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.

On Luticola Mann (Bacillariophyceae) in southeastern Brazil: taxonomy, ecology and description of two new species

Phytotaxa ◽  
2019 ◽  
Vol 402 (4) ◽  
pp. 165 ◽  
Author(s):  
ANGELA MARIA DA SILVA-LEHMKUHL ◽  
THELMA ALVIM VEIGA LUDWIG ◽  
PRISCILA IZABEL TREMARIN ◽  
DENISE DE CAMPOS BICUDO
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Southeastern Brazil ◽  
Similar Species ◽  
Diatom Species ◽  
Sem Images ◽  
New Information ◽  
Two New Species ◽  
First Time ◽  
Scanning Electron

In the present study, we analyzed the taxonomy and ecology of fourteen species of Luticola registered in oligo- to hypereutrophic reservoirs of southeastern Brazil. Two new species were described using light and scanning electron microscopy. Luticola bartolomeii sp. nov. and Luticola iporangensis sp. nov. are distinguished from morphologically similar species by a combination of valve outline and dimensions. In addition, L. bartolomeii showed occluded isolated areolae that have a different shape and location, hitherto not observed in other Luticola species. We also compared the morphology of the new species with similar taxa and provided information on their ecological preferences. Luticola panamaensis is first recorded in Brazil, and another eight species are recorded for the first time for the state of São Paulo. This study expanded the distribution of species and added new information to the ecology of Luticola, as well as provided the first SEM images for some already known species. Information on the co-occurrence of other diatom species in the samples is also included.

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.

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.

Comparison of two new species of astogloia Bacillariophyceae) with other small members of section Ellipticae

Phytotaxa ◽  
2013 ◽  
Vol 126 (1) ◽  
pp. 1 ◽  
Author(s):  
CHIARA PENNESI ◽  
MICHEL POULIN ◽  
FRIEDEL HINZ ◽  
TIZIANA ROMAGNOLI ◽  
MARIO DE STEFANO ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Geographical Distribution ◽  
New Taxa ◽  
Related Species ◽  
The World ◽  
Two New Species ◽  
Scanning Electron

In this study, seven Mastogloia species belonging of the section Ellipticae are morphologically described through scanning electron microscopy, including two new taxa M. matthaei and M. stellae. They were collected as epiphytes on seagrasses from several tropical (Indonesia), subtropical (Egypt, Greece, Republic of Malta, Turkey) and temperate (Slovenia, Italy) regions of the world. All these species show typical characters of the Hustedt’s section Ellipticae: elliptical valve outline, a flat valve surface and rounded apices. Moreover, this study provides novel information on the frustule ultrastructure and gives update of their current geographical distribution. Some nomenclatural inconsistencies have been resolved with the typification of M. ovulum and the related species, M. emarginata, from the original Miang Besar material in the Hustedt collection.

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.

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.

A new marine epiphytic diatom species, Halamphora yundangensis sp. nov. (Bacillariophyceae), from Yundang Lake, Southeast coast of China

Phytotaxa ◽  
2020 ◽  
Vol 450 (2) ◽  
pp. 209-218
Author(s):  
WEIWEI WU ◽  
HUINA LIN ◽  
VISHAL PATIL ◽  
JOHN PATRICK KOCIOLEK ◽  
LIN SUN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Similar Species ◽  
Dorsal Margin ◽  
Ventral Margin ◽  
Diatom Species ◽  
Green Seaweed ◽  
A New Species ◽  
Scanning Electron

Halamphora yundangensis sp. nov. is described as a new species epiphytic on the green seaweed Ulva lactuca, from Yundang Lake, Fujian Province, China. Morphological details of the new species with respect to shape, size and valve ultrastructure are presented, with observations based on light microscopy (LM) and scanning electron microscopy (SEM). The main features of Halamphora yundangensis are dorsiventral, semi-lanceolate valves with convex dorsal margin and straight ventral margin, as well as valve ends distinctly protracted and capitate. Externally, a prominent marginal ridge forming the image of a broad hyaline area is present. Internally, dorsal striae are regularly biseriate, and a row of areolae lies along raphe. The new species is compared with similar species in both Amphora and Halamphora.

New phytoptids (Eriophyoidea, Phytoptidae) from southern African endemic dicotyledons: description of two new species of Solenocristus n. g. and updated key to world genera of the tribe Sierraphytoptini

2018 ◽  
Vol 23 (7) ◽  
pp. 1290 ◽  
Author(s):  
Philipp Chetverikov ◽  
Charnie Craemer ◽  
Stefan Neser ◽  
Sarah Zukoff
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Western Cape ◽  
The World ◽  
Two New Species ◽  
Temperature Scanning ◽  
Scanning Electron ◽  
Conventional Light Microscopy

A new phytoptid genus and two new species, Solenocristus karooensis n. g. & n. sp. and S. searsius n. sp. (Phytoptidae, Sierraphytoptinae, Sierraphytoptini), were collected in the Eastern and Western Cape provinces of South Africa, from southern African endemic dicotyledonous trees Schotia afra (Fabaceae) and Searsia lucida (Anacardiaceae) respectively. They are described and illustrated with the aid of conventional light microscopy and low temperature scanning electron microscopy. Females of both new species possess a distinct pregenital plate divided into two parts by a subcuticular medial ridge. Additionally, in S. karooensis n. sp. the movable digit of the male chelicerae varies in length: among six observed males, three males had a movable digit (md) twice shorter than the fixed digit (fd), in one male it was slightly shorter than fd and in the remaining two males md and fd were of the same length. An updated key to the world genera of the tribe Sierraphytoptini is given. The key incorporates data on seven sierraphytoptine genera including three genera (Neoprothrix Reis & Navia, Solenoplatilobus Chetverikov & Craemer and Solenocristus n. g.) which were described since the last generic key of Eriophyoidea by Amrine et al. (2003) was published.

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.

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