Chrysophycean stomatocysts from Xinjiang Province, China

Phytotaxa ◽  
2016 ◽  
Vol 288 (1) ◽  
pp. 41 ◽  
Author(s):  
WANTING PANG ◽  
QUANXI WANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Asia ◽  
Working Group ◽  
First Report ◽  
Low Diversity ◽  
Scanning Electron

Chrysophycean stomatocysts from 167 samples taken at 35 localities in Xinjiang Province, China were observed by scanning electron microscopy. The stomatocysts assemblages are characterized by low diversity and low abundance. Only 19 morphotypes were identified, of which nine are new to science. New stomatocysts were described following International Statospore Working Group (ISWG) guidelines. This is the first report of chrysophycean stomatocysts from Central Asia.

New perspectives on Nephridiacanthus major (Acanthocephala: Oligacanthorhynchidae) collected from hedgehogs in Iran

2020 ◽  
Vol 94 ◽  
Author(s):  
O.M. Amin ◽  
M. Sharifdini ◽  
R.A. Heckmann ◽  
M. Zarean
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phylogenetic Analysis ◽  
Chemical Analysis ◽  
Central Asia ◽  
Molecular Profile ◽  
X Ray ◽  
The Family ◽  
First Time ◽  
Scanning Electron

We describe morphological features not previously reported for this old acanthocephalan Nephridiacanthus major (Bremser, 1811 in Westrumb, 1821) Golvan, 1962 first described over 200 years ago. Our specimens were collected from long-eared hedgehog Hemiechinus auritus (Gmelin, 1770) (Erinaceidae) in Iran. We compare the morphometrics of our material with others previously reported from the same host in Iran, Russia, central Asia and Europe. Our specimens had markedly smaller proboscides, proboscis hooks and lemnisci than those reported from Russia and central Asia, but comparable measurements of other structures with specimens previously described from other collections. We document our new observations with scanning electron microscopy features not previously demonstrable by other observers and provide a chemical analysis of proboscis hooks using energy-dispersive X-ray analysis for the first time. The molecular profile of this acanthocephalan, based on 18S rDNA and cox1 genes, was generated for the first time. The phylogenetic analysis showed that N. major is placed in a clade of the family Oligacanthorhynchidae, well separated from the families Moniliformidae and Gigantorhynchidae.

Fine morphology of the cuticle surface of Chordodes anthophorus and reinterpretation of C. aquaeductus, C. ferganensis and C. oscillatus (Gordiida Nematomorpha)

Zootaxa ◽  
2007 ◽  
Vol 1397 (1) ◽  
pp. 39-45 ◽  
Author(s):  
CRISTINA DE VILLALOBOS ◽  
FERNANDA ZANCA ◽  
SERGEI SPIRIDONOV
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Asia ◽  
The Other ◽  
Species Status ◽  
Taxonomic Descriptions ◽  
Former Ussr ◽  
Fine Morphology ◽  
Scanning Electron

We reinvestigate four species of the genus Chordodes from Central Asia and one from Georgia (Transcaucasian part of former USSR) in order to certify the taxonomic descriptions and verify the species status. By scanning electron microscopy, we demonstrate characteristic cuticular patterns for Chordodes anthophorus. The other three species, C. aquaeductus, C. ferganensis and C. oscillatus are synonymized with C. anthophorus because no differences were detected.

Chrysophycean stomatocysts from freshwater habitats of the Strømness Bay area, South Georgia, Antarctica

2000 ◽  
Vol 78 (1) ◽  
pp. 88-97 ◽  
Author(s):  
Bart Van de Vijver ◽  
Louis Beyens
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Working Group ◽  
South Georgia ◽  
Chrysophyte Cysts ◽  
Bay Area ◽  
Freshwater Habitats ◽  
Chrysophyte Stomatocysts ◽  
Scanning Electron

The chrysophycean stomatocyst flora of freshwater samples from the Strømness Bay area, located in the northern part of the Sub-Antarctic Island of South Georgia, was investigated, using scanning electron microscopy. A total of 59 stomatocyst morphotypes were recorded. Thirty-one of them were previously observed and 28 are described as new, following guidelines of the International Statospore Working Group. Since this is only the second study of chrysophyte cysts from South Georgia, this large number of new morphotypes is not surprising. The cyst flora show only a small resemblance to the stomatocyst flora found on mosses of the same area.Key words: chrysophyte stomatocysts, South Georgia, Sub-Antarctica.

Stipa ×fallax (Poaceae: Pooideae: Stipeae), a new natural hybrid from Tajikistan, and a new combination in Stipa drobovii

Phytotaxa ◽  
2017 ◽  
Vol 303 (2) ◽  
pp. 141 ◽  
Author(s):  
MARCIN NOBIS ◽  
ARKADIUSZ NOWAK ◽  
AGNIESZKA NOBIS ◽  
SYLWIA NOWAK ◽  
JUSTYNA ŻABICKA ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Asia ◽  
Field Observation ◽  
Parental Species ◽  
Pollen Grain ◽  
Numerical Analyses ◽  
New Combination ◽  
Natural Hybrid ◽  
Scanning Electron

Stipa ×fallax nothosp. nov. (Poaceae), from western Pamir Alai Mts (Tajikistan), is described and illustrated. Field observation, numerical analyses of morphology, and pollen grain viability data show that it originated from hybridization between S. drobovii and S. macroglossa subsp. macroglossa, species representing sections Smirnovia and Stipa, respectively. Stipa ×fallax is morphologically close to S. ×alaica and S. ×hissarica, but is distinguished by its shortly pilose lower part of the awn and densely pubescent leaves. Characters distinguishing S. ×fallax from its parental species as well as similar hybrid taxa in section Smirnovia that also grow in Central Asia are presented. The micromorphology of lemmas and leaves of S. ×fallax and its parental species was examined by scanning electron microscopy. We also propose the new combination Stipa drobovii var. iskanderkulica (Tzvelev) M.Nobis & A.Nowak.

First report of Schulzia travassosi (Nematoda, Trichostrongylina, Molineoidea) for amphibians of the Chaco region in Argentina and proposal of Oswaldocruzia melanostictusi nov. comb.

2015 ◽  
Vol 60 (4) ◽  
Author(s):  
Cynthya E. González ◽  
Monika I. Hamann
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
First Record ◽  
Nematode Parasite ◽  
First Report ◽  
Chaco Region ◽  
Males And Females ◽  
Almost All ◽  
Chaco Province ◽  
Scanning Electron

AbstractThis is the first record of the nematode parasite Schulzia travassosi (Trichostrongylina, Molineidae) in two Argentinean amphibians, Leptodactylus bufonius and Rhinella major, collected in two localities of the Chaco region, Las Lomitas (Formosa Province) and Taco Pozo (Chaco Province). The species was observed using light and scanning electron microscopy (SEM) and compared with previous studies of Paraguayan specimens. Regarding metric characters, the measurements found in Argentinean specimens generally did not differ from those of Paraguayan specimens; some differences were observed in the total length of males and females (some longer and some shorter than Paraguayan specimens), length of the oesophagus (in almost all specimens shorter than in Paraguayan ones) and position of the vulva (nearer to posterior end in Argentinean specimens). The branches and sphincter of ovejector are slightly longer than in Paraguayan female specimens. In males, ray 4 is almost the same length as rays 2, 3 and 5, 6. Cephalic end, cephalic vesicle, synlophe and vulvar depression were viewed under SEM. Schulzia melanostictusi Chopra, Shing and Kumar, 1986 is reassigned as Oswaldocruzia melanostictusi (Chopra, Shing and Kumar, 1986) nov. comb.

The diatom genus Gomphonema Ehrenberg in Lake Baikal. II. Revision of taxa from Gomphonema acuminatum and Gomphonema truncatum-capitatum complexes

Phytotaxa ◽  
2015 ◽  
Vol 233 (3) ◽  
pp. 251 ◽  
Author(s):  
Maxim Sergeevich Kulikovskiy ◽  
John Patrick Kociolek ◽  
Cuneyt Nadir Solak ◽  
Irina Kuznetsova
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Asia ◽  
Lake Baikal ◽  
Wide Distribution ◽  
Species Complexes ◽  
Diatom Genus ◽  
Scanning Electron

We document the diversity of diatom taxa from the G. acuminatum and truncatum-capitatum species complexes in Lake Baikal using light and scanning electron microscopy. This investigation revealed four species new to Science, namely G. pseudacuminatum sp. nov., G. microlaticollum sp. nov., G. paracapitatum sp. nov., and G. microcapitatum sp. nov. In addition, we consider seven previously described species that are part of these ‘typical Gomphonema’ complexes. Some of the taxa treated here were previously observed from other regions, especially from Mongolia. These data show a wide distribution of species from these complexes in waterbodies of Central Asia, and confirm the presence of some cosmopolitan taxa within Lake Baikal.

A study of Enterogyrus sp. (Monogenea) parasitizing the foregut of captive Pomacanthus paru (Pomacanthidae) in Georgia

1987 ◽  
Vol 65 (2) ◽  
pp. 312-316 ◽  
Author(s):  
D. K. Cone ◽  
J. B. Gratzek ◽  
G. L. Hoffman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Digestive Enzymes ◽  
Host Tissue ◽  
The Body ◽  
Body Axis ◽  
Main Body ◽  
First Report ◽  
Scanning Electron

A species of Enterogyrus Paperna, 1963 (Monogenea: Ancyrocephalidae) parasitizing the foregut of a captive Pomacanthus paru (Pomacanthidae) in Georgia was studied in situ both histologically and with scanning electron microscopy. The worms are found at the junction of the esophagus and stomach and arrange themselves with their main body axis directed perpendicular to longitudinal folds in the foregut wall. They cling to host tissue principally by blades of the pair of large dorsal hamuli and apparently rely little on the action of the pair of small ventral hamuli and the 14 marginal hooks. It is argued that this adhesive attitude allows unrestricted movement when peristaltic waves move along the gut and the worm thereby maintains a stable footing. The body tegument is unusually thick (2 to 5 μm) for the worm's size. Dorsally it is smooth and devoid of microvilli. Ventrally it is thrown into transverse folds having small microvilli and unique round to oval papillae that measure up to 7 μm in diameter. Evidently the modified tegument is an adaptation to life in the foregut, possibly serving to protect worms from digestive enzymes. The study represents the first report of Enterogyrus from a marine host.

scholarly journals Dermatosparaxis in two White Doper lambs in Brazil: case report

2015 ◽  
Vol 67 (3) ◽  
pp. 741-746 ◽  
Author(s):  
A.P.C. Silva ◽  
J.P.S. Mol ◽  
C.A. Carvalho Junior ◽  
T.A. Paixão ◽  
R.L. Santos
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Case Report ◽  
Genetic Disease ◽  
Collagen Fibers ◽  
Collagen Fibrils ◽  
Transmission Microscopy ◽  
First Report ◽  
Skin Fragility ◽  
Scanning Electron

Dermatosparaxis is a genetic disease that affects collagen maturation. This disease is characterized by marked impairment of the resistance of collagen fibers that leads to skin fragility, and it may affect several species. This is the first report of dermatosparaxis in sheep in Brazil. Clinically, two White Dorper lambs had multiple skin lacerations in the neck, dorsum and limbs. Transmission microscopy demonstrated irregular collagen fibers arranged in hieroglyphic shape and scanning electron microscopy demonstrated thin collagen fibrils that were not arranged in bundles as observed in the normal dermis. These findings are consistent with the diagnosis of dermatosparaxis.

Sign in / Sign up

Export Citation Format

Share Document