Journal of Helminthology最新文献

{"title":"Morphological and molecular data on Pseudozoogonoides ugui Shimazu, 1974 (Digenea: Microphalloidea: Zoogonidae) ex Pseudaspius hakonensis (Günther, 1877) and taxonomic problems in Zoogoninae genera.","authors":"D. Atopkin, Y. I. Ivashko, A. V. Izrailskaia, Y. V. Tatonova, V. Besprozvannykh","doi":"10.1017/S0022149X24000233","DOIUrl":"https://doi.org/10.1017/S0022149X24000233","url":null,"abstract":"New morphological and molecular data were generated for trematodes recovered from the intestines of the fish Pseudaspius hakonensis from two locations in the south of the Russian Far East. Morphologically, these trematodes are identical to Pseudozoogonoides ugui (Microphalloidea: Zoogonidae) from Japan. According to results of phylogenetic analysis based on 28S rDNA sequence data, P. ugui was closely related to Zoogonoides viviparus, and P. subaequiporus appears as a sister taxon to these two species. Genetic distance values, calculated based on both 28S rDNA and ITS2 rDNA, between P. ugui and Z. viviparus represents an interspecific differentiation level. Our results have an ambiguous explanation, indicating that the implication of the presence of one or two compact vitellarial aggregations for the differentiation of Zoogonoides and Pseudozoogonoides should be reconsidered or that our results open up the question of the taxonomical status of trematodes previously denoted as Z. viviparus and P. subaequiporus.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140653768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two new Neotetraonchus species (Dactylogyridea, Dactylogyridae) parasitising the Peruvian sea catfish Galeichthys peruvianus (Siluriformes, Ariidae), including molecular data.","authors":"C. Cruces, J. Chero, L. Ñacari, V. R. De Celis, R. Simões, J. L. Luque","doi":"10.1017/S0022149X24000208","DOIUrl":"https://doi.org/10.1017/S0022149X24000208","url":null,"abstract":"As part of a parasitological survey, several specimens of two new monopisthocotylean species, Neotetraonchus celsomanueli sp. nov. and N.peruvianus sp. nov. (Dactylogyridea, Dactylogyridae), were collected from the gill filaments of the Peruvian sea catfish Galeichthys peruvianus (Siluriformes, Ariidae) off Puerto Pizarro, Tumbes region, Peru. Neotetraonchus celsomanueli sp. nov. is characterised by an MCO with a T-shaped distal end and an accessory piece that is ribbed and expanded proximally with a worm-shaped termination. Neotetraonchus peruvianus sp. nov. is typified by its MCO, which has a sledgehammer-shaped distal end and an accessory piece with a claw-shaped distal end. Additionally, N.peruvianus sp. nov. is characterised by its jellyfish-shaped onchium. A partial 28S rDNA sequence was obtained from N.celsomanueli sp. nov., and a phylogenetic analysis was conducted. This analysis revealed the phylogenetic position of Neotetraonchus celsomanueli sp. nov. within a clade comprising monopisthocotylean parasites of diadromous and marine ariid catfishes, including Hamatopeduncularia spp., Chauhanellus spp., Thysanotohaptor Kritsky, Shameem, Kumari & Krishnaveni, , and Neocalceostomoides spinivaginalis Lim, 1995. This finding brings the number of known Neotetraonchus species to seven and represents the first described Neotetraonchus species infecting marine catfishes from Peru.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140666511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasound diagnosis of cystic echinococcosis: updates and implications for clinical management","authors":"F. Tamarozzi","doi":"10.1017/s0022149x2400021x","DOIUrl":"https://doi.org/10.1017/s0022149x2400021x","url":null,"abstract":"The diagnosis of cystic echinococcosis (CE) is based on imaging. Detection of a focal lesion with morphological characteristics of <jats:italic>Echinococcus granulosus</jats:italic> sensu lato metacestode is the starting point for the diagnostic workup. In organs explorable with ultrasound (US), this is the method of choice for both aetiological diagnosis of CE and staging of the CE cyst. Staging in terms of lesion morphology is also needed when serology is added to the diagnostic workflow when imaging alone is inconclusive. Finally, staging guides the clinical management of uncomplicated CE, especially in the liver. This commentary provides an overview of the most up-to-date evidence backing the above-mentioned role of US in the diagnosis and clinical management of CE. Finally, we outline future perspectives for the improvement of CE diagnosis.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140610688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two new species of the genus Sectonema Thorne, 1930 (Nematoda, Dorylaimida, Aporcelaimidae) from Iran, with new insights into its evolutionary relationships","authors":"M. Keramat, Z. Mahboubi, M. R. Atighi, E. Pourjam, P. Castillo, M. Pedram, R. Peña-Santiago","doi":"10.1017/s0022149x24000245","DOIUrl":"https://doi.org/10.1017/s0022149x24000245","url":null,"abstract":"Two new species of the genus <jats:italic>Sectonema</jats:italic> found in northern Iran are characterized, including morphological descriptions and molecular (18S-, 28S-rDNA) analyses. <jats:italic>Sectonema tehranense</jats:italic> sp. nov. is distinguished by its 7.22 – 8.53 mm long body, lip region offset by constriction and 24 – 31 μm wide with perioral lobes and abundant setae- or cilia-like projections covering the oral field, mural tooth 15.5 – 17 μm long at its ventral side, neck 1091 – 1478 μm long, pharyngeal expansion occupying 61 – 71% of the total neck length, female genital system diovarian, uterus simple and 3.9 – 4.2 times the corresponding body diameter long, transverse vulva (<jats:italic>V</jats:italic> = 49 – 59), tail short and rounded (44 – 65 μm, <jats:italic>c</jats:italic> = 99 – 162, <jats:italic>c’</jats:italic> = 0.6 – 0.8), spicules 111 – 127 μm long, and 7 – 10 spaced ventromedian supplements with hiatus. <jats:italic>Sectonema noshahrense</jats:italic> sp. nov. displays a 4.07 – 4.73 mm long body, lip region offset by constriction and 23 – 25 μm wide with perioral lobes and abundant setae- or cilia-like projections covering the oral field, odontostyle 14 – 14.5 μm long, neck 722 – 822 μm long, pharyngeal expansion occupying 66 – 68% of the total neck length, female genital system diovarian, uterus simple and 2.4 – 2.7 times the corresponding body diameter long, transverse vulva (<jats:italic>V</jats:italic> = 54 – 55), tail convex conoid (39 – 47 μm, <jats:italic>c</jats:italic> = 91 – 111, <jats:italic>c’</jats:italic> = 0.8 – 0.9), spicules 82 μm long, and seven spaced ventromedian supplements with hiatus. Molecular analyses confirm a maximally supported (<jats:italic>Epacrolaimus</jats:italic> + <jats:italic>Metaporcelaimus</jats:italic> + <jats:italic>Sectonema</jats:italic>) clade and a tentative biogeographical pattern, with sequences of Indolamayan taxa forming a clade separated from those of Palearctic ones. Parallel or convergent evolution processes might be involved in the phylogeny of the species currently classified under <jats:italic>Sectonema.</jats:italic> This genus is certainly more heterogeneous than previously assumed.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterisation of the mitochondrial genome and phylogenetic analysis of Toxocara apodemi (Nematoda: Ascarididae)","authors":"Y. Gao, Y. Hu, S. Xu, H. Liang, H. Lin, T. H. Yin, K. Zhao","doi":"10.1017/s0022149x24000221","DOIUrl":"https://doi.org/10.1017/s0022149x24000221","url":null,"abstract":"We first sequenced and characterised the complete mitochondrial genome of <jats:italic>Toxocara apodeme,</jats:italic> then studied the evolutionary relationship of the species within Toxocaridae. The complete mitochondrial genome was amplified using PCR with 14 specific primers. The mitogenome length was 14303 bp in size, including 12 PCGs (encoding 3,423 amino acids), 22 tRNAs, 2 rRNAs, and 2 NCRs, with 68.38% A+T contents. The mt genomes of <jats:italic>T. apodemi</jats:italic> had relatively compact structures with 11 intergenic spacers and 5 overlaps. Comparative analyses of the nucleotide sequences of complete mt genomes showed that <jats:italic>T. apodemi</jats:italic> had higher identities with <jats:italic>T. canis</jats:italic> than other congeners. A sliding window analysis of 12 PCGs among 5 <jats:italic>Toxocara</jats:italic> species indicated that <jats:italic>nad</jats:italic>4 had the highest sequence divergence, and <jats:italic>cox</jats:italic>1 was the least variable gene. Relative synonymous codon usage showed that UUG, ACU, CCU, CGU, and UCU most frequently occurred in the complete genomes of <jats:italic>T. apodemi.</jats:italic> The Ka/Ks ratio showed that all <jats:italic>Toxocara</jats:italic> mt genes were subject to purification selection. The largest genetic distance between <jats:italic>T. apodemi</jats:italic> and the other 4 congeneric species was found in <jats:italic>nad</jats:italic>2, and the smallest was found in <jats:italic>cox</jats:italic>2. Phylogenetic analyses based on the concatenated amino acid sequences of 12 PCGs demonstrated that <jats:italic>T. apodemi</jats:italic> formed a distinct branch and was always a sister taxon to other congeneric species. The present study determined the complete mt genome sequences of <jats:italic>T. apodemi</jats:italic>, which provide novel genetic markers for further studies of the taxonomy, population genetics, and systematics of the Toxocaridae nematodes.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparison of the prevalence of Spirocerca lupi in three groups of dogs with different life and hunting styles","authors":"M.E. Mylonakis, A.F. Koutinas, M.V. Liapi, M.N. Saridomichelakis, T.S. Rallis","doi":"10.1017/s0022149x00701556","DOIUrl":"https://doi.org/10.1017/s0022149x00701556","url":null,"abstract":"The prevalence of <jats:italic>Spirocerca lupi</jats:italic> in 260 privately owned dogs with different life and hunting styles in Greece was based on the examination of randomly taken faecal samples using Teleman's sedimentation technique. The dogs did not demonstrate any clinical signs of spirocerciasis. Although the prevalence was 10%, it was found to be significantly higher in trace hunting dogs (21%), than in scent hunting dogs (5%) and household pets (0%). There was no relationship between prevalence and age/sex of dogs. The impact of life and hunting styles on the prevalence of <jats:italic>S. lupi</jats:italic> in the dog and that of the faecal examination technique, are discussed.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the antigenicity of protoscoleces and microvesicles of Echinococcus multilocularis prepared from rats","authors":"A. Ito, T. Kanazawa, M. Nakao, Y. Sako, Y. Ishikawa, K. Nakaya","doi":"10.1017/s0022149x00701544","DOIUrl":"https://doi.org/10.1017/s0022149x00701544","url":null,"abstract":"Rats are known to be relatively resistant to infection with <jats:italic>Echinococcus multilocularis</jats:italic>. However, when rats are inoculated with the parasite tissues, <jats:italic>E. multilocularis</jats:italic> proliferates slowly at first but after 6 months the cysts increase in size considerably and contain large numbers of protoscoleces. As rats survive for 18 months or longer, approximately 100 ml of packed protoscoleces can be produced from each rat. A comparison of the antigenicity of the protoscoleces and microvesicles by immunoblot methods showed that both Em18 and Em16 are shared components between both protoscoleces and microvesicles, although the latter have some additional antigenic components. In antigens prepared from protoscoleces, the banding patterns around Em18 were much simpler than those from microvesicles. Therefore, for serodiagnosis of <jats:italic>E. multilocularis</jats:italic>, antigens should be carefully prepared from protoscoleces rather than microvesicles from the rat.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A field study of natural infections in three freshwater snails with Fasciola hepatica and/or Paramphistomum daubneyi in central France","authors":"M. Abrous, D. Rondelaud, G. Dreyfuss","doi":"10.1017/s0022149x00700897","DOIUrl":"https://doi.org/10.1017/s0022149x00700897","url":null,"abstract":"Natural infections of three freshwater snails with <jats:italic>Fasciola hepatica</jats:italic> and/or <jats:italic>Paramphistomum daubneyi</jats:italic> were studied during two periods in 1996 and 1997 (June–July and September–October) on 18 farms located in the departments of Vienne and Haute Vienne (central France), and known for low prevalences of <jats:italic>F. hepatica</jats:italic> infections in ruminants. A total of 1573 <jats:italic>Lymnaea glabra</jats:italic> and 1421 <jats:italic>L. truncatula</jats:italic> 6 mm high or more were collected in the meadows of 13 farms and dissected under laboratory conditions. Snails with single or concurrent infections of <jats:italic>F. hepatica</jats:italic> and/or <jats:italic>P. daubneyi</jats:italic> were found for each <jats:italic>Lymnaea</jats:italic> species. In<jats:italic>L. truncatula</jats:italic>, global prevalences of natural infections with <jats:italic>F. hepatica</jats:italic> (3.8% in June–July, and 3.6% in September–October) were significantly greater than those recorded for <jats:italic>P. daubneyi</jats:italic> (1.1% and 0.8%, respectively). In <jats:italic>L. glabra</jats:italic>, global prevalences of <jats:italic>F. hepatica</jats:italic> infections (0.4% in each investigation period) were significantly lower than those found in <jats:italic>L. truncatula</jats:italic>, whereas there were no significant differences between prevalences of <jats:italic>P. daubneyi</jats:italic> infections. A total of 2721 <jats:italic>Planorbis leucostoma</jats:italic> measuring at least 4 mm in diameter were collected in the meadows of the other five farms on which <jats:italic>L. truncatula</jats:italic> was absent. In these planorbids, global prevalences of natural infections with <jats:italic>F. hepatica</jats:italic> were 0.4% in each period of investigation. Contrary to fasciolosis, snail infections with <jats:italic>P. daubneyi</jats:italic> were not noted on all farms of the Vienne and Haute-Vienne departments. Natural single or concurrent infections with <jats:italic>F. hepatica</jats:italic> and/or <jats:italic>P. daubneyi</jats:italic> in <jats:italic>L. glabra</jats:italic> and a natural infection of <jats:italic>P. leucostoma</jats:italic> with <jats:italic>F. hepatica</jats:italic> were found in swampy meadows on acid soil.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140587359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temporal variations in the infection of a population of Cerithidea cingulata by larval trematodes in Kuwait Bay","authors":"W.Y. Al-Kandari, J. Abdul-Salam, R. Meakins","doi":"10.1017/s0022149x00700034","DOIUrl":"https://doi.org/10.1017/s0022149x00700034","url":null,"abstract":"The prosobranch gastropod <jats:italic>Cerithidea cingulata</jats:italic> (Gastropoda: Potamididae) in Kuwait Bay was examined for larval trematode infections over a 17-month period. A total of 2537 snails were examined and 1265 (49.9%) found to be infected with one or more species of trematodes. The component community in the snail comprised 12 species representing the families Cyathocotylidae (2), Echinostomatidae (2), Haplosplanchnidae (1), Heterophyidae (2), Microphallidae (1), Philophthalmidae (2), Plagiorchiidae (1) and Schistosomatidae (1). Cyathocotylid II (41.6%) was by far the most prevalent species followed by the microphallid (3.9%), the two species comprised 90% of the total trematode fauna. The prevalence of infection increased with shell size and was significantly higher in male (47%) than female (33%) snails. Multiple infections were observed in only 15 (1.2%) of the infected snails; cyathocotylid I and cyathocotylid II combination occurred 14 times and heterophyid I and the microphallid occurred once. Trematode species were more diverse and prevalent in winter, and cercarial shedding peaked in summer. Behaviour of the definitive host and snail population dynamics were probably the major contributors to the detected temporal pattern in the infections.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140579257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acquired resistance in rainbow trout against Gyrodactylus derjavini","authors":"T. Lindenstrøm, K. Buchmann","doi":"10.1017/s0022149x00700836","DOIUrl":"https://doi.org/10.1017/s0022149x00700836","url":null,"abstract":"Investigations were conducted on the host response in rainbow trout and the associated changes in mucous cell density during infection with the skin monogenean <jats:italic>Gyrodactylus derjavini</jats:italic>. Parasite populations increased on all naive hosts and peaked 4–5 weeks p.i. after which infection levels decreased. Introduction of naive fish into responding host populations resulted in heavy infections of the naive fish, whereas parasite expulsion continued in the responding host groups showing an acquired, non-sterile immunity. This non-sterile immunity lasted at least a month as these hosts were refractory to reinfection despite being exposed to a high infection pressure. Mucous cell hyperplasia was seen in some groups during the intermediary phase of infection, but at the termination of the study a significant depletion was evident. Passive immunization of naive host (with sera from immune hosts) did not confer protection. This indicates differences between host responses to <jats:italic>G. derjavini</jats:italic> compared to responses against other pathogens where such a passive immunity has been described.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140578904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}