scholarly journals Studies on the genus Setaria Viborg, 1795 in South Africa. III. Setaria thwaitei Mönnig, 1933

2004 ◽  
Vol 71 (2) ◽  
Author(s):  
R. Watermeyer ◽  
J. Boomker ◽  
J.F. Putterill
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
Original Description ◽  
Valid Species ◽  
The North ◽  
Roan Antelope ◽  
Hippotragus Equinus ◽  
North And South ◽  
Scanning Electron

Mönnig (1933) described Setaria thwaitei from a sable antelope, Hippotragus niger, the type host, as well as from roan antelope, Hippotragus equinus, and waterbuck, Kobus ellipsiprymnus. Yeh (1959) considered Setaria thwaitei to be synonym of Setaria hornbyi. Material collected from roan antelopes, sable antelopes and gemsbuck, Oryx gazella, from several localities in the north and south of South Africa, together with Mönnig's (1933) material, were re-examined. Measurements of the adult worms obtained in this study were compared with those in the original description of the species. Scanning electron microscopy of the anterior and posterior regions of the female worms confirmed S. thwaitei as a valid species.

On Filipinodiaptomus Lai, Mamaril Sr. & Fernando, 1979 (Calanoida, Diaptomidae): redescription and re-allocation of the Philippine endemic Diaptomus vexillifer Brehm, 1933

Crustaceana ◽  
2019 ◽  
Vol 92 (5) ◽  
pp. 513-536
Author(s):  
Huiming Li ◽  
Shea K. P. Guinto ◽  
Rey D. S. Papa ◽  
Bo-Ping Han ◽  
Francis S. Magbanua ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Original Description ◽  
Type Locality ◽  
Morphological Comparison ◽  
Endemic Genus ◽  
Mtcoi Gene ◽  
Scanning Electron

Abstract The original description of Diaptomus vexillifer Brehm, 1933, endemic to Lake Danao (Leyte Island), was elementary and lacking taxonomically satisfactory characters. In this paper, we redescribe the Philippine-endemic genus Filipinodiaptomus Lai, Mamaril Sr. & Fernando, 1979 and the species D. vexillifer collected from its type locality, using light and scanning electron microscopy and an analysis of the mtCOI gene and the ITS of the nuclear 18S operon. We found that D. vexillifer is the second species under this endemic genus. A neotype and paraneotypes are hereby designated. Also a detailed morphological comparison is made between Filipinodiaptomus vexillifer (Brehm, 1933) comb. nov. and Filipinodiaptomus insulanus (Wright, 1928). Their taxonomic characters, interspecies relationship, and biogeography are likewise discussed.

scholarly journals On cestode and digenean parasites of Clarias gariepinus (Burchell, 1822) from the Rietvlei Dam, South Africa

2006 ◽  
Vol 73 (2) ◽  
Author(s):  
M. Barson ◽  
A. Avenant-Oldewage
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
New Record ◽  
Histological Analysis ◽  
Clarias Gariepinus ◽  
Host Fish ◽  
Mean Intensity ◽  
Anterior Intestine ◽  
Scanning Electron

Sharptooth catfish, Clarias gariepinus, from the Rietvlei Dam near Pretoria, South Africa were examined for internal platyhelminth parasites. Two adult cestodes, Polyonchobothrium clarias (stomach) (prev alence 71 %, mean intensity = 5, n = 7) and Proteocephalus glanduliger (anterior intestine) (prevalence 14 %, mean intensity = 2, n = 7), were found in the gut while metacercariae of one larval digenean, Ornithodiplostomum sp. (prevalence 14 %, mean intensity = 140, n = 7), were found encysted in the muscles. The morphology of these species, based on light and scanning electron microscopy as well as histological analysis, and how they differ from previously described specimens, are discussed. Ornithodiplostomum is a new record in southern Africa. Infection levels of the host fish were mild compared to records from previous surveys.

New data on the morphology of Comephoronema oschmarini (Nematoda, Cystidicolidae), a little-known gastrointestinal parasite of Lota lota (Teleostei) in Palaearctic Eurasia

2007 ◽  
Vol 52 (2) ◽  
Author(s):  
František Moravec ◽  
Vladimíra Hanzelová ◽  
Daniel Gerdeaux
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Morphological Features ◽  
Valid Species ◽  
Lake Geneva ◽  
Gastrointestinal Parasite ◽  
Intensity Of Infection ◽  
Lota Lota ◽  
Scanning Electron

AbstractThe nematode Comephoronema oschmarini Trofimenko, 1974 (Cystidicolidae) was found in the stomach of the burbot Lota lota (Linnaeus) of Lake Geneva, Savoy, France, collected on 23 March 2000 [prevalence 60% (3/5); intensity of infection 2–66 (mean 35)]. This material made it possible to study in detail the morphology of this so far little-known parasite, using both light and scanning electron microscopy (the latter not previously used for this species). The SEM examination showed taxonomically important morphological features, not previously reported, including the presence of distinct terminal pseudolabial projections (protuberances), four submedian labia, four bilobed submedian sublabia, and only four cephalic papillae. Deirids were found to be bifurcated. A description of the true arrangement of the two last pairs of minute caudal papillae and phasmids in the male is given. Species of Compehoronema Layman, 1933 are considered to be closely related to those of Ascarophis van Beneden, 1871. A key to valid species of Comephoronema is provided.

Redescription of Lamproglena Clariae Fryer, 1956 (Copepoda, Lernaeidae), With Notes On Its Occurrence and Distribution

Crustaceana ◽  
1996 ◽  
Vol 69 (4) ◽  
pp. 509-523 ◽  
Author(s):  
A. Avenant-Oldewage ◽  
Hazel M. Marx
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
National Park ◽  
Kruger National Park ◽  
Gill Parasite ◽  
Morphological Findings ◽  
Olifants River ◽  
First Time ◽  
Scanning Electron

AbstractThe morphology of the gill parasite Lamproglena clariae Fryer, 1956, from the Olifants River, Kruger National Park, South Africa, was studied with the aid of light and scanning electron microscopy. Ultrastructural details of all appendages are given as well as a table and map with information on the occurrence and distribution of L. clariae in Africa. Important morphological findings include: the observation of only one claw on the maxilla; first time findings and descriptions of the nuchal organ, upper and lower lips, the fifth pair of legs and circular openings on all appendages.

scholarly journals Detailed morphological description of Habronema clarki Foster & Chitwood, 1937, a nematode parasite of capybaras Hydrochoerus hydrochaeris (Linnaeus, 1766) in Brazil

2014 ◽  
Vol 23 (2) ◽  
pp. 251-254
Author(s):  
Estevam Guilherme Lux Hoppe ◽  
José Hairton Tebaldi ◽  
Daniel Fontana Ferreira
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nematode Parasite ◽  
Morphological Data ◽  
Valid Species ◽  
Morphological Description ◽  
Hydrochoerus Hydrochaeris ◽  
Scanning Electron

The genus Habronema has four valid species, of which only two are properly known. The present study aimed to describe in detail the morphology of Habronema clarki through optical and scanning electron microscopy analyses. Our results showed that the labial morphology of this parasite is closer to H. muscae than to H. microstoma. Even so, the characteristic pseudolabia and the slightly convex border of the dorsal and ventral lips are sufficient to distinguish these nematodes. Additional morphological data are presented, thus contributing to the knowledge on this little known nematode. In addition, this study provides new locality records for this species.

A new species of Acanthella Schmidt, 1862 (Porifera, Demospongiae, Dictyonellidae) from northeast region, Brazil

Zootaxa ◽  
2019 ◽  
Vol 4555 (2) ◽  
pp. 291
Author(s):  
ELIELTON NASCIMENTO ◽  
THAYNÃ CAVALCANTI ◽  
ULISSES PINHEIRO
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Light Microscopy ◽  
Valid Species ◽  
Taxonomic Identification ◽  
Herbaceous Species ◽  
Northeast Region ◽  
A New Species ◽  
Scanning Electron

Acanthella Schmidt, 1862 species are characterized by choanosomal skeleton of dendritic tracts cored by interwoven sinuously bent strongyles or strongyloxeas and echinated by straight styles, oxeas or anisoxeas (Van Soest et al. 2002). The genus Acanthella comprises 33 valid species, with six known from the Atlantic Ocean (Van Soest et al. 2018). Previously, the only record for Brazil was A. flagelliformis (Van Soest & Stentoft, 1988) (Muricy 2018). Species of the genus include a transition from shrub like ‘Axinellas’ and herbaceous species similar to the genus Suberites Nardo, 1833 (Schmidt 1862; Vosmaer 1912). Due to its heterogeneous complex of species, Acanthella has been confused with other axinellids. Similarities were seen in genera such as Phakellia (Van Soest et al. 2002), which shares spicule complement and comparable choanosomal skeletons. In the present study, we describe a new species of Acanthella from oceanographic expeditions of the northeast region of Brazil. Two specimens of Acanthella sp. nov. were collected by dredging at Ceará and Pernambuco State, Brazil. All specimens were preserved in 92% ethanol and deposited in the Porifera Collections at the Universidade Federal de Pernambuco (UFPEPOR). The taxonomic identification was carried out through analysis of spicules morphologies, using Light Microscopy (LM) and Scanning Electron Microscopy (SEM), following methods described by Hajdu et al. (2011). 

scholarly journals Reduction and Dissolution Behaviour of Manganese Slag in the Ferromanganese Process

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 97 ◽  
Author(s):  
Xiang Li ◽  
Kai Tang ◽  
Merete Tangstad
Keyword(s):  
Electron Microscopy ◽  
South Africa ◽  
Scanning Electron Microscopy ◽  
Liquidus Temperature ◽  
Reduction Rate ◽  
Manganese Ore ◽  
Thermo Gravimetric ◽  
Dissolution Behaviour ◽  
Manganese Slag ◽  
Scanning Electron

The reduction and liquidus behaviour of manganese slag with different basicities were studied in non-isothermal experiments in the temperature range of 1400–1500 °C. Certain amounts of quartz were added to Assmang ore (South Africa), and lime was added to Comilog ore (Gabon), to adjust the charge basicity to 0.5, 0.8 and 1.2. The extent of manganese ore reduction as a function temperature were determined by thermo-gravimetric (TG) balance. Morphology of ores and its change in the course of reduction was examined by scanning electron microscopy (SEM). The results show that the reduction rate of Assmang slag decreases with decreasing basicity, as the liquidus temperature of slag decreases. When spherical MnO phase is present, the activity of MnO is high, and the reduction rate is rapid. Comilog slags show a much higher reduction rate than Assmang slags. The activation energies of MnO reduction between 1400 to 1500 °C are estimated in this study and found to be 230 kJ/mol for Assmang charges and 470 kJ/mol for Comilog charges. The dissolution behaviours of Assmang and Comilog slags were also studied by FactSage simulation and verified by experiments.

External ultrastructure of Progonoia diatreta sp. nov. (Bacillariophyta, Scoliotropidaceae) differs from P. musca and P. intercedens comb. nov.

Phytotaxa ◽  
2015 ◽  
Vol 234 (3) ◽  
pp. 246 ◽  
Author(s):  
Christopher S. Lobban
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
20Th Century ◽  
Ultrastructural Study ◽  
Original Description ◽  
Undescribed Species ◽  
Calcareous Sand ◽  
Authentic Material ◽  
Valve Structure ◽  
Scanning Electron

Navicula musca was described by Gregory in 1857 as having moniliform areolae in unbroken striae; a detailed ultrastructural study by Schrader, who transferred the species to Progonoia in 1971, was consistent with the original description. However, going back at least to Peragallo & Peragallo at the turn of the 20th century, the same species has been described as having alveoli with fine puncta around the edge and a longitudinal break in the striae. I found examples of both forms in a collection of calcareous sand from Guam, examined them with light and scanning electron microscopy, and also examined authentic material of N. musca in the light microscope. I conclude that one of these taxa is consistent with N. intercedens, which must be removed from synonymy with P. musca, and that the form with the fine puncta is an undescribed species not previously observed ultrastructurally. This species, P. diatreta sp. nov., has an internal valve structure that clearly places it in Progonoia, but an external structure quite different from that of its congeners.

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.

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