Nematodes of the order Rhabditida from Andalucía Oriental, Spain. The genus Cervidellus Thorne, 1937 (Cephalobidae) with additional data on C. hamatus Thorne, 1937

Nematology ◽  
2003 ◽  
Vol 5 (5) ◽  
pp. 753-776 ◽  
Author(s):  
Oleksandr Holovachov ◽  
Joaquín Abolafia ◽  
Sven Boström ◽  
Reyes Peña-Santiago
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Iberian Peninsula ◽  
Additional Data ◽  
Identification Key ◽  
Natural Areas ◽  
The Usa ◽  
Se Iberian Peninsula ◽  
Scanning Electron

AbstractThree known species of the genus Cervidellus Thorne, 1937 are described from natural areas in the SE Iberian Peninsula on the basis of light and scanning electron microscopy, viz., C. neftasiensis, C. vexilliger and C. hamatus. In addition, data on C. hamatus from the USA are given. Descriptions, measurements and illustrations, including SEM photographs, are provided for all three species. The systematics of the genus is briefly discussed and an identification key to the species is provided.

scholarly journals Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)

2012 ◽  
Vol 26 (1) ◽  
pp. 46-57 ◽  
Author(s):  
BenoÎt Loeuille ◽  
Raquel Maria Batista Souza-Souza ◽  
Vanessa Holanda Righetti Abreu ◽  
Cláudia Barbieri Ferreira Mendonça ◽  
Vania Gonçalves-Esteves
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Additional Data ◽  
Phylogenetic Reconstruction ◽  
Pollen Grains ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Quantitative Characters ◽  
Scanning Electron

In order to evaluate the significance of the pollen morphology for generic and infrageneric taxonomy of the genus Eremanthus (Vernonieae, Asteraceae), and to provide additional data for its phylogenetic reconstruction, the pollen of 20 of the 23 species of the genus was examined using light and scanning electron microscopy. Acetolysed pollen grains were measured, described, and illustrated using light microscopy, while non-acetolysed pollen grains were analyzed using scanning electron microscopy. Pollen grains of these species are isopolar, oblate-spheroidal in most of the species, more rarely prolate spheroidal or suboblate, subtriangular amb, tricolporate and subechinolophate. The variation among quantitative characters does not correlate with the macromorphological subdivision of the genus or with the generic or specific limits.

Rediscovery of the poorly known Scorzonera argyria and its relationships in Turkey

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Muhittin Dinç ◽  
Ahmet Duran ◽  
Esra Martin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Scientific Community ◽  
Additional Data ◽  
Conservation Status ◽  
Distinct Species ◽  
Turkish Flora ◽  
Vegetative Characters ◽  
Associated Species ◽  
Scanning Electron

AbstractScorzonera argyria Boiss. has been a poorly known endemic species classified within DD category of IUCN. It has not been collected since its introduction to the scientific community in 1843. Scorzonera argyria in the Turkish flora might be considered to be a synonymy of S. eriophora. Based on the specimens collected from the type locality environs, Scorzonera argyria’s detailed morphological, karyological and palynological descriptions are presented. Its two allies, S. eriophora DC. and S. pisidica Hub.-Mor., are morphologically and palynologically studied and compared to Scorzonera argyria. After the comparison conducted in the present study, S. argyria is clearly determined to be a distinct species. Consequently, in addition to some vegetative characters S. argyrea basically differs from the allied species by its typical achenes. S. argyrea and the two allied species are generally palynologically similar, but minor differences exist between them on account of their spine shapes and micro-ornamentations observed under scanning electron microscopy. The habitat S. argyrea and its typically associated species are briefly discussed. Additional data on the ecology and the conservation status of S. argyria are also given.

scholarly journals Characterization of Iberian species of the genus Pungentus Thorne & Swanger, 1936 (Nematoda, Dorylaimida, Nordiidae)

2013 ◽  
Author(s):  
Reyes Peña-Santiago ◽  
Marcel Ciobanu ◽  
Joaquin Abolafia
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Iberian Peninsula ◽  
Line Drawings ◽  
In The Wild ◽  
Scanning Electron ◽  
Cultivated Soils

Several populations of four known species of the genus Pungentus (P. clavatus, P. engadinensis, P. marietani and P. silvestris), collected in the wild and in cultivated soils from the Iberian Peninsula, are studied. Detailed redescriptions and morphometrics are presented for each species. Illustrations are provided, including line drawings, light microscopy pictures of the four species as well as scanning electron microscopy observations of P. engadinensis. The Iberian populations are compared to type and other known populations, and new data are given that provide a better characterization of these taxa. Pungentus engadinensis is the most widely distributed species in the Iberian Peninsula.

Redescription of Placodira lobata Thorne, 1937 (Rhabditida: Cephalobidae) with a discussion of the systematic position of the genus

Nematology ◽  
2011 ◽  
Vol 13 (1) ◽  
pp. 103-114 ◽  
Author(s):  
Irma Tandingan De Ley ◽  
Steven Nadler ◽  
Sven Boström ◽  
Cymphonee Robinson ◽  
Oleksandr Holovachov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phylogenetic Relationships ◽  
Molecular Data ◽  
Systematic Position ◽  
Type Specimens ◽  
The Usa ◽  
Scanning Electron

AbstractA population of Placodira lobata from the USA is described using both light and scanning electron microscopy and compared with the descriptions of the type specimens of the same species. The phylogenetic relationships of the species are inferred from molecular data and places P. lobata in a clade that unites genera with mostly simple morphology of the labial region, like Cephalobus, Acrobeloides, Heterocephalobellus and Metacrobeles, but also includes species of Zeldia and Chiloplacus.

scholarly journals Thoracic spiracular gill structure of Lipsothrix (Diptera, Limoniidae) in Britain described from scanning electron micrographs

Zoosymposia ◽  
2009 ◽  
Vol 3 (1) ◽  
pp. 77-87 ◽  
Author(s):  
GEOFFREY E. Hancock ◽  
STEPHEN M. Hewitt ◽  
ANDREW Godfrey ◽  
MARGARET Mullin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Species Identification ◽  
Electron Micrographs ◽  
Identification Key ◽  
Scanning Electron Micrographs ◽  
Larval Habitats ◽  
Gill Structure ◽  
Juvenile Stages ◽  
Scanning Electron

Recent ecological surveys have resulted in rearing examples of the five British members of the genus Lipsothrix (Diptera, Limoniidae). These have provided samples for investigating the morphology of their thoracic spiracular gill by the use of scanning electron microscopy. This reveals unique characteristics for the five species available. The differing structures may relate to varying larval habitats. A species identification key for pupae is based on features of the plastron. Information from the juvenile stages supports the placing of Lipsothrix in the Limoniinae.

scholarly journals A weighted taxonomic matrix key for species of the rotifer genus Synchaeta (Rotifera, Monogononta, Synchaetidae)

ZooKeys ◽  
2019 ◽  
Vol 871 ◽  
pp. 1-40 ◽  
Author(s):  
Tanja Wilke ◽  
Wilko H. Ahlrichs ◽  
Olaf R. P. Bininda-Emonds
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Identification Key ◽  
Diagnostic Character ◽  
Missing Information ◽  
New Approach ◽  
As Species ◽  
Weighted Matrix ◽  
First Time ◽  
Scanning Electron

A new, weighted matrix identification key for 34 largely undisputed species of Synchaeta was created with the aim of providing comparable, detailed and diagnostic character sets for each species that can be applied to live and/or preserved specimens. As part of this process, 14 species of Synchaeta were intensively re-investigated with respect to their habitus and trophi morphology using binocular, light, and scanning electron microscopy, which, together with behavioural observations, revealed several new discriminating characters. Whenever possible, missing information for any character was added for the remaining species from the literature, with the two recently described species Synchaeta arcifera and Synchaeta squamadigitata being considered for the first time in an identification key. Beyond its completeness, our key has two distinct advantages. First, the characters are supported by detailed illustrations of their respective character states whenever possible to both simplify identification and minimize any uncertainty in the descriptions themselves. Second, the new approach of weighting the characters according to their reliability, robustness and/or ease of determination was employed. This latter approach is especially advantageous for soft-bodied rotifers such as species of Synchaeta, where, for example, several external characters can be influenced by preservation and are therefore less diagnostic or reliable. Although the key is as comprehensive as possible, information for many species remains missing for many characters, thereby highlighting the need for additional comprehensive and detailed species (re-)investigations within Synchaeta.

Nematodes from the Gulf of California. Part 2. Ceramonema nasobema sp. n. (Nematoda: Ceramonematidae)

Nematology ◽  
2008 ◽  
Vol 10 (6) ◽  
pp. 835-844 ◽  
Author(s):  
Oleksandr Holovachov ◽  
Manuel Mundo-Ocampo ◽  
Irma Tandingan De Ley ◽  
Paul De Ley
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Sexual Dimorphism ◽  
Gulf Of California ◽  
Additional Data ◽  
Scanning Electron

AbstractAn unusual new ceramonematid, Ceramonema nasobema sp. n., is described using light and scanning electron microscopy. It is particularly characterised by the presence of a perioral tube projecting 5.5-7.0 μm anterior to the lips, moderately long body (0.86-1.09 mm), relatively small number of body annules (121-134), weakly developed zygapophyses, absence of intracuticular vacuoles, pronounced sexual dimorphism in amphid shape with the male ventral amphidial branch extending as far posterior as the 55-80th annule (no extension in females), barrel-shaped stoma, sigmoid and anteriorly inclined vagina without sclerotisations, gubernaculum with dorsal apophyses and relatively uniform cloacal annules. The new species differs from all other known species of Ceramonema especially by the shape of the amphid in males, the strongly projecting perioral tube and the inclined, sigmoid, vagina. Additional data on morphology of Ceramonema algoensis (from Natal Bay, South Africa) are also provided as this species has the most prominent perioral tube among previously described members of the genus.

A seed micromorphology study of Astragalus sect. Caprini (Leguminosae-Papilionoideae) from NE Iran

Phytotaxa ◽  
2015 ◽  
Vol 192 (3) ◽  
pp. 190
Author(s):  
Mohammad Reza - Saghi ◽  
Azarnoosh - Jafari ◽  
Zahra - Yazdanbakhsh
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Seed Coat ◽  
Identification Key ◽  
Seed Micromorphology ◽  
Astragalus Sect ◽  
Ne Iran ◽  
Scanning Electron

Seed micromorphology of 14 species of the Astragalus sect. Caprini from Khorasan Razavi Province (NE Iran) was studied using Scanning Electron Microscopy. Three main seed shapes, ovoid, mitiform and reniform, and four types of seed coat ornamentation, rugulate, reticulate–rugulate, velate and velate–foveolate were found. Seed micromorphology of the studied specimens was found to be variable between species. An identification key is presented based on seed coat characters.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

Ultrastructural Analysis of the Salivary Glands of Gromphadorhina Portentosa (Schaum)

1977 ◽  
Vol 35 ◽  
pp. 638-639
Author(s):  
P.J. Dailey
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Salivary Glands ◽  
Secretory Vesicles ◽  
The Past ◽  
Transmission Electron ◽  
Means Of Transmission ◽  
Gromphadorhina Portentosa ◽  
Scanning Electron ◽  
Topographical Relief

The structure of insect salivary glands has been extensively investigated during the past decade; however, none have attempted scanning electron microscopy (SEM) in ultrastructural examinations of these secretory organs. This study correlates fine structure by means of SEM cryofractography with that of thin-sectioned epoxy embedded material observed by means of transmission electron microscopy (TEM).Salivary glands of Gromphadorhina portentosa were excised and immediately submerged in cold (4°C) paraformaldehyde-glutaraldehyde fixative1 for 2 hr, washed and post-fixed in 1 per cent 0s04 in phosphosphate buffer (4°C for 2 hr). After ethanolic dehydration half of the samples were embedded in Epon 812 for TEM and half cryofractured and subsequently critical point dried for SEM. Dried specimens were mounted on aluminum stubs and coated with approximately 150 Å of gold in a cold sputtering apparatus.Figure 1 shows a cryofractured plane through a salivary acinus revealing topographical relief of secretory vesicles.

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