scholarly journals A new species of Exogone Ørsted, 1845 (Annelida: Syllidae: Exogoninae) from Brazilian waters

2019 ◽  
Vol 59 ◽  
pp. e20195947 ◽  
Author(s):  
Marcelo Veronesi Fukuda ◽  
Andrezza Ribeiro Menezes-Moura ◽  
Carmen Regina Parisotto Guimarães ◽  
Christine Ruta
Keyword(s):  
New Species ◽  
The Body ◽  
Anterior Body ◽  
Electron Microscopes ◽  
Polychaete Family ◽  
Scanning Electron Microscopes ◽  
A New Species ◽  
Scanning Electron

We describe herein a new species of the abundant polychaete family Syllidae, Exogone brasiliensis sp. nov. The new species is characterized by a peculiar morphology of anterior body falcigers, with shafts and blades modified specially in chaetigers 1 and 2; falcigers until chaetiger 5 different from those of the rest of the body; and dorsal simple chaetae from midbody onwards unique in the genus, nearly straight, subdistally swollen in one side only, distally rounded. Exogone brasiliensis sp. nov. is described based on detailed morphological analyses under optical and scanning electron microscopes, and compared to its most similar congeners.

scholarly journals Isoetes pedersenii, a new species from Southern South America

2010 ◽  
Vol 82 (2) ◽  
pp. 353-359 ◽  
Author(s):  
Cecilia Macluf ◽  
Esteban I. Meza Torres ◽  
Stella M. Solís
Keyword(s):  
New Species ◽  
South America ◽  
National Park ◽  
Southern South America ◽  
Herbarium Material ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
A New Species ◽  
Scanning Electron

The name Isoetes pedersenii H.P. Fuchs (Lycophyta), a species known only from the Mburucuyá National Park, Corrientes, Argentina, is validated. Observations were carried out on herbarium material with stereoscopic, light and scanning electron microscopes. The species is described and typified. A diagnosis and discussion about its distribution and its relationship with the morphology of other species of Isoetes are provided.

A new species of Moina Baird, 1850 (Cladocera: Moinidae) from Thailand

Zootaxa ◽  
2019 ◽  
Vol 4554 (1) ◽  
pp. 199 ◽  
Author(s):  
MIGUEL ALONSO ◽  
ANNA N. NERETINA ◽  
LA-ORSRI SANOAMUANG ◽  
NUKUL SAENGPHAN ◽  
ALEXEY A. KOTOV
Keyword(s):  
New Species ◽  
Genetic Markers ◽  
Central Region ◽  
South East Asia ◽  
Tropical Asia ◽  
Distribution Ranges ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
A New Species ◽  
Scanning Electron

A new species of Moina Baird, 1850 (Cladocera: Moinidae) is described based on material collected from Thailand (South-East Asia). In tropical Asia, Moina siamensis sp. nov. could be confused easily with M. weismanni Ishikawa, 1896, because of morphological similarities in parthenogenetic females and males of both species. The outstanding difference between these two taxa concerns the structure of the ephippium in gamogenetic females, which is highly visible under light and scanning electron microscopes. The mature ephippium of M. weismanni is strongly tuberous, with distinct borders between cells, whereas the ephippium of M. siamensis sp. nov. is significantly less tuberous, with prominent longitudinal lines in its central region. Since gamogenetic females only appear sporadically in moinid populations, distribution ranges of M. siamensis sp. nov., M. weismanni and sibling taxa must be clarified precisely using genetic markers in the future. Preliminary investigations of the ephippium structure may be useful for estimating the differences between populations, thus revealing much diversity within Moinidae. 

Andrographis megamalayana (Andrographinae: Acanthaceae), a new species from the southern Western Ghats, India

Phytotaxa ◽  
2016 ◽  
Vol 244 (1) ◽  
pp. 89
Author(s):  
Gunadayalan Gnanasekaran ◽  
Subbiah Karuppusamy ◽  
Garimella Venkata Suryanarayana Murthy
Keyword(s):  
New Species ◽  
Western Ghats ◽  
Conservation Status ◽  
Seed Morphology ◽  
Southern Western Ghats ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
A New Species ◽  
Scanning Electron

Andrographis megamalayana Gnanasek., Karupp. & G.V.S. Murthy (Andrographinae: Acanthaceae), a new species from the southern Western Ghats, India, is described here with illustrations, colour photographs, relationships with its allied species and IUCN conservation status. In addition, the pollen and seed morphology have been described here using Light and Scanning Electron Microscopes.

scholarly journals Balantidium grimi n. sp. (Ciliophora, Litostomatea), a new species inhabiting the rectum of the frog Quasipaa spinosa from Lishui, China

Parasite ◽  
2018 ◽  
Vol 25 ◽  
pp. 29 ◽  
Author(s):  
Weishan Zhao ◽  
Can Li ◽  
Dong Zhang ◽  
Runqiu Wang ◽  
Yingzhen Zheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phylogenetic Analysis ◽  
New Species ◽  
Body Shape ◽  
Ssu Rdna ◽  
The Body ◽  
Molecular Phylogenetic ◽  
A New Species ◽  
Scanning Electron

Balantidium grimi n. sp. is described from the rectum of the frog Quasipaa spinosa (Amphibia, Dicroglossidae) from Lishui, Zhejiang Province, China. The new species is described by both light microscopy (LM) and scanning electron microscopy (SEM), and a molecular phylogenetic analysis is also presented. This species has unique morphological features in that the body shape is somewhat flattened and the vestibulum is “V”-shaped, occupying nearly 3/8 to 4/7 of the body length. Only one contractile vacuole, situated at the posterior body, was observed. The phylogenetic analysis based on SSU-rDNA indicates that B. grimi groups together with B. duodeni and B. entozoon. In addition, the genus Balantidium is clearly polyphyletic.

Encyonema aquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov.: two new freshwater diatom species (Cymbellales, Bacillariophyceae) from an oligotrophic reservoir in southeastern Brazil

Phytotaxa ◽  
2016 ◽  
Vol 247 (1) ◽  
pp. 62 ◽  
Author(s):  
Gisele Carolina Marquardt ◽  
Angélica Cristina Righetii Da Rocha ◽  
Carlos Eduardo Wetzel ◽  
Luc Ector ◽  
Carlos Eduardo de Mattos Bicudo
Keyword(s):  
New Species ◽  
Surface Sediments ◽  
Low Ph ◽  
Southeastern Brazil ◽  
Diatom Species ◽  
Southeast Brazil ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron ◽  
Freshwater Diatom

Recent research of the plankton and the surface sediments from Ribeirão do Campo reservoir (São Paulo, southeast Brazil) led to identification of two new cymbelloid diatom species: Encyonema acquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov. Their morphology was studied under both light and scanning electron microscopes aiming at describing the two species in detail. The morphology of each species is compared and discussed with morphologically similar taxa. The new species are different from all others in the Cymbellales due to a combination of characteristics including valve outline, striae, areolae structure, and raphe system. Both species were collected from an oligotrophic environment with both low pH and conductivity.

A new species in the genus Alopecosa Simon, 1885 from Korea (Araneae: Lycosidae)

Zootaxa ◽  
2004 ◽  
Vol 397 (1) ◽  
pp. 1 ◽  
Author(s):  
JUNGSUN YOO ◽  
JOOPIL KIM ◽  
HOZUMI TANAKA
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Body Size ◽  
Scanning Electron Microscope ◽  
Morphological Characteristics ◽  
The Body ◽  
Similar Species ◽  
A New Species ◽  
Scanning Electron

Alopecosa volubilis n. sp. is described from Korea and is differentiated from other species in Alopecosa Simon, 1885 by morphological characteristics, such as three retromarginal teeth of chelicera, smaller body size, and the presence of a distinct tip of the median apophysis. The pedipalpal sclerites and somatic characters of two similar species, A. moriutii Tanaka, 1985 and A. hokkaidensis Tanaka, 1985, are compared with those of the new species. An illustration of the body and scanning electron microscope (SEM) pictures of the pedipalpal organ are provided.

scholarly journals A new species of Cosmocerca (Nematoda, Ascaridomorpha) from the marine toad Rhinella marina (Linnaeus) (Anura, Bufonidae) in Australia

ZooKeys ◽  
2020 ◽  
Vol 931 ◽  
pp. 11-20
Author(s):  
Xue-Feng Ni ◽  
Diane P. Barton ◽  
Hui-Xia Chen ◽  
Liang Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Present Knowledge ◽  
The Body ◽  
Amphibian Species ◽  
Rhinella Marina ◽  
A New Species ◽  
Scanning Electron ◽  
Nematode Fauna

The marine toad Rhinella marina (Linnaeus) (Anura, Bufonidae) is a notorious, exotic amphibian species in Australia. However, our present knowledge of the composition of the nematode fauna of R. marina is still not complete. In the present study, a new cosmocercid nematode, Cosmocerca multipapillatasp. nov., was described using both light and scanning electron microscopy, based on specimens collected from R. marina in Australia. Cosmocerca multipapillatasp. nov. can be easily distinguished from its congeners by the body size, the presence of lateral alae and well sclerotized gubernaculum, the number and arrangement of plectanes and rosettes and the length of spicules, oesophagus and tail.

Morphology of some fossil lacustrine centric species from the western United States assigned to the genus Cyclotella (Bacillariophyta), including four described as new

Phytotaxa ◽  
2013 ◽  
Vol 127 (1) ◽  
pp. 81 ◽  
Author(s):  
J. P. KOCIOLEK ◽  
G. K. KHURSEVICH
Keyword(s):  
United States ◽  
New Species ◽  
Central Area ◽  
Morphological Features ◽  
Western United States ◽  
Fossil Species ◽  
Centric Diatoms ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron

During consideration of fossil centric diatoms from a variety of non-marine localities in the western USA, we encountered four new species and two previously known taxa that should be assigned to the genus Cyclotella (F.T. Kützing) A. de Brébisson. We detail the morphological features of these species, and discuss their relevance to other members of the Cyclotella. These fossil species are studied in light and scanning electron microscopes, and can be assigned to several morphological groups with respect mainly to the structure of alveolae as well as positon(s) of rimoportula(e) and marginal fultoportulae. Presence of loculate areolae with internal domed cribra and external foramina, or both areolae and valve face fultoportulae in the central area are characteristics found in all of these Cyclotella taxa.

Current State of Biological High-Resolution Scanning Electron Microscopy

1988 ◽  
Vol 46 ◽  
pp. 180-181 ◽  
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
High Performance ◽  
Low Voltage ◽  
Backscattered Electrons ◽  
Lens Position ◽  
Low Voltage Operation ◽  
Signal Collection ◽  
Probe Size ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Scanning Electron

A new generation of high performance field emission scanning electron microscopes (FSEM) is now commercially available (JEOL 890, Hitachi S 900, ISI OS 130-F) characterized by an "in lens" position of the specimen where probe diameters are reduced and signal collection improved. Additionally, low voltage operation is extended to 1 kV. Compared to the first generation of FSEM (JE0L JSM 30, Hitachi S 800), which utilized a specimen position below the final lens, specimen size had to be reduced but useful magnification could be impressively increased in both low (1-4 kV) and high (5-40 kV) voltage operation, i.e. from 50,000 to 200,000 and 250,000 to 1,000,000 x respectively.At high accelerating voltage and magnification, contrasts on biological specimens are well characterized1 and are produced by the entering probe electrons in the outmost surface layer within -vl nm depth. Backscattered electrons produce only a background signal. Under these conditions (FIG. 1) image quality is similar to conventional TEM (FIG. 2) and only limited at magnifications >1,000,000 x by probe size (0.5 nm) or non-localization effects (%0.5 nm).

Observation of GaAs/AlAs Superlattice Structures in both Secondary and Backscattcred Electron Imaging Modes with an Ultrahigh Resolution Scanning Electron Microscope

1990 ◽  
Vol 48 (1) ◽  
pp. 404-405
Author(s):  
K. Ogura ◽  
A. Ono ◽  
S. Franchi ◽  
P.G. Merli ◽  
A. Migliori
Keyword(s):  
Gaas Layer ◽  
Objective Lens ◽  
Superlattice Structure ◽  
Backscattered Electron ◽  
Instrumental Resolution ◽  
Electron Microscopes ◽  
Superlattice Structures ◽  
Electron Imaging ◽  
Scanning Electron Microscopes ◽  
Scanning Electron

In the last few years the development of Scanning Electron Microscopes (SEM), equipped with a Field Emission Gun (FEG) and using in-lens specimen position, has allowed a significant improvement of the instrumental resolution . This is a result of the fine and bright probe provided by the FEG and by the reduced aberration coefficients of the strongly excited objective lens. The smaller specimen size required by in-lens instruments (about 1 cm, in comparison to 15 or 20 cm of a conventional SEM) doesn’t represent a serious limitation in the evaluation of semiconductor process techniques, where the demand of high resolution is continuosly increasing. In this field one of the more interesting applications, already described (1), is the observation of superlattice structures.In this note we report a comparison between secondary electron (SE) and backscattered electron (BSE) images of a GaAs / AlAs superlattice structure, whose cross section is reported in fig. 1. The structure consist of a 3 nm GaAs layer and 10 pairs of 7 nm GaAs / 15 nm AlAs layers grown on GaAs substrate. Fig. 2, 3 and 4 are SE images of this structure made with a JEOL JSM 890 SEM operating at an accelerating voltage of 3, 15 and 25 kV respectively. Fig. 5 is a 25 kV BSE image of the same specimen. It can be noticed that the 3nm layer is always visible and that the 3 kV SE image, in spite of the poorer resolution, shows the same contrast of the BSE image. In the SE mode, an increase of the accelerating voltage produces a contrast inversion. On the contrary, when observed with BSE, the layers of GaAs are always brighter than the AlAs ones , independently of the beam energy.

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