fragilariforma bicapitata. It differed from these taxa in several characters. Most observed valves showed an irregular striation pattern, a feature not observed in other species. Other important differences include valve outline (linear with parallel margins) and stria density (7–14 in 10 µm, lower compared to all other species). The new taxon has a linear valve outline with parallel to weakly convex margins, subcapitate apices and a very irregular, coarse striation pattern.

Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil

Phytotaxa ◽  
2014 ◽  
Vol 184 (4) ◽  
pp. 208 ◽  
Author(s):  
Priscila Izabel Tremarin ◽  
Thelma Ludwig ◽  
Lezilda Torgan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Aquatic Environments ◽  
Similar Species ◽  
Scanning Electron ◽  
Freshwater Diatom

Examination of samples from different aquatic environments from Brazil revealed the presence of a new Aulacoseira species. Aulacoseira veraluciae Tremarin, Torgan & T. Ludwig is described and illustrated with light and scanning electron microscopy, and its morphology compared with that of similar species, such as A. muzzanensis (Meister) Krammer, A. granulata (Ehrenberg) Simonsen and A. agassizii (Ostenfeld) Simonsen. The new species is characterized mainly by the straight pervalvar rows of areolae, morphology of the linking spines, shape and position of the rimoportulae on the valve mantle, deepness and thickness of the ringleiste.

Hippodonta fujiannensis sp. nov. (Bacillariophyceae), a new epipsammic diatom from the low intertidal zone, Fujian Province, China

Phytotaxa ◽  
2017 ◽  
Vol 295 (1) ◽  
pp. 77 ◽  
Author(s):  
LONG ZHAO ◽  
JIANDONG SUN ◽  
YAHUI GAO ◽  
JUNRONG LIANG ◽  
LIN SUN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Marine Environment ◽  
Intertidal Zone ◽  
Fujian Province ◽  
Single Row ◽  
Valve Morphology ◽  
Morphometric Analyses ◽  
Scanning Electron

Hippodonta fujiannensis sp. nov., a new small-sized species of Hippodonta (Bacillariophyceae), was described from the low intertidal zone, Fujian Province, China. The morphology and ultrastructure were investigated by light and scanning electron microscopy, which revealed the following results: 1) valves asymmetrical, elliptic-lanceolate to rhombic-lanceolate with non-protracted apices; 2) raphe filiform, with teardrop-shaped and closely spaced central endings; 3) striae uniseriate, evenly spaced throughout the whole valve; 4) single row of lineolae around the valve apices. In particular, this new species is characterized by its dissymmetrical valves with one special column of lineolae which is close to the raphe and positioned perpendicular to the remaining lineolae of the striae, on only one side of the valves. Hippodonta fujiannensis is epipsammic and inhabits the marine environment. Conventional morphometric analyses were employed to elucidate the differences between this new species and several taxa similar in valve morphology, and the results are discussed.

Cymbella pamirensis sp. nov. (Bacillariophyceae) from an alpine lake in the Pamir Mountains, Northwestern China

Phytotaxa ◽  
2017 ◽  
Vol 308 (2) ◽  
pp. 249 ◽  
Author(s):  
ZHONGYAN ZHANG ◽  
PATRICK RIOUAL ◽  
YUMEI PENG ◽  
XIAOPING YANG ◽  
ZHANGDONG JIN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Alpine Lake ◽  
Similar Species ◽  
Nw China ◽  
Morphometric Analyses ◽  
Morphometric Features ◽  
Pamir Mountains ◽  
Scanning Electron

This paper describes a new Cymbella species from an alpine lake in the Pamir Mountains, NW China, with the aid of light and scanning electron microscopy and morphometric analyses. The morphology of the new species, named Cymbella pamirensis, is discussed and compared to similar species. The main morphometric features distinguishing Cymbella pamirensis from similar species of Cymbella are the outline and size of the valves. Cymbella pamirensis has been observed in surface sediment and core samples from Lake Sate Baile Dikuli, an alkaline, mesotrophic lake of the Pamir Mountains.

Taxonomic revision of Brazilian Tethya (Porifera: Hadromerida) with description of four new species

2011 ◽  
Vol 91 (7) ◽  
pp. 1511-1528 ◽  
Author(s):  
Suzi M. Ribeiro ◽  
Guilherme Muricy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Taxonomic Revision ◽  
The Other ◽  
Scanning Electron

The taxonomy of the genus Tethya from Brazil is revised. Five species are described, four of which are new to science: Tethya maza, T. beatrizae sp. nov., T. nicoleae sp. nov., T. parvula sp. nov., and T. solangeae sp. nov. Five earlier records of Tethya from Brazil (T. aurantium, T. diploderma, T. maza, T. japonica and T. seychellensis) are re-evaluated and only T. maza is confirmed. The other previous records of Tethya from Brazil, viz., Tethya brasiliana, T. cyanae, T. ignis and T. rubra, have been recently described in detail using scanning electron microscopy and are also considered valid. An amendment to the nomenclature of micrasters is made, recognizing at least two different morphologies of each type of micraster (strongylasters types 1 and 2, tylasters types 1 and 2, and oxyasters types 1, 2 and 3). A neotype was designated for T. maza. With four new species described here and four previous records considered invalid the known diversity of Tethya in Brazil still remains nine species. However, its rate of endemism has increased from 44% to 89%.

Five new Achnanthidiaceae species (Bacillariophyta) from Jiuzhai Valley, Sichuan Province, Southwestern China

Phytotaxa ◽  
2019 ◽  
Vol 405 (3) ◽  
pp. 147
Author(s):  
P. YU ◽  
Q-M. YOU ◽  
W-T. PANG ◽  
Y. CAO ◽  
Q-X. WANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Light Microscopy ◽  
Southwest China ◽  
Sichuan Province ◽  
Similar Species ◽  
Separate Species ◽  
Outline Shape ◽  
Scanning Electron

Five new species are described in this study: Achnanthidium jiuzhaienis sp. nov., Achnanthidium epilithica sp. nov., Achnanthidium limosua sp. nov., Achnanthidium subtilissimum sp. nov., and Kolbesia sichuanenis sp. nov. Classification was based on light microscopy (LM) and scanning electron microscopy (SEM). A. jiuzhaienis sp. nov. belongs to the “A. pyrenaicum complex” of the genus Achnanthidium, this classification was based on certain characteristics, such as the possession of transpically-elongated areolae and deflected external distal raphe fissures. A. epilithica sp. nov., A. limosua sp. nov., and A. subtilissimum sp. nov. belong to the “A. minutissimum complex” of the genus Achnanthidium, this classification was based on certain characteristics, such as the possession of straight external distal raphe fissures and round or elliptical areolae. Kolbesia sichuanenis sp. nov. was found to belongs to the Kolbesia genus, based on its elongated areolae and striae comprised of one macroareola. All five species were sufficiently different from other similar species to be considered unique separate species based on their valve outline, shape of the axial and center areas, and density of striae of each taxon. These new species derived from the epilithic and epiphytic collections of four alkaline lakes in Jiuzhai Valley, Sichuan Province, Southwest China.

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