Diatom Genus Hyalosira (Rhabdonematales emend.) and Resolution of its Polyphyly in Grammatophoraceae and Rhabdonemataceae with a New Genus, Placosira, and Five New Hyalosira Species

Protist ◽  
2021 ◽  
pp. 125816
Author(s):  
Christopher S. Lobban ◽  
Roksana Majewska ◽  
Matt Ashworth ◽  
Nihayet Bizsel ◽  
Sunčica Bosak ◽  
...  
Keyword(s):  
New Genus ◽  
Diatom Genus

Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae

Phytotaxa ◽  
2014 ◽  
Vol 183 (2) ◽  
pp. 120
Author(s):  
PRZEMYSŁAW DĄBEK ◽  
KOEN SABBE ◽  
ANDRZEJ WITKOWSKI ◽  
COLIN ARCHIBALD ◽  
KRZYSZOF J. KURZYDŁOWSKI ◽  
...  
Keyword(s):  
New Genus ◽  
Light And Electron Microscopy ◽  
Benthic Diatom ◽  
Western Cape ◽  
Western Cape Province ◽  
Line Drawings ◽  
The Family ◽  
Diatom Genus ◽  
Electron Microscopical ◽  
First Time

We present a new marine benthic diatom genus Cymatosirella gen. nov. The genus belongs to the family Cymatosiraceae and has been assigned to the subfamily Extubocelluloideae on the basis of ultrastructural cell wall features. It has isovalvate cells with undulate valves and is characterized by the absence of tubular processes and the occurrence of hollow spines which are observed for the first time in the Cymatosiraceae. The new genus contains four species, two of which are transferred from the genus Cymatosira, viz. Cymatosirella capensis comb. nov. and Cymatosirella minutissima comb. nov., and two which are new to science, viz. Cymatosirella benguelensis sp. nov. and Cymatosirella taylorii sp. nov. Cymatosirella capensis is chosen as the generitype. The new genus includes a group of very small taxa inhabiting the intertidal zone of the Atlantic Ocean with three species in South Africa and one in Europe. C. capensis was originally described by Giffen from Langebaan Lagoon (a shallow marine inlet in the southern part of Saldanha Bay, Western Cape Province), on the basis of light microscopy only, and has to date only been illustrated by line drawings. C. minutissima, so far only known from the Westerschelde estuary (The Netherlands), has previously been documented in more detail using both light and electron microscopy. Here, we present the results of detailed light and electron microscopical investigations of C. capensis, both from its original type material and from recently collected samples from the type locality and neighboring littoral areas in the Western Cape Province, and of the new species C. benguelensis and C. taylorii, also from Western Cape localities. All species are compared with similar small taxa belonging to the Cymatosiraceae, subfamily Extubocelluloideae.

Sabbea gen. nov., a new diatom genus (Bacillariophyta) from continental Antarctica

Phytotaxa ◽  
2019 ◽  
Vol 418 (1) ◽  
pp. 42-56 ◽  
Author(s):  
JORDAN BISHOP ◽  
KATEŘINA KOPALOVÁ ◽  
JOSHUA P. DARLING ◽  
NICHOLAS O. SCHULTE ◽  
TYLER J. KOHLER ◽  
...  
Keyword(s):  
New Genus ◽  
Morphological Characteristics ◽  
Sensu Stricto ◽  
Morphological Features ◽  
Marine Diatom ◽  
Continental Antarctica ◽  
Diatom Genus ◽  
Antarctic Continent ◽  
Vestfold Hills ◽  
The Antarctic

The non-marine diatom flora of the Antarctic Continent includes several endemic taxa recorded over the past 100 years. One of these taxa, Navicula adminensis D.Roberts & McMinn, was described from the Vestfold Hills, East Antarctica. Detailed light and scanning electron microscopy observations have shown that based on its morphological features, the species does not belong to the genus Navicula sensu stricto. To determine the most closely related genera to N. adminensis, the morphological features of Adlafia, Kobayasiella, Envekadea, Stenoneis, Berkeleya, Climaconeis, and Parlibellus were compared with those of N. adminensis. Although each of these genera shows one or more similar features, none of them accommodates the salient morphological characteristics of N. adminensis. Therefore, a new genus, Sabbea gen. nov., is herein described, and Navicula adminensis is formally transferred to the new genus as Sabbea adminensis comb. nov. The genus Sabbea is characterized by uniseriate striae composed of small, rounded areolae occluded externally by individual hymenes, a rather simple raphe structure with straight, short proximal ends and short terminal raphe fissures, open girdle bands with double perforation and a very shallow mantle.

Ferocia gen. nov., a new centric diatom genus (Bacillariophyceae) from the sub-Antarctic region

Phytotaxa ◽  
2017 ◽  
Vol 332 (1) ◽  
pp. 22 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
BARBORA CHATTOVÁ ◽  
MARC LEBOUVIER ◽  
VÁCLAV HOUK
Keyword(s):  
Indian Ocean ◽  
New Genus ◽  
Southern Indian Ocean ◽  
Centric Diatom ◽  
Volcanic Island ◽  
Antarctic Region ◽  
Diatom Flora ◽  
Large Complex ◽  
Mantle Edge ◽  
Diatom Genus

A new centric diatom genus, Ferocia Van de Vijver & Houk gen. nov. is described based on Melosira setosa Greville. Several samples collected in lava tunnels on Ile Amsterdam, a small isolated, volcanic island in the southern Indian Ocean where the latter taxon dominated the diatom flora, were investigated. The new genus is characterized by having heavily silicified, spherical frustules, connected into long chains by large, complex linking spines. Valves are dome-shaped with a high mantle with rounded to irregularly shaped areolae. Numerous small rimoportulae forming a marginal ring are present near the mantle edge. The cingulum is composed of a large number of narrow, open copulae. A second species, Ferocia ninae Van de Vijver & Houk sp. nov., is described from the nearby Crozet archipelago. Besides the typical features of the genus Ferocia, the rimoportulae in F. ninae are almost equidistant, the valves have a relatively low valve height and the spines are relatively small.         Both F. ninae and F. setosa were found in shaded lava tunnels with a sparse moss vegetation. The two species are illustrated and discussed based on detailed LM and SEM observations.

Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia

Phytotaxa ◽  
2015 ◽  
Vol 217 (3) ◽  
pp. 249 ◽  
Author(s):  
Teofil Nakov ◽  
Wilson Guillory ◽  
Matthew Julius ◽  
Edward Theriot ◽  
Andrew Alverson
Keyword(s):  
New Genus ◽  
Phylogenetic Classification ◽  
Diatom Genus

Cyclotella is a commonly encountered name in the diatom literature. The name is attached, however, to a historically vaguely defined and polyphyletic genus whose taxonomy and systematics remain muddled despite numerous taxonomic treatments. One recent chapter in this history concerns species informally known as the “Cyclotella comta” group, which have one or more rimoportulae on the valve face. These species were grouped into a new genus, Puncticulata, a name that has been applied inconsistently since its introduction. The name Puncticulata eventually was shown to be illegitimate, as some species had once been classified within Handmannia, which had nomenclatural priority. An inventory of names within Cyclotella sensu lato revealed that both Puncticulata and Handmannia are later synonyms of Lindavia. We identify a rimoportula positioned on the valve face as a synapomorphy for a group of taxa with the Cyclotella comta and C. ocellata bauplans (including Pliocaenicus), and accordingly, we transfer taxa with this synapomorphy into the genus Lindavia.

Lacuneolimna gen. nov., Lacuneolimna zalokariae comb. nov. and Lacuneolimna novagallia spec. nov. (Bacillariophyceae) from the French Guiana diatom freshwater flora

Phytotaxa ◽  
2015 ◽  
Vol 231 (1) ◽  
pp. 19 ◽  
Author(s):  
Loïc Tudesque ◽  
René Le Cohu ◽  
Michel Coste ◽  
Horst Lange-Bertalot
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
New Taxa ◽  
French Guiana ◽  
New Genus ◽  
Freshwater Diatoms ◽  
Diatom Genus ◽  
Scanning Electron

The freshwater diatoms of the French Guiana have received little attention so far. A new diatom genus, Lacuneolimna, based on the species Eolimna zalokariae, is described from a small rainforest stream. Numerous ultrastructural features differ from the genus Eolimna, notably the pluriseriate striae lying between relief-like elevated virgae and depressed externally. In addition, another species new to science, L. novagallia, belonging to this new genus, was discovered in the same place. Detailed light and scanning electron microscope observations are used to characterize the morphology and the ultrastructure of these two new taxa.

Gliwiczia gen. nov. a new monoraphid diatom genus from Lake Baikal with a description of four species new for science

Phytotaxa ◽  
2013 ◽  
Vol 109 (1) ◽  
pp. 1 ◽  
Author(s):  
MAXIM KULIKOVSKIY ◽  
HORST LANGE-BERTALOT ◽  
ANDRZEJ WITKOWSKI
Keyword(s):  
Lake Baikal ◽  
New Genus ◽  
Type Material ◽  
Freshwater Lakes ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Open Circular ◽  
Diatom Genus ◽  
Scanning Electron ◽  
Sem Studies

This paper proposes a new monoraphid genus Gliwiczia Kulikovskiy, Lange-Bertalot & Witkowski, separated from Achnanthes sensu lato. Here we describe four species G. skvortzowii Kulikovskiy, Lange-Bertalot & Witkowski, G. tenuis Kulikovskiy, Lange-Bertalot & Witkowski, G. latarea Kulikovskiy, Lange-Bertalot & Witkowski and G. vixcalcar Kulikovskiy, Lange-Bertalot & Witkowski which all are new to science. In terms of morphology, this group of species closely resembles Achnanthes calcar Cleve. Also proposed is the taxonomic transfer of A. calcar Cleve to Gliwiczia calcar (Cleve) Kulikovskiy, Lange-Bertalot & Witkowski comb. nov. Our taxonomic conclusions about the position of this group of species is based on light microscopic (LM) examination of the type material of A. calcar and on extensive LM and scanning electron microscopic (SEM) studies on material originating from Lake Baikal. This new genus differs from other established monoraphid genera in the of cavum (horse shoe) present on both raphe and sternums valves, uniseriate striae on both valves, and areola occlusions in a form of open circular foramina externally. The raphe valve is only slightly concave, whereas the sternum valves appear flat. Only one of the species belonging in Gliwiczia gen. nov., G. calcar, is known to inhabit oligotrophic and dystrophic freshwater lakes of Eurasia. It seems highly likely that the newly described species are limited in their distribution to the waters of Lake Baikal. None of them have thus far been illustrated in any accessible literature even under provisional names.

scholarly journals How to define a diatom genus? Notes on the creation and recognition of taxa, and a call for revisionary studies of diatoms

2015 ◽  
Vol 74 (2) ◽  
pp. 195-210 ◽  
Author(s):  
John Patrick Kociolek ◽  
David M. Williams
Keyword(s):  
New Genus ◽  
Diatom Genus ◽  
The Creation ◽  
Important Activity

AbstractWe highlight the increase in the number of diatom genera being described, and suggest that their description be based on the concept of monophyly. That is, a new genus will contain the ancestor and all its descendants. Past criteria or guidance on how to circumscribe genera are reviewed and discussed, with conceptual and actual exemplars presented. While there is an increase in the rate of genus descriptions in diatoms, and there are many journal and series dedicated to facilitating this important activity, we call for revisionary works on diatom groups, to assess and establish monophyletic groups at all levels of hierarchy in the diatom system.

Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae

Phytotaxa ◽  
2013 ◽  
Vol 121 (1) ◽  
pp. 42 ◽  
Author(s):  
PRZEMYSŁAW DĄBEK ◽  
KOEN SABBE ◽  
ANDRZEJ WITKOWSKI ◽  
COLIN ARCHIBALD ◽  
KRZYSZOF J. KURZYDŁOWSKI ◽  
...  
Keyword(s):  
New Genus ◽  
Light And Electron Microscopy ◽  
Benthic Diatom ◽  
Western Cape ◽  
Western Cape Province ◽  
Line Drawings ◽  
The Family ◽  
Diatom Genus ◽  
Electron Microscopical ◽  
First Time

We present a new marine benthic diatom genus Cymatosirella gen. nov. The genus belongs to the family Cymatosiraceae and has been assigned to the subfamily Extubocelluloideae on the basis of ultrastructural cell wall features. It has isovalvate cells with undulate valves and is characterized by the absence of tubular processes and the occurrence of hollow spines which are observed for the first time in the Cymatosiraceae. The new genus contains four species, two of which are transferred from the genus Cymatosira, viz. Cymatosirella capensis comb. nov. and Cymatosirella minutissima comb. nov., and two which are new to science, viz. Cymatosirella benguelensis sp. nov. and Cymatosirella taylorii sp. nov. Cymatosirella capensis is chosen as the generitype. The new genus includes a group of very small taxa inhabiting the intertidal zone of the Atlantic Ocean with three species in South Africa and one in Europe. C. capensis was originally described by Giffen from Langebaan Lagoon (a shallow marine inlet in the southern part of Saldanha Bay, Western Cape Province), on the basis of light microscopy only, and has to date only been illustrated by line drawings. C. minutissima, so far only known from the Westerschelde estuary (The Netherlands), has previously been documented in more detail using both light and electron microscopy. Here, we present the results of detailed light and electron microscopical investigations of C. capensis, both from its original type material and from recently collected samples from the type locality and neighboring littoral areas in the Western Cape Province, and of the new species C. benguelensis and C. taylorii, also from Western Cape localities. All species are compared with similar small taxa belonging to the Cymatosiraceae, subfamily Extubocelluloideae.

Syvertsenia iberica (Cymatosiraceae): a new estuarine diatom genus characterized by the position of its process

Phytotaxa ◽  
2013 ◽  
Vol 142 (1) ◽  
pp. 25 ◽  
Author(s):  
ANA GOMES ◽  
ANDRZEJ WITKOWSKI ◽  
PRZEMYSŁAW DĄBEK ◽  
TOMASZ BOSKI ◽  
DELMINDA MOURA ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Distribution Pattern ◽  
New Genus ◽  
River Estuary ◽  
Morphological Similarity ◽  
Diatom Assemblages ◽  
The Family ◽  
Diatom Genus ◽  
Scanning Electron

Diatom assemblages were studied along an intertidal transect in the lower Guadiana River Estuary (South-Eastern Portugal). The analyses of the assemblages by means of light and scanning electron microscope revealed a new diatom genus and species, Syvertsenia iberica. Syvertsenia was found in three out of eighteen of the samples analysed in the transect.  The proposed new genus belongs to the family Cymatosiraceae, which is characterized by the presence of two distinct ocelluli. In common with other genera belonging to the subfamily Cymatosiroideae, the new genus shows heterovalvy and morphological similarity to Cymatosira, Campylosira and Plagiogrammopsis. In terms of ultrastructure, the features which identify these diatoms as a new genus are its linear valve outline, protracted to distinctly set off apices and also the distribution pattern of areola. Furthermore the position of the tubular process on a valve mantle extension, allows an easy distinction from other Cymatosiroideae. Syvertsenia iberica is a benthic epipsammic diatom whose ecological and geographical distribution requires more investigation. 

Description of a new fossil diatom genus, Cribrionella gen. nov. (Bacillariophyta) from Quaternary sediments of Lake Ohrid

Phytotaxa ◽  
2016 ◽  
Vol 252 (1) ◽  
pp. 31
Author(s):  
ELENA JOVANOVSKA ◽  
ALEKSANDRA CVETKOSKA ◽  
SLAVICA TOFILOVSKA ◽  
NADJA OGNJANOVA-RUMENOVA ◽  
ZLATKO LEVKOV
Keyword(s):  
Evolutionary History ◽  
New Genus ◽  
Sensu Stricto ◽  
Lake Ohrid ◽  
Quaternary Sediments ◽  
Lake Prespa ◽  
The Family ◽  
Diatom Genus ◽  
History Of ◽  
Silicate Layers

A new diatom genus, Cribrionella gen. nov., is described from Quaternary sediments of Lake Ohrid. Cribrionella comprises distinct morphological features, such as: i) presence of submarginal alveoli followed by regularly or irregularly arranged areolae, ii) cribra on external areolar openings, iii) absence of silicate layers on internal areolar openings, but presence of thick and inwardly raised circumferential silica trabeculae, iv) rimoportulae positioned on costae, and v) absence of central fultoportulae. Detailed light and scanning electron microscope analyses were undertaken and used for comparison to morphologically related genera. The typus generis Cribrionella ohridana is compared to species from its morphologically closest genus Cyclotella sensu stricto (e.g., C. atomus, C. delicatula, C. bifacialis). Cribrionella ohridana has not been reported from the extant diatom flora of Lake Ohrid, nor in the nearby Lake Prespa. The discovery of a new genus in Lake Ohrid confirms again the importance of the lake, not only in light of species richness and endemicity, but also in evolutionary history of the family Stephanodiscaceae.

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