Planothidium incuriatum sp. nov. a widely distributed diatom species (Bacillariophyta) and type analysis of Planothidium biporomum

Phytotaxa ◽  
2013 ◽  
Vol 138 (1) ◽  
pp. 43 ◽  
Author(s):  
CARLOS E. WETZEL ◽  
BART VAN DE VIJVER ◽  
LUCIEN HOFFMANN ◽  
LUC ECTOR
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
North America ◽  
South America ◽  
Related Species ◽  
Type Material ◽  
Diatom Species ◽  
Type Analysis ◽  
The World ◽  
Scanning Electron

Planothidium incuriatum sp. nov. is described from freshwater samples from Europe and South America. It is compared with the type material of Achnanthes biporoma (=Planothidium biporomum), described from North America, to differentiate it from the new, related species. Species morphologies were compared using both light and scanning electron microscopy. Planothidium incuriatum can be differentiated from P. biporomum by its valve outline with more rostrate apices (instead of capitate) and by the areolation pattern of the striae in the raphe less valve (higher number of rows of areolae per stria). Distribution of P. incuriatum was determined from worldwide iconographic literature records where it was often identified as Planothidium biporomum among other names here detailed. While P. incuriatum appears to be widely distributed around the world, P. biporomum is, according to verified records, far more restricted.

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.

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.

Analysis of type material of Opephora pacifica and emendation of the genus Opephora (Bacillariophyta)

2021 ◽  
Vol 64 (1) ◽  
pp. 55-69
Author(s):  
Eduardo A. Morales ◽  
Carlos E. Wetzel ◽  
Luc Ector ◽  
Bart Van de Vijver
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Related Species ◽  
Morphological Diversity ◽  
Monophyletic Group ◽  
Type Material ◽  
Closely Related Species ◽  
Infraspecific Taxa ◽  
Scanning Electron

Abstract The genus Opephora currently contains 37 species and 27 infraspecific taxa. However, the existing literature reveals a wide morphological diversity and the need to establish defining characters to circumscribe the genus as a cohesive and, perhaps, monophyletic group. The type material of Opephora pacifica, the generitype, is analysed. We emend the description of both the species and the genus, the latter also based on published light and scanning electron microscopy observations of closely related species. After review of the available literature, we determined that currently only two species can be ascribed with certainty to the genus Opephora: O. pacifica and O. marina. Based on available literature, it is highly likely that O. fragilarioides also belongs to this genus. We present a table with all known species and infraspecific taxa and make comments regarding their recent transfer to other genera, their current accepted nomenclature, and the genus to which they should probably be ascribed pending the collection of further information.

scholarly journals Range extension of the invasive Potamopyrgus antipodarum (Gray, 1843) (Gastropoda, Tateidae) in Chile, and a summary of its distribution in the country

Check List ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 621-626 ◽  
Author(s):  
Gonzalo A. Collado ◽  
Carmen G. Fuentealba
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Zealand ◽  
South America ◽  
River Basin ◽  
Dna Barcode ◽  
Potamopyrgus Antipodarum ◽  
Range Extension ◽  
First Time ◽  
Scanning Electron

The New Zealand mudsnail Potamopyrgus antipodarum (Gray, 1843) has been considered as one of the most invasive mollusks worldwide and recently was listed among the 50 most damaging species in Europe. In the present paper, we report for the first time the presence of P. antipodarum in the Maule river basin, Chile. The identity of the species was based on anatomical microdissections, scanning electron microscopy comparisons, and DNA barcode analysis. This finding constitutes the southernmost record of the species until now in this country and South America.

A new species of Neidiomorpha (Bacillariophyceae) from Dianshan Lake in Shanghai, China

Phytotaxa ◽  
2019 ◽  
Vol 423 (2) ◽  
pp. 99-104
Author(s):  
FEN LUO ◽  
QI YANG ◽  
KAIJUAN GUO ◽  
TENGTENG LIU ◽  
QUANXI WANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Central Area ◽  
Diatom Species ◽  
Dianshan Lake ◽  
A New Species ◽  
Scanning Electron

A new diatom species, Neidiomorpha dianshaniana sp. nov., found in Dianshan Lake in Shanghai, China, is described herein. The morphology of N. dianshaniana has been documented by light and scanning electron microscopy. Neidiomorpha dianshaniana valves are elliptical in outline with rostrate apices. Raphe is almost straight and filiform. The axial area is narrow and linear. The central area is small, round to transversely elliptical or irregular. Striae are slightly radiate and almost parallel near the apices. Puncta are arranged in undulating longitudinal rows. Neidiomorpha dianshaniana’s most visible feature is its lack of central constriction, in which respect it differs from the three other species in the genus Neidiomorpha.

Four new Luticola taxa (Bacillariophyta) from Maritime Antarctica 

Phytotaxa ◽  
2014 ◽  
Vol 170 (3) ◽  
pp. 155 ◽  
Author(s):  
RALITSA ZIDAROVA ◽  
ZLATKO LEVKOV ◽  
BART VAN DE VIJVER
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Taxa ◽  
Similar Species ◽  
The South ◽  
Maritime Antarctica ◽  
World Data ◽  
The World ◽  
Scanning Electron

The paper describes four new Luticola taxa from the South Shetland Archipelago, Antarctica:  Luticola neglecta sp. nov., L. bogaertsiana sp. nov., L. contii sp. nov. and L. olegsakharovii sp. nov. All new taxa are studied using both light and scanning electron microscopy and compared to other morphologically similar species from (sub-)Antarctica and elsewhere in the world. Data on their ecology and biogeography are added. 

Cocconeis kurakakea, a new diatom species from Nukutavake (Tuamotu Archipelago, South Pacific): description and comparison with C. diruptoides and C. pseudodiruptoides

Phytotaxa ◽  
2018 ◽  
Vol 349 (2) ◽  
pp. 115 ◽  
Author(s):  
CATHERINE RIAUX-GOBIN ◽  
ANDRZEJ WITKOWSKI ◽  
RICHARD W. JORDAN ◽  
VALERIANO PARRAVICINI ◽  
SERGE PLANES
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
South Pacific ◽  
Benthic Diatom ◽  
New Taxon ◽  
Diatom Species ◽  
The South ◽  
Standard Methods ◽  
Tuamotu Archipelago ◽  
Scanning Electron

During the ‘Tara Pacific 2016–2018 Expedition’, marine benthic diatom samples were collected from several Tuamotu atolls in the South Pacific. Preparation and examination of these samples were conducted following standard methods including light and scanning electron microscopy. A small-celled taxon from the genus Cocconeis Ehrenb. (Bacillariophyceae) is described from the Nukutavake reef, and compared to several other taxa for which the definition is not always clear (e.g., Cocconeis diruptoides Hust. and Cocconeis pseudodiruptoides Foged). The new taxon is present only on one of the investigated Tuamotu atolls, possibly indicating local endemism.

scholarly journals Taxonomic synthesis of the eastern North American millipede genus Pseudopolydesmus (Diplopoda: Polydesmida: Polydesmidae), utilizing high-detail ultraviolet fluorescence imaging

2019 ◽  
Vol 187 (1) ◽  
pp. 117-142 ◽  
Author(s):  
Petra Sierwald ◽  
Derek A Hennen ◽  
Xavier J Zahnle ◽  
Stephanie Ware ◽  
Paul E Marek
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fluorescence Imaging ◽  
North American ◽  
Type Material ◽  
High Quality ◽  
Subjective Synonym ◽  
Scanning Electron

Abstract The species of the eastern North American millipede genus Pseudopolydesmus are reviewed. Synonyms and comprehensive literature citations are provided for each of the eight recognized species. Diagnostic morphology of the genus, including clarification of male gonopod terminology, is reviewed and defined using scanning electron microscopy and high-quality macrophotographic images, including those in which ultraviolet fluorescence was induced to produce detailed images of morphological structures. Based on the examination of available type material, the following eight species are recognized: (1) Pseudopolydesmus erasus; (2) Pseudopolydesmus canadensis; (3) Pseudopolydesmus collinus; (4) Pseudopolydesmus pinetorum; (5) Pseudopolydesmus minor; (6) Pseudopolydesmus caddo; (7) Pseudopolydesmus paludicolus; and (8) Pseudopolydesmus serratus. The species names Polydesmus neoterus and Polydesmus euthetus are here placed as junior subjective synonyms of Ps. minor (both syn. nov.), and Polydesmus natchitoches is placed as a junior subjective synonym of Ps. pinetorum (syn. nov.).

Navicula gogorevii—a new, large-celled diatom species from Vietnam (Southeast Asia)

Phytotaxa ◽  
2020 ◽  
Vol 428 (1) ◽  
pp. 60-66
Author(s):  
MAXIM KULIKOVSKIY ◽  
DMITRY CHUDAEV ◽  
ANTON GLUSHCHENKO ◽  
IRINA KUZNETSOVA ◽  
ZINAIDA KRIVOVA ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Characteristic Feature ◽  
Southeast Asia ◽  
Sensu Stricto ◽  
Diatom Species ◽  
Scanning Electron

We describe a new member from the genus Navicula Bory sensu stricto using light and scanning electron microscopy. The new species was found in Vietnam, and is a large-celled species with longitudinal grooves present on the valve exterior. Taxa sharing this feature are known from the genus Navicula, as well as the genera Haslea Simonsen, Craticula Grunow, Gyrosigma Hassall and Proschkinia Karajeva. The new species from Vietnam is compared with other, similar taxa of Navicula, and comments are presented about the systematics and biogeography of the group of Navicula species with this characteristic feature.

Brachysira aristidesii sp. nov. (Bacillariophyceae, Brachysiraceae): a new species from oligotrophic and mesotrophic tropical reservoirs in southeastern Brazil

Phytotaxa ◽  
2020 ◽  
Vol 456 (1) ◽  
pp. 105-113
Author(s):  
STÉFANO ZORZAL-ALMEIDA ◽  
ELAINE C. RODRIGUES BARTOZEK ◽  
EDUARDO A. MORALES ◽  
DENISE C. BICUDO
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
High Water ◽  
Southeastern Brazil ◽  
Diatom Species ◽  
Tropical Reservoirs ◽  
A New Species ◽  
Piracicaba River ◽  
Scanning Electron

A new diatom species, Brachysira aristidesii sp. nov., is described from three oligotrophic and mesotrophic reservoirs in Piracicaba River basin, State of São Paulo, Brazil. Descriptions are based on light and scanning electron microscopy. The new species is mainly characterized by rhombic-lanceolate valves with strongly capitated ends, filiform and straight raphe, narrow and linear axial area, slightly radiate striae and transapically elongated areolae. It is compared to Brachysira microcephala, B. silvicola, B. vitrea, B. neoexilis and Nupela brachysiroides. Our findings suggest that Brachysira aristidesii is a species mainly associated to high water transparency, low to moderate conductivity, slightly acidic and low nutrient environments.

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