Journal of Helminthology最新文献_第9页

'First record of Hsiungia pekingensis (Nematoda: Strongylidae) in North America: Morphological and molecular identification of a rare equine strongyle. 北京熊家马（线虫纲：圆线虫科）在北美的首次记录：一种罕见马圆线虫的形态和分子鉴定。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-24 DOI: 10.1017/S0022149X25000185

S Mohtasebi, S Ahn, B Rosa, K Moyes, T A Kuzmina, J S Gilleard, J Poissant

{"title":"'First record of Hsiungia pekingensis (Nematoda: Strongylidae) in North America: Morphological and molecular identification of a rare equine strongyle.","authors":"S Mohtasebi, S Ahn, B Rosa, K Moyes, T A Kuzmina, J S Gilleard, J Poissant","doi":"10.1017/S0022149X25000185","DOIUrl":"10.1017/S0022149X25000185","url":null,"abstract":"Equids are infected by a diversity of gastrointestinal nematode parasites, including 64 species of equine strongyle nematodes from19 genera. Despite numerous surveys of horse strongyles worldwide, certain geographic regions and rare species remain understudied. In 1964, a new species of equine strongyle, Cylicocyclus pekingensis, was described from a donkey in China. Subsequently, this species was recorded in horses from Kazakhstan and reclassified as Hsiungia pekingensis (K'ung and Yang, 1964), the only species in this genus. Since then, H. pekingensis has not been reported elsewhere, with limited knowledge on its distribution and phylogeny.This study documents the first record of H. pekingensis in North America. Adult specimens were recovered from fecal samples of a domestic horse in Alberta, Canada, following treatment with ivermectin. Species identification involved detailed morphological examination, complemented with sequencing of the internal transcribed spacer 1 (ITS1), 5.8S rRNA gene, and the internal transcribed spacer 2 (ITS2) regions of the nuclear genome. Phylogenetic analysis indicated a close evolutionary relationship with species from Poteriostomum and Parapoteriostomum genera. Nemabiome ITS2 sequencing of a paired pre-treatment sample also detected the presence of H. pekingensis in the studied horse. Re-analysis of public equine nemabiome datasets further detected H. pekingensis in feral horses in Alberta, but not in other regions considered. This study expands the known distribution of this rare species and enhances our knowledge of its placement in the phylogeny of equine strongyles. Furthermore, our re-analysis of public nemabiome datasets highlights the value of this approach for studying the global distribution of parasite species.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e35"},"PeriodicalIF":1.3,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143483392","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}

引用次数: 0

Freshwater trematodes in Iceland and the surrounding north - current advances and questions. 冰岛及周边北部淡水吸虫的进展与问题。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-24 DOI: 10.1017/S0022149X25000215

A Faltýnková, O Kudlai, D Jouet, K O'Dwyer, C Pantoja, K Skírnisson

{"title":"Freshwater trematodes in Iceland and the surrounding north - current advances and questions.","authors":"A Faltýnková, O Kudlai, D Jouet, K O'Dwyer, C Pantoja, K Skírnisson","doi":"10.1017/S0022149X25000215","DOIUrl":"10.1017/S0022149X25000215","url":null,"abstract":"Iceland is an isolated, sub-Arctic, oceanic island of volcanic origin in the northern North Atlantic. With a limited faunal diversity and being the most northern point in the distributional range for some species, it is an intriguing model region to study parasite biodiversity and biogeography. Since 2006, there has been a history of intense biodiversity discoveries of freshwater trematodes (Trematoda, Digenea), thanks to the use of integrative taxonomic methods. The majority of digeneans (28 out of 41 known) were characterised with molecular genetic methods and morphological analyses, with some of their life-cycle stages and geographical distribution assessed. A surprising diversity has been discovered, comprising species of the families Allocreadiidae, Cyclocoeliidae, Diplostomidae, Echinostomatidae, Gorgoderidae, Plagiorchiidae, Notocotylidae, Schistosomatidae, and Strigeidae. Many of the recorded species complete their life cycles within Iceland, with three snail species (Ampullaceana balthica, Gyraulus parvus, Physa acuta) known as intermediate hosts. No trematodes endemic for Iceland were found; they appear to be generalists with wide geographical ranges dispersed mainly by migratory birds. Interestingly, fish trematodes recorded in Iceland were found in mainland Europe, indicating that they might be dispersed by anadromous fishes, by human activity, or by migratory birds carrying intermediate hosts. The trematode fauna is mainly Palaearctic, with few species recorded in North America. We highlight the ongoing need for precise species identification via integrative taxonomic methods, which is a baseline for any further ecological studies and adequate epidemiological and conservation measures. Also, there is still a need of obtaining well-preserved vouchers of adults for definite species delimitation.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e33"},"PeriodicalIF":1.3,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143483341","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}

引用次数: 0

Morphology and molecular characterization of a new species of Tereancistrum parasite from the gills of Brycon nattereri. 鳖鳃一新种Tereancistrum寄生虫的形态和分子特征。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-18 DOI: 10.1017/S0022149X25000148

W T Hasuike, B Scorsim, I S Arjona, R B Amaral, L Damacena-Silva, G A Araújo, S Bellay, A V de Oliveira, R M Takemoto

{"title":"Morphology and molecular characterization of a new species of Tereancistrum parasite from the gills of Brycon nattereri.","authors":"W T Hasuike, B Scorsim, I S Arjona, R B Amaral, L Damacena-Silva, G A Araújo, S Bellay, A V de Oliveira, R M Takemoto","doi":"10.1017/S0022149X25000148","DOIUrl":"10.1017/S0022149X25000148","url":null,"abstract":"A new species of Tereancistrum Kritsky, Thatcher & Kayton, 1980, collected from the gills of Brycon nattereri (Bryconidae) in the Cerrado, in the state of Goiás, Brazil, is described based on morphological and molecular data, based on the mitochondrial cytochrome c oxidase subunit 1 (COI) gene region. Tereancistrum campanum n. sp. is distinguished from all its congeners by the unique 'bell-shaped' accessory piece in the male copulatory complex. Molecular analysis revealed that the specimens analyzed formed a distinct group from other Tereancistrum sequences and that the sequences of Tereancistrum kerri showed genetic divergence when compared to T. campanum n. sp., confirming the molecular distinction between the two species. This study also expands the knowledge of parasitic diversity in the Tocantins-Araguaia River Basin and extends the geographical distribution of the genus Tereancistrum. The combination of morphological and genetic data was essential for delimiting this new species, highlighting the importance of integrative approaches in understanding the diversity of monogeneans in freshwater fish in Brazil.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e32"},"PeriodicalIF":1.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143440906","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}

引用次数: 0

First report of a dactylogyrid, Cichlidogyrus sclerosus Paperna & Thurston, 1969 (Monogenoidea) infecting Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) (Cichliformes: Cichlidae) in the United States, with a review of host and locality records in its invasive range and a phylogenetic analysis. 首次报道了美国尼罗罗非鱼，Oreochromis niloticus (Linnaeus, 1758)（鱼形目：鱼科）感染的一种dactylogyrid， Cichlidogyrus sclerosus Paperna & Thurston, 1969 (monogenidea)，并对其入侵范围的宿主和地方记录进行了回顾和系统发育分析。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-18 DOI: 10.1017/S0022149X24000919

J H Brule, M B Warren, S A Bullard

{"title":"First report of a dactylogyrid, Cichlidogyrus sclerosus Paperna & Thurston, 1969 (Monogenoidea) infecting Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) (Cichliformes: Cichlidae) in the United States, with a review of host and locality records in its invasive range and a phylogenetic analysis.","authors":"J H Brule, M B Warren, S A Bullard","doi":"10.1017/S0022149X24000919","DOIUrl":"10.1017/S0022149X24000919","url":null,"abstract":"The parasites of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) are poorly documented in the United States despite the economic importance and global introduction of this African fish. Only one metazoan parasite (Gyrodactylus cichlidarum Paperna, 1968; Gyrodactylidae) reportedly infects Nile tilapia in the United States. Examining Nile tilapia from a flow-through aquaculture system hydrologically linked to Sougahatchee Creek (Tallapoosa River, Auburn, Alabama), we observed a gill infection by Cichlidogyrus sclerosus Paperna & Thurston, 1969 (Dactylogyridae). This monogenoid was originally described from the gill of Mozambique tilapia, Oreochromis mossambicus (Peters, 1852) from Lake Victoria, Uganda. Specimens of C. sclerosus were studied for morphology and phylogenetic analyses using the 28S and ITS1. We identified our specimens as C. sclerosus because they had the following combination of morphological features: marginal hooks shorter than dorsal anchor length; anchor roots reduced; dorsal anchor point bent; dorsal bar pyriform projections approximately half as long as dorsal bar width; penis short (<100 μm), not coiled, tubular, lacking swelling, having irregularly surfaced heel; and accessory piece straight and bifid. Our 28S and ITS1 phylogenies recovered our C. sclerosus sequences in a clade with conspecific sequences and showed no obvious biogeographic pattern. Cichlidogyrus sclerosus reportedly infects 21 fishes of 11 genera and 3 families from 36 countries in Africa, Asia, North America, South America, and Europe. The study of Nile tilapia parasites, especially those exhibiting direct life cycles and low host specificity, is important because they comprise potential invasive species.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e17"},"PeriodicalIF":1.3,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143440902","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}

引用次数: 0

Eye metacercariae in invasive pirarucu Arapaima gigas (Pisces: Arapaimidae): A potential ecological sink interaction? 侵入性巨骨舌鱼（双鱼座：巨骨舌鱼科）的眼囊蚴：潜在的生态汇相互作用？

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-17 DOI: 10.1017/S0022149X25000045

L Franceschini, F G C Dias, B S Miguel, A C Zago, M L Orsi, J R S Vitule, F S de Almeida, F Porto-Foresti, J A Balbuena, I P Ramos, L Casatti

{"title":"Eye metacercariae in invasive pirarucu Arapaima gigas (Pisces: Arapaimidae): A potential ecological sink interaction?","authors":"L Franceschini, F G C Dias, B S Miguel, A C Zago, M L Orsi, J R S Vitule, F S de Almeida, F Porto-Foresti, J A Balbuena, I P Ramos, L Casatti","doi":"10.1017/S0022149X25000045","DOIUrl":"10.1017/S0022149X25000045","url":null,"abstract":"Biological invasions are among the main threats to global biodiversity and present the potential to disrupt host-parasite dynamics. In Brazil, the scientific reports of the occurrence of the Amazonian fish 'pirarucu' (Arapaima gigas) in the upper Paraná River basin, São Paulo state, were made in 2015. However, the effects of its introduction are still unknown, including those associated to its host-parasite relationships. As part of our studies on the possible effects of A. gigas introduction into this basin, the parasites from the eyes of 60 specimens of A. gigas were evaluated. We reported the occurrence of Austrodiplostomum compactum metacercariae (Trematoda, Diplostomidae) parasitizing the eyes of A. gigas supported by morphological and molecular data (COI mtDNA). The new partial sequences had a similarity of 100% to other sequences of Au. compactum previously deposited in Genbank. Five hosts (Prevalence = 8.33%) with a standard length between 69 and 116 cm were infected, with a mean intensity of infection of 31.8 ± 17.2 (1-93). Large infected hosts are unlikely to be a significant prey item for the definitive hosts (medium-sized piscivorous birds), and could act as an 'ecological sink', disrupting the transmission of this metacercariae. Hosts with high infection rates by these metacercariae may present cataracts, exophthalmos, and blindness, resulting in loss of visual acuity. Considering that A. gigas is a carnivorous and visual predator, the low infection observed possibly does not act as a biological filter to hinder or contain the invasion, probably presenting a low negative effect on the visual acuity of hosts.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e30"},"PeriodicalIF":1.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143432833","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}

引用次数: 0

Steinernema keralense n. sp., a new entomopathogenic nematode (Nematoda: Steinernematidae) from India. 印度一种新的昆虫病原线虫（线虫纲：角化线虫科）。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-17 DOI: 10.1017/S0022149X25000136

K M Anes, J Patil, M Babu, N Aarthi, B S Gotyal, A Josephrajkumar, P H Mhatre, J V Sajan, M T Gowda, V Půža

{"title":"Steinernema keralense n. sp., a new entomopathogenic nematode (Nematoda: Steinernematidae) from India.","authors":"K M Anes, J Patil, M Babu, N Aarthi, B S Gotyal, A Josephrajkumar, P H Mhatre, J V Sajan, M T Gowda, V Půža","doi":"10.1017/S0022149X25000136","DOIUrl":"10.1017/S0022149X25000136","url":null,"abstract":"In this study, morphological and molecular features were used to identify a new Steinernema sp. from Kerala, India. Morphological and molecular features provide evidence for placing the new species into the longicaudum clade. The new species is characterized by the following morphological features: infective juveniles with a body length of 1067 μm (914-1268 μm); a distance from the anterior end to excretory pore of 82 μm (73-92 μm); a distance from anterior end to nerve ring of 105 μm (91-118 μm). The distinguishing feature of the infective juveniles of S. keralense n. sp. is the presence of seven ridges in the mid-body region, while all other species classified within the logicaudum clade to date are characterized by eight ridges. The first-generation males are characterised by 25 genital papillae, very short spicules, with a length of 68 μm (60-72 μm), and the SW% ratio is 136 (114-169). The new species is further characterized by sequences of the internal transcribed spacer and partial 28S regions of the ribosomal DNA. Phylogenetic analyses show that S. keralense n. sp. is closely related to species within the longicaudum clade.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e31"},"PeriodicalIF":1.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143433290","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}

引用次数: 0

Digenean life cycle truncation has enabled the opportunistic exploitation of herbivorous fishes. 迪亚纳生命周期的截断使草食性鱼类的机会性开发成为可能。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-17 DOI: 10.1017/S0022149X25000069

D C Huston, S C Cutmore, T H Cribb

{"title":"Digenean life cycle truncation has enabled the opportunistic exploitation of herbivorous fishes.","authors":"D C Huston, S C Cutmore, T H Cribb","doi":"10.1017/S0022149X25000069","DOIUrl":"10.1017/S0022149X25000069","url":null,"abstract":"New, well-known and predicted life cycles for trematodes of the Haploporoidea (Haploporidae and Emprostiotrematidae) and three families of the Lepocreadioidea (Enenteridae, Gorgocephalidae, Gyliauchenidae) involve encystment of the metacercaria in the open (usually on vegetation) followed by ingestion by a range of herbivorous or detritivorous fishes. These life cycles appear among relatively highly derived plagiorchiidan trematodes in which three-host life cycles incorporating an animal second intermediate host are dominant. We hypothesise that the two-host life cycles in the Haploporoidea and Lepocreadioidea arose by secondary truncation of a three-host cycle; the second intermediate host was lost in favour of encystment in the open. Modification of a three-host life cycle effective for the infection of carnivores is consistent with the understanding that fishes arose as carnivores and that multiple lineages have secondarily become detritivores and herbivores. Four of the five trematode families involved infect fishes relating to multiple orders, suggesting a complex history of host-switching. In contrast, the Gorgocephalidae, the smallest of the families, has been found only in a single family, Kyphosidae. The timing of the evolutionary events leading to this putative life cycle truncation is yet to be deduced, but the rich developing understanding of the history of the fishes creates a strong template for future analysis.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e28"},"PeriodicalIF":1.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143432458","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}

引用次数: 0

Receptors for growth and development of Schistosoma mansoni. 曼氏血吸虫生长发育受体。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-14 DOI: 10.1017/S0022149X24001020

Iman F Abou-El-Naga

{"title":"Receptors for growth and development of Schistosoma mansoni.","authors":"Iman F Abou-El-Naga","doi":"10.1017/S0022149X24001020","DOIUrl":"10.1017/S0022149X24001020","url":null,"abstract":"The growth and development of schistosomes are tightly regulated by various receptors throughout their life cycle. Each stage of the parasite inhabits a distinct habitat and responds to different factors that drive its growth and development. With two hosts involved in its life cycle (mammalian and snail), the parasite must go through additional free-living stages to transition between them. Moreover, communication between male and female worms is essential for the maturation of females. The ability of adult schistosomes to survive in human hosts for up to thirty years demonstrates their capacity to efficiently utilize host nutrients for metabolic processes and growth. In Schistosoma mansoni, receptors mediate the utilization of growth factors derived from both the parasite itself and the host. Nuclear receptors, in particular, collaborate with other proteins to regulate the expression of genes essential for various developmental functions. Receptors also play a pivotal role in RNA export, which is crucial for the parasite development. Additionally, neurotransmitter receptors are essential for the growth and development of larval stages. This review aims to elucidate the mechanisms by which these receptors regulate cell proliferation, differentiation, and maturation throughout the parasite life cycle. Understanding these processes could provide insights into the role of receptors in Schistosoma mansoni development and potentially lead to innovative therapeutic strategies to combat human schistosomiasis.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e29"},"PeriodicalIF":1.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414379","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}

引用次数: 0

First molecular characterization of Proctoeces maculatus (Looss, 1901) (Digenea: Fellodistomidae) infecting blue mussels (Mytilus edulis) from the northeastern USA. 美国东北部蓝贻贝（Mytilus edulis）感染的斑纹直纹杆菌（Proctoeces maculatus, loss, 1901）（digeneia: Fellodistomidae）的首次分子鉴定。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-14 DOI: 10.1017/S0022149X25000021

M Titus, I Varetto, C Grosser, E Russo, A Davinack

{"title":"First molecular characterization of Proctoeces maculatus (Looss, 1901) (Digenea: Fellodistomidae) infecting blue mussels (Mytilus edulis) from the northeastern USA.","authors":"M Titus, I Varetto, C Grosser, E Russo, A Davinack","doi":"10.1017/S0022149X25000021","DOIUrl":"10.1017/S0022149X25000021","url":null,"abstract":"The digenetic trematode Proctoeces maculatus is a cosmopolitan parasite that infects various invertebrates and fish hosts, including the blue mussel, Mytilus edulis, along the northeastern U.S. coast. Despite its impact on mussel fitness and the region's aquaculture, little is known about the genetic diversity and connectivity of P. maculatus in this region. This study provides the first genetic characterization of P. maculatus populations in New England using the D1-D3 region of the 28S ribosomal RNA gene. Bayesian phylogenetic analysis and a haplotype network were used to assess genetic variation and connectivity across six localities in Maine, New York, and southern New England, and to compare these populations to global samples. Our results revealed distinct geographic structuring of P. maculatus haplotypes. The ME1 haplotype, unique to Maine, reflects either recent range expansion or isolation driven by environmental and biogeographic factors, such as Cape Cod's role as a phylogeographic barrier. The most common haplotype, US1, was shared by populations in southern New England, New York, and a single specimen from Tunisia, indicating possible historical or anthropogenic connectivity. Two divergent haplotypes from Mississippi and Chile likely represent misidentifications or cryptic species. These findings support the hypothesis that P. maculatus is likely a cryptic species complex. Molecular evidence suggests connectivity across distant regions, emphasizing the role of host movement in parasite dispersal. Continued genetic studies, particularly from under-sampled regions, are needed to unravel the diversity and biogeography of P. maculatus and its potential impact on declining mussel populations.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e25"},"PeriodicalIF":1.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414378","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}

引用次数: 0

First molecular characterisation of a species of Pharyngodon Diesing, 1861 (Nematoda: Pharyngodonidae), and description of Pharyngodon ameivulum n. sp. in a lizard from Caatinga in Brazil. 1861年第一次对一种Pharyngodon Diesing（线虫纲：Pharyngodonidae）的分子特征和巴西Caatinga蜥蜴中Pharyngodon ameivulum n. sp.的描述。

IF 1.3 3区生物学

Journal of Helminthology Pub Date : 2025-02-14 DOI: 10.1017/S0022149X24001007

A C S Ferreira, F M Vieira, M C Diniz, D C N Silva, L B Ribeiro, L C Muniz-Pereira

{"title":"First molecular characterisation of a species of Pharyngodon Diesing, 1861 (Nematoda: Pharyngodonidae), and description of Pharyngodon ameivulum n. sp. in a lizard from Caatinga in Brazil.","authors":"A C S Ferreira, F M Vieira, M C Diniz, D C N Silva, L B Ribeiro, L C Muniz-Pereira","doi":"10.1017/S0022149X24001007","DOIUrl":"10.1017/S0022149X24001007","url":null,"abstract":"This study describes a new species of Pharyngodon Diesing, 1961 (Nematoda: Pharyngodonidae) in teiid lizards Ameivula ocellifera (Spix, 1895) (Squamata: Teiidae) from a Caatinga morphoclimatic domain in the state of Pernambuco, Brazil. Pharyngodon ameivulum n. sp., like 11 other species of the genus, features males without spicules, females with truncated eggs, and no tail spines. However, the new species is distinguished by a unique set of morphological characteristics, such as males possessing three pairs of caudal papillae, with the first pair precloacal, the second adcloacal, and the third postcloacal (arrangement 1:1:1), the second pair (adcloacal) of papillae having a bifurcated distal end, and females with lateral body alae. Molecular analysis of the 18S rDNA, 28S rDNA, and 18S + 28S concatenated sequences genes reveals that P. ameivulum n. sp. clusters with representatives of Pharyngodonidae from the genera Skrjabinodon Inglis, 1968 and Spauligodon Skrjabin, Schikhobalova & Lagodovska, 1960, forming a basal clade to the clade composed of Spauligodon spp. and Skrjabinodon trimorphi Ainsworth, 1990. These are the first phylogenetic assays to include a species of Pharyngodon.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"99 ","pages":"e27"},"PeriodicalIF":1.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414377","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}

引用次数: 0