Can Cryptogonimids of the Same Genus Influence Each Other's Level of Genetic Variation?

Trematodes of the genus are parasites that are common in East and Southeast Asia. These parasites are known to infect fish, thus impacting aquaculture significantly. An introspection into the dynamics of infection of these parasites has revealed possible co-infection in shared hosts.

Body Surface Ultrastructure as a Main Morphological Criterion for Distinguishing Adult Trematode .

In the present study, the ultrastructure of the body surface of mature trematodes of Shumenko et al., 2017 has been studied for the first time. It has been found that the tegumental spines on the surface of their bodies are very different from those in three other species of large trematodes of the genus : Katsurada, 1912; Suzuki in Takahashi, 1929; and Saito et al.

Morphological and molecular data on Shimazu, 1974 (Digenea: Microphalloidea: Zoogonidae) ex (Günther, 1877) and taxonomic problems in Zoogoninae genera.

New morphological and molecular data were generated for trematodes recovered from the intestines of the fish from two locations in the south of the Russian Far East. Morphologically, these trematodes are identical to (Microphalloidea: Zoogonidae) from Japan. According to results of phylogenetic analysis based on 28S rDNA sequence data, was closely related to , and appears as a sister taxon to these two species.

Morpho-Molecular Features and Phylogenetic Relationships of Oschmarin, 1963 (Trematoda: Opisthorchiidae) from East Asia.

Adult trematodes of the genus were found in the gallbladders of ducklings that had been experimentally fed freshwater fishes of the genera and that were naturally infected by metacercariae. Some of the trematodes were identified as , whose morphology of developmental stages and molecular data had previously been described in detail. The other trematodes were confirmed as species on the basis of morphological features: subterminal oral sucker, vitelline follicles with interrupted bands, and rosette-shaped testes.

A Description of n. sp. (Echinochasmidae) Based on Morphological and Molecular Data.

Adult individuals of n. sp. were obtained during an experimental study on trematodes' life cycle.

Assessing the population structure of trematode Metagonimus suifunensis using three mitochondrial markers.

In this work, for the first time, the genetic variability of the Metagonimus suifunensis population in the Russian southern Far East was estimated based on the full-length sequences of the nad1 gene of mitochondrial DNA. In addition, for a sample of the same size, the sequences of cox1 and cytb genes, previously used for population studies for M. suifunensis, were reanalysed.

New species of Psilotrema and Sphaeridiotrema (Psilostomidae Odhner, 1913) in the east Asian region: Morphology of developmental stages and genetic data.

Morphological and genetic data have been obtained for five new East Asian species of the Psilostomatidae. The life cycle of Psilotrema limosum n. sp.

Three species of Kobayashi, 1921 (Digenea: Cryptogonimidae) in the East-Asian region: morphological and molecular data.

New data have been obtained for three representatives of Exorchis; Exorchis convictus sp. n., Exorchis oviformis and Exorchis sp.

nom. nov., other spp. and in East Asia: morphology, molecular data and phylogeny within Echinostomatidae.

Life cycles, and morphological and molecular data were obtained for Echinostoma chankensis nom. nov., Echinostoma cinetorchis, Echinostoma miyagawai and Isthmiophora hortensis from East Asia.

Are Melanoides tuberculata and Tarebia granifera (Gastropoda, Thiaridae), suitable first intermediate hosts of Clonorchis sinensis in Vietnam?

Background: Two thiarid snail species, Melanoides tuberculata and Tarebia granifera have been reported as first intermediate hosts of the liver fluke Clonorchis sinensis; however, their role as true first intermediate hosts has not been verified. Thus, the present study aimed to clarify the suitability of these two snail species as first intermediate hosts of C. sinensis.

Five monogenean species (Allodiscocotylidae, Heteromicrocotylidae, Microcotylidae) from the Pacific seabream Acanthopagrus pacificus (Perciformes: Sparidae) in the Gulf of Tonkin off Vietnam, with descriptions of three new species.

A total of 52 specimens of the Pacific seabream Acanthopagrus pacificus Iwatsuki, Kume et Yoshino from the Gulf of Tonkin off Vietnam were examined for monogeneans. Twenty fish were parasitised by 101 individuals of five monogenean species, including two known species Allodiscocotyla diacanthi Unnithan, 1962 and Heterapta chorinemi (Tripathi, 1956), as well as three new species, Polylabroides tienyenensis sp. n.

Paragonimus heterotremus Chen et Hsia, 1964 (Digenea: Paragonimidae): species identification based on the biological and genetic criteria, and pathology of infection.

As a result of the experimental infection of rats with metacercariae of Paragonimus heterotremus Chen et Hsia, 1964 from crabs (Potamiscus tannanti) caught in Yen Bai province, Vietnam, it was found that worms migrated into the lungs, to the liver and less frequently to the tissue that lines body cavities of the hosts, where they reached the adult stage, but in the muscles, worms stayed at the larval stage. Studies have shown that for P. heterotremus, rats can simultaneously play the role of the final and paratenic host; herewith, an infection with the trematode of this species can lead to the development of three forms of paragonimiasis: pulmonary, hepatic and muscular.

sp. nov., Yamaguti, 1939 and Besprozvannykh, 1991 from the Russian southern Far East and their phylogenetic relationships within the Echinochasmidae Odhner 1910.

Mature worms of Stephanoprora amurensis sp. nov. were obtained in an experimental study of its life cycle.

Morphological and molecular data for highly pathogenic avian parasite Erschoviorchis anuiensis sp. n. and phylogenetic relationships within the Opisthorchiidae (Trematoda).

Adult worms of Erschoviorchis anuiensis sp. n., parasites of the pancreas and liver of birds, were found by feeding the Muscovy ducks Cairina moschata dom.

First description of genetic diversity for the genus Metagonimus using the complete cox1 gene sequence.

The complete cox1 gene sequence was analysed for Metagonimus suifunensis from eight localities in the Russian southern Far East, and the level of variability was compared with that of Clonorchis sinensis from the same territory of Russia. These species belong to the superfamily Opisthorchioidea, have a similar distribution in the Russian southern Far East and share second intermediate and definitive hosts, but are distinguished by their first intermediate hosts belonging to different orders of caenogastropods. The data obtained showed that the nucleotide sequence variability of the M.

Description of a new species, Cryptocotyle lata sp. nov., and discussion of the phylogenetic relationships in Opisthorchioidea.

Adult Cryptocotyle lata sp. nov. worms were obtained from experimental studies.

Developmental stages of Notocotylus magniovatus Yamaguti, 1934, Catatropis vietnamensis n. sp., Pseudocatatropis dvoryadkini n. sp., and phylogenetic relationships of Notocotylidae Lühe, 1909.

Data on the life cycles and morphology of the developmental stages of Notocotylus magniovatus, Catatropis vietnamensis n. sp., and Pseudocatatropis dvoryadkini n.

Infections by Hepatic Trematodes in Cats from Slaughterhouses in Vietnam.

Domestic cats are a final host for some hepatic trematodes, and cat meat is used for human consumption in several parts of northern Vietnam. Since there is no tradition for commercial cat rearing in the area, cats are purchased alive from other areas as well, i.e.

Description of Metagonimus pusillus sp. nov. (Trematoda: Heterophyidae): phylogenetic relationships within the genus.

As a result of experimental studies conducted in the Russian southern Far East, adult worms from the genus Metagonimus were obtained. A comparative analysis of the morphometry of these worms with other Metagonimus representatives showed that they are most similar to M. katsuradai Izumi, 1935 and M.

The geographical vector in distribution of genetic diversity for Clonorchis sinensis.

Clonorchis sinensis, the causative agent of clonorchiasis, is one of the most important parasites that inhabit countries of East and Southeast Asia. In this study, we validated the existence of a geographical vector for C. sinensis using the partial cox1 mtDNA gene, which includes a conserved region.

Inter-individual and intragenomic variations in the ITS region of Clonorchis sinensis (Trematoda: Opisthorchiidae) from Russia and Vietnam.

Here we examined the intraspecific genetic variability of Clonorchis sinensis from Russia and Vietnam using nuclear DNA sequences (the 5.8S gene and two internal transcribed spacers of the ribosomal cluster). Despite the low level of variability in the ITS1 region, this marker has revealed some features of C.

Metagonimus suifunensis sp. n. (Trematoda: Heterophyidae) from the Russian Southern Far East: Morphology, life cycle, and molecular data.

The trematode from the Russian Southern Far East, earlier defined as M. yokogawai Katsuradai, 1912, was determined as a representative of the new species Metagonimus suifunensis sp. n.

Genetic diversity of the Chinese liver fluke Clonorchis sinensis from Russia and Vietnam.

Clonorchiasis is a parasitic disease of high public health importance in many countries in southeastern Asia and is caused by the Chinese liver fluke Clonorchis sinensis. However, the genetic structure and demographic history of its populations has not been sufficiently studied throughout the geographic range of the species and available data are based mainly on partial gene sequencing. In this study, we explored the genetic diversity of the complete 1560 bp cytochrome c oxidase subunit 1 (cox1) gene sequence for geographically isolated C.

Genetic diversity of Clonorchis sinensis (Trematoda: Opisthorchiidae) in the Russian southern Far East based on mtDNA cox1 sequence variation.

We examined the phylogeography and the variation of the mitochondrial DNA (mtDNA) cytochrome c oxidase subunit 1 gene (cox1) of the Chinese liver fluke Clonorchis sinensis (Cobbold, 1875) in two geographic localities in the Russian southern Far East and compared them with those from different geographical regions (China, Korea, Japan and Vietnam). The Russian samples differed from those of the other regions in haplotype frequencies, haplotype and nucleotide diversities, and AT/GC ratios. Only 4 of the 18 haplotypes were common to Russian and Chinese samples, and two haplotypes were common to Russia and other regions.