Parasitology最新文献

{"title":"Palaeogenomic analysis reveals helminth infections in pre-Columbian individuals consistent with fisher-gatherer subsistence at the Jabuticabeira II <i>sambaqui</i>, Southern Brazil.","authors":"Jyan Cardoso Araújo, Lorrayne Samille Santos Brito, Marcelo Pires, Carolina Furtado, Alena Mayo Iñiguez","doi":"10.1017/S0031182026101863","DOIUrl":"10.1017/S0031182026101863","url":null,"abstract":"<p><p>The <i>sambaqui</i> (shellmounds) people are recognized as fisher-gatherers who inhabited the coastal regions of Brazil, with a subsistence on a diet composed of fish, molluscs, and plants. Paleoparasitological investigations in these open-air sites are challenged by the severe taphonomic processes affecting parasite vestige preservation. Previous palaeogenetic work reported parasite helminth infection by <i>Ascaris</i> sp. in an individual from Jabuticabeira II (JABII) <i>sambaqui</i>, located in the Santa Catarina state, Brazil (2890 ± 55 to 1805 ± 65 years BP). To expand our knowledge about helminth infections in <i>sambaqui</i> people, this study applied a palaeogenomics approach in JABII. Sediments from pelvic and sacral regions of 3 JABII individuals and environmental samples underwent ancient DNA extraction and <i>cox</i>1 gene PCRs. High-throughput sequencing data were compared to a custom-built reference database. The JABII dataset revealed reads that are mapped against plathelminth and nematode parasites. Plathelminth observations are probably attributable to pseudo-parasitism and are associated with the animal hosts identified within the JABII faunal assemblages. Two JABII individuals exhibited <i>Anisakis simplex, Contracaecum osculatum</i>, and <i>Ascaris</i> sp. Anisakids are common parasites of marine fish, crustaceans, and mammals that infect humans by consuming fish. Most of the fish identified at the JABII site are currently documented as being infected by Anisakidae. <i>Ascaris</i> sp. is verified in different JABII individuals from the previous study, confirming the spread of this soil-transmitted helminthiasis. The novel data herein agree with the subsistence of the JABII fisher-gatherers, the sedentary lifestyle and the faunal surroundings in the Southern coastal region of Brazil.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-12"},"PeriodicalIF":2.4,"publicationDate":"2026-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147504578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transgenic approaches in the pathogenic free-living amoebae: what are the hurdles?","authors":"Jillian E M McKeon, Caroline M Palmentiero, Colm P Roster, Jaelin Ammerall, Jennifer M Mason, James C Morris","doi":"10.1017/S0031182026101772","DOIUrl":"10.1017/S0031182026101772","url":null,"abstract":"<p><p><i>Naegleria fowleri, Acanthamoeba</i> spp., <i>Balamuthia mandrillaris</i> and <i>Sappinia</i> spp. are free-living amoebae that can infect humans and cause serious disease; therefore, these organisms are commonly referred to as pathogenic free-living amoebae (pFLA). Diagnosis and treatment of pFLA infections have historically been very challenging. If a diagnosis is made, treatment regimens currently include a combination of antifungals, antimicrobials and anticancer agents that have, to date, proven to be of little help in resolving the disease. Discovery of new therapies is critical to reduce the >90% mortality rate for the brain infections that these microbes can cause. Molecular tools that allow for the study of gene function, generation of reporter cell lines and drug target validation would greatly improve drug discovery efforts. To date, transfection approaches for use with pFLA have been limited, hindering these types of molecular studies. Based on sequence comparisons, the pFLA harbour proteins that are involved in cargo delivery to the nucleus and DNA repair mechanisms, suggesting that fundamental pathways believed to be required for stable transfection are present. However, the amoebae lack homologs to genes connected to stable maintenance of transgenes and RNA interference in other systems. While these differences may limit our ability to alter gene expression, it is also possible that unrecognized components fulfill the roles of the missing homologs. Given the value of robust transfection approaches in drug discovery and gene function studies, resolving these mechanisms would be impactful, leading to improved understanding of amoebae biology and enhancement of drug discovery efforts.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-13"},"PeriodicalIF":2.5,"publicationDate":"2026-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13315211/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147390464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Redescription of <i>Alloceraea cretacea</i> (Acari: Ixodida) with an additional nymphal fossil added to this species: novel insights into the evolution of the Haematobothrion.","authors":"Lidia Chitimia-Dobler, Constantin Mey, Danilo Harms, Jörg U Hammel, Jason Dunlop, Ulrich Kotthoff, Ben J Mans","doi":"10.1017/S0031182026101826","DOIUrl":"10.1017/S0031182026101826","url":null,"abstract":"<p><p>A fossil assigned to the extant ixodid genus <i>Haemaphysalis</i> was previously described from the Late Cretaceous (ca. 99 Ma) Burmese amber. <i>Haemaphysalis</i> (<i>Alloceraea</i>) <i>cretacea</i> was considered the oldest, and only, fossil representative of this genus. Significant criticism was raised regarding possible misidentification of this amber fossil. Microtomography of the original holotype and new material allows new perspectives on this controversy. A new fossil nymph is described and both fossils are considered <i>Alloceraea cretacea</i> comb. nov. nymphs based on a series of morphological characters: no genital aperture, eyeless, 11 festoons, coxa I simple with a short, wide triangular spur. Specific morphological features for the 'structurally primitive' <i>Alloceraea</i> are discussed and include palpi elongate, with long setae on palps, the hypostome dorsally longer than the chelicera and the corona visible distally and with a specific distribution of the denticles. <i>Alloceraea</i> and its sister genus <i>Archaeocroton</i> (that includes amber fossil taxa), share a common ancestor with <i>Haemaphysalis</i> sensu stricto, indicating a minimum divergence time of at least 100 MYA for these lineages. In addition, a fossil of <i>Bothriocroton</i> has also been described from Burmese amber. This genus with <i>Cryptocroton</i> groups basal to the <i>Alloceraea</i>/<i>Archaecroton-Haemaphysalis</i> assemblage forming a monophyletic clade named Haematobothrion. A synthesis of the fossil information and the current systematic understanding of the Haematobothrion allows new hypotheses about the origins of this group and the various lineages it comprises. Notably that the major Haematobothrion lineages originated and diverged during the time period when the Burma terrane was migrating from Australia to Asia.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-8"},"PeriodicalIF":2.5,"publicationDate":"2026-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13315209/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147355791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Return to the sea: <i>Sagaratrema</i> n. g. for the marine Liolopidae (Digenea: Diplostomida) with two new species parasitic in snakes from Sri Lanka.","authors":"Manage Lenin Indrajith De Silva, Erandi Pathirana, Jayanthe Rajapakse, Storm Martin","doi":"10.1017/S0031182026101802","DOIUrl":"10.1017/S0031182026101802","url":null,"abstract":"<p><p>The Liolopidae Dollfus, 1934 is a small family of digenetic trematodes with sexual adults parasitic in aquatic reptiles and amphibians. Liolopids exploiting snakes are constrained to <i>Harmotrema</i> Nicoll, 1914, but the genus includes species with presumably freshwater life cycles parasitic in terrestrial snakes as well as species with presumably marine life cycles parasitic in viviparous sea snakes and amphibious kraits. We hypothesize that this ecological distinction implies substantial separation in evolutionary history and propose <i>Sagaratrema</i> De Silva, Pathirana & Martin n. g. to accommodate the liolopids in marine snakes. Three species are delineated through an integrated approach, from novel collections of viviparous sea snakes in Sri Lanka, <i>Sagaratrema rajapaksei</i> De Silva, Pathirana & Martin n. sp., <i>Sagaratrema rajakarunae</i> De Silva, Pathirana & Martin n. sp. and <i>Sagaratrema indicum</i> (Chattapadhyaya, 1970) n. comb. (= <i>H. indica</i>) originally reported from India. Three other species known from marine snakes are transferred from <i>Harmotrema</i> to the new genus: <i>S. laticaudae</i> (Yamaguti, 1933) n. comb. (designated as the type-species), <i>S. eugari</i> (Tubangui & Masilungan, 1936) n. comb. and <i>S. linguiforme</i> (Wang, 1987) n. comb. (= <i>H. linguiforme</i>). The 3 species from Sri Lanka are similarly genetically distinct in sympatry as each is relative to <i>S. laticaudae</i> from Japan. Following these proposals, <i>Harmotrema</i> is revised and rendered monotypic for the type-species <i>H. infecundum</i>. Morphologically, <i>Sagaratrema</i> is distinguished from <i>Harmotrema</i> and other liolopid genera by the arrangement of the excretory vesicles, distribution of the vitellarium and size and shape of the body.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-17"},"PeriodicalIF":2.5,"publicationDate":"2026-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13315225/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147348842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Night soil fertilizer use and parasitic infections in ancient China: a preliminary study of agricultural practices, economic factors and disease ecology in the Song dynasty.","authors":"Chen Chen, Anthea Yu Xuan Lee, Edward Kien Yee Yapp, Hui-Yuan Yeh","doi":"10.1017/S0031182026101784","DOIUrl":"10.1017/S0031182026101784","url":null,"abstract":"<p><p>This study examines the relationship between parasitic infections and agricultural innovations in China during the Song dynasty (960-1279 CE), particularly how the widespread use of night soil (human excrement) as fertilizer affected public health. The introduction of Champa rice and the expansion of double cropping systems substantially increased agricultural productivity and supported population growth but also intensified human-environment interactions that facilitated parasite transmission. The night soil was routinely transported from urban to rural areas to improve soil fertility and crop production, but its untreated application facilitated the local and regional spread of intestinal parasites. Analysis of Song dynasty historical records, including (<i>Peaceful Holy Benevolent Prescriptions</i>), (<i>Classified Herbal Medicine</i>), (<i>Chen Fu's Agricultural Book</i>), reveals a well-developed body of pharmacological knowledge regarding parasitic infections, suggesting that they were a significant health concern. Together with archaeoparasitological findings, this study identifies intestinal parasites - including <i>Ascaris lumbricoides, Trichuris trichiura, Clonorchis sinensis, Enterobius vermicularis</i> and <i>Taenia</i> spp. - as likely to be prevalent during the Song dynasty. Moreover, variations in food consumption, agricultural practices and sanitation systems contributed to distinct regional patterns of parasitic infections. By integrating archaeological data with historical sources, this study demonstrates how agricultural intensification and urban development during the Song dynasty created environmental conditions conducive to pathogen survival, advancing our understanding of the health costs brought by agricultural expansion in ancient China.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.4,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147326642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Temperature driving a mass killer: assessing the risk of trematode outbreaks for New Zealand seabirds.","authors":"Jerusha Bennett, Mikey Little, Jane Kitson, Robert Lewis, Sally Carson, Jake Edwards-Ingle, Robert Poulin","doi":"10.1017/S0031182026101796","DOIUrl":"10.1017/S0031182026101796","url":null,"abstract":"<p><p>Global warming is widely recognized as a key driver of current and future changes in marine ecosystems. Parasitic trematodes are highly sensitive to temperature changes, which can lead to drastic impacts on surrounding communities. <i>Copiatestes</i> spp. (Family Syncoelidae) are relatively little-known trematodes with atypical life cycles that have been associated with a mass mortality event of seabirds in the Chatham Islands. As they forage at sea, seabirds get their legs tangled with the sticky, free-living infective stages of <i>Copiatestes</i>, which impairs their ability to take off and land. We tested the impact of seasonally fluctuating sea temperature on the dynamics of <i>Copiatestes thyrsitae</i> at various life stages (infecting second-intermediate host, <i>Nyctiphanes australis</i> euphausiid, and the third free-living infective stage in the water column) by sampling plankton biweekly for 12 months in Otago Harbour, New Zealand. We reveal that higher temperatures are significantly correlated with increases in prevalence and abundance of <i>Copiatestes</i> infections in euphausiids, with a rapid response observed within days to weeks following temperature increases. No correlation was observed between temperature and abundance of free-living stages. Infected euphausiids were smaller in size compared to uninfected individuals. The higher infection levels in euphausiids following warmer temperatures suggest a heightened risk of entanglement for coastal seabirds at these times. Smaller-bodied, surface-feeding seabird species that consume euphausiids are particularly at risk of entanglement. Our findings suggest that even short-term heatwaves can lead to higher risk of seabirds being entangled with <i>Copiatestes</i> filaments, with potentially dire ecological consequences during mass parasite releases.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.5,"publicationDate":"2026-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13315222/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147309041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoparasitology of historical toilets and mummies in South Korea: trends and perspectives.","authors":"Jong Ha Hong, Yangsu Yi, Min Seo, Seung Hee Baek, Jinseong Han, Hisashi Fujita, Chang Seok Oh, Dong Hoon Shin","doi":"10.1017/S0031182026101760","DOIUrl":"10.1017/S0031182026101760","url":null,"abstract":"<p><p>Paleoparasitology has emerged as a discipline situated at the intersection of anthropology, archaeology, public health and medical science. In South Korea, research on mummies over the past few decades has yielded critical insights into historical parasite infections. Parasitological analysis of intestinal contents from well-preserved Joseon-period mummies, largely representing individuals of the upper social classes, has enabled the direct identification of parasite taxa and estimation of infection prevalence in pre-modern Korea. Beyond mummies, parasitological examinations of toilet remains have enabled reconstructions of parasitic infection dynamics in pre-modern Korean society. No toilet structures have been identified from Neolithic sites in Korea, although coprolites recovered from shell middens provide key evidence for this period. With the rise of the Three Kingdoms, archaeological evidence indicates the construction and use of increasingly sophisticated toilet facilities, including cesspit and flush-type systems, which continued to develop in later historical periods. Toilets dating to the late Joseon Dynasty and the early 20th century frequently contain coprolite samples heavily infested with parasite eggs, and their detection has confirmed the presence of toilets at otherwise uncertain archaeological sites. Across both mummy and toilet contexts, commonly identified parasites include soil-transmitted helminths such as <i>Ascaris lumbricoides</i> and <i>Trichuris trichiura</i>, as well as food-borne trematodes, reflecting long-term interactions among sanitation practices, subsistence strategies and human health in Korea.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-13"},"PeriodicalIF":2.4,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146228106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoparasitological analysis on animal-origin coprolites from the Moche archaeological site Licapa II, Chicama Valley, Peru (450-900 AD).","authors":"Darío Alejandro Ramirez, Carito Tavera Medina, Henry Tantaleán, Rodrigo Nores","doi":"10.1017/S0031182026101681","DOIUrl":"10.1017/S0031182026101681","url":null,"abstract":"<p><p>Paleoparasitological research has allowed the recovery and identification of parasite structures like helminth eggs, protozoan oocysts, arthropod remains, as well as parasite ancient DNA molecules preserved in human and animal-origin archaeological material from Peruvian contexts. However, these studies are still scarce in the region despite its potential to trace parasite infections and diseases through history, and to help understand ecological relationships in the past. Here, we examined 36 coprolites from rodents and South American camelids recovered from a test pit, through light microscopy-based paleoparasitological methods, in order to characterize the parasite diversity existing at the Licapa II Moche site. The results allowed us to identify six parasite taxa, including <i>Eimeria macusaniensis</i>, acantocephala, strongylids, Dioctophymatidae, possibly <i>Paraspidodera</i> sp. and <i>Diphyllobotrium</i>/<i>Adenocephalus</i>. One of these species, <i>E. macusaniensis</i>, allowed us to confirm the zooarchaeological origin of some coprolites as belonging to South American camelids. The urbanization and certain practices, such as the breeding of these animals by Andean societies, would explain the occurrence of these parasites at the site, while also prompting consideration of their potential effects on the health of camelids and rodents, in which parasite disease is today a major concern. Similarly, they suggest risks of zoonotic diseases to which the people who lived there in the past may have been exposed.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-9"},"PeriodicalIF":2.4,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146213827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prevalence of zoonotic nematode <i>Calodium hepaticum</i> varies with small mammal community diversity across a heterogenous landscape in Eastern Uganda.","authors":"Emilia Johnson, Diana Ajambo, Maria Capstick, Moses Arinaitwe, Olivia Ericsson, Fred Besigye, Jayna Raghwani, Tristan P W Dennis, Ronald Bogere, Andrina Nankasi, Alon Atuhaire, Candia Rowell, Annet Namukuta, Asmin Mohamed, Moses Adriko, Poppy Lamberton, Edridah Tukahebwa, Kathryn J Allan, Christina Faust","doi":"10.1017/S0031182026101723","DOIUrl":"10.1017/S0031182026101723","url":null,"abstract":"<p><p><i>Calodium hepaticum</i> (syn. <i>Capillaria hepatica</i>) is a generalist nematode that infects liver parenchyma of mammals worldwide and can cause human infections. Prevalence ranges from 0% to 100% in wildlife across small geographic areas, making it an ideal parasite for understanding ecological drivers of variation given intensive land use or cover change. Here, we quantify prevalence of <i>Calodium hepaticum</i> and present initial surveys of synanthropic small mammals. Cross-sectional rodent trapping was conducted within and around households over 2 consecutive dry seasons in 4 villages with differing land cover. DNA was extracted from liver tissue and the 18s rRNA gene of <i>C. hepaticum</i> was amplified to confirm presence of <i>C. hepaticum.</i> Landscape structural diversity was classified by tree crown density and mean canopy height derived from 30 m LiDAR data within a 0.5 km buffer. Multivariable binomial generalized linear models were fit to <i>C. hepaticum</i> prevalence. <i>Calodium hepaticum</i> infection was common (overall 34.5%, CI 95%: 27.9-41.0) and found in rodent and shrew species inside and outside residences. We observe village-level differences in prevalence (18.2-75.0%), with higher <i>C. hepaticum</i> prevalence associated with lower relative proportion of native rodent species to <i>Rattus rattus</i> (adjusted OR = 0.55, CI 95%: 0.33-0.92). Host diversity appears to be protective against parasite prevalence. Differences in molecular and gross parasitological identification highlight challenges in diagnosis and a need for more specialized molecular tools. Further investigation is required to understand individual host and community variation in pathogen infection intensity and implications for zoonotic risk.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-13"},"PeriodicalIF":2.5,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13244227/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146213753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology and DNA sequences reveal a new species of <i>Clavellotis</i> (Copepoda: Lernaeopodidae) as a parasite of three species of sparids in the Yucatán Peninsula, Mexico.","authors":"Betzi F Pérez-Ortega, Juan F Espínola-Novelo, Raúl Castro-Romero, Martin Miguel Montes, Gerardo Pérez-Ponce de León","doi":"10.1017/S0031182026101735","DOIUrl":"10.1017/S0031182026101735","url":null,"abstract":"<p><p>Species of genus <i>Clavellotis</i> (Castro-Romero & Baeza-Kuroki, ) are parasites of marine fishes across the world. During the course of a survey on the metazoan parasites of marine fish across the Yucatán Peninsula, Mexico, specimens of a lerneapodid copepod consistent with the concept of <i>Clavelotis</i> were collected from the gills of three species of sparids, and were described as a new species using morphological and molecular characters. <i>Clavellotis mayae</i> n. sp. represents the second species of the genus reported in Mexican coastal waters. The new species morphologically resembles <i>C. dubius</i> and <i>C. sebastidis</i> in the trunk shape but can be readily distinguished by having a short maxilla which is separated to its distal end, a sub-oval and conspicuously larger aliform process, and a distal margin of the trunk bearing pronounced subcircular flaps covering the attachment sites of the egg sacs. The new species further differs from all other known congeners by having a short genital process and mandibles without secondary dentition. Molecular analyses through 28S rDNA and <i>cox</i>1 sequences further corroborate all these morphological distinctions and support the taxonomic placement of the new species within <i>Clavellotis</i>. The relationships of this species with other congeners are discussed in light of molecular evidence.</p>","PeriodicalId":19967,"journal":{"name":"Parasitology","volume":" ","pages":"1-14"},"PeriodicalIF":2.5,"publicationDate":"2026-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13244225/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146213816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}