Journal of Helminthology最新文献_第9页

Patterns of antiparasitic usage in Golden Retriever breed of dogs: A 9-year cohort study. 金毛猎犬品种犬抗寄生虫使用模式：一项9年队列研究。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-18 DOI: 10.1017/S0022149X26101710

M J Oladoye, B Awosile, O Adekoya, H Rodriguez-Mori, O Akinkuotu

{"title":"Patterns of antiparasitic usage in Golden Retriever breed of dogs: A 9-year cohort study.","authors":"M J Oladoye, B Awosile, O Adekoya, H Rodriguez-Mori, O Akinkuotu","doi":"10.1017/S0022149X26101710","DOIUrl":"https://doi.org/10.1017/S0022149X26101710","url":null,"abstract":"Antiparasitic agents are routinely used in companion animal medicine. However, longitudinal evidence describing real-world usage patterns in dogs remains limited. This study aimed to characterise patterns, routes of administration, temporal trends, and seasonal variation in antiparasitic drug use among Golden Retrievers enrolled in a large prospective cohort study in the United States. A descriptive analysis was conducted to summarise antiparasitic usage data from the Morris Animal Foundation's Golden Retriever Lifetime Study over nine study years (corresponding to years 0 to 8). Percentages with respective 95% CI were used to summarise drug types, therapy combinations, routes of administration, and temporal and seasonal patterns of use. A total of 17,715 antiparasitic use records were analysed. Drug usage pattern was highly concentrated within a limited number of products, with the ivermectin-pyrantel pamoate combination accounting for 23.0% of all recorded use. Other commonly used agents included afoxolaner (9.73%), metronidazole (9.16%), and lufenuron-milbemycin oxime (8.95%). Oral formulations were predominant, representing 65.28% of all administrations. Single-agent therapy accounted for 47.27% of use, while two-drug combination therapy represented 46.65%. The antiparasitic medications spanned multiple pharmacological classes targeting both endo- and ectoparasites, including anthelmintics, ectoparasiticides, and antiprotozoals. Antiparasitic use declined by 1.8% over the study period. We observed a seasonal variation in antiparasitic drug usage, with higher usage during cooler months (winter) and lower use in summer. These findings provide baseline evidence of the burden of endoparasites and ectoparasites in Golden Retriever dogs and highlight the need for stewardship-oriented parasite control strategies in companion animal practice.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e68"},"PeriodicalIF":2.0,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148271842","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

Integrative taxonomy of Thripinema usitatum n. sp., a new entomoparasitic nematode associated with the bean flower thrips Megalurothrips usitatus in China. 与豆花蓟马（Megalurothrips usitatus）有关的新虫寄生线虫的综合分类。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-18 DOI: 10.1017/S0022149X26101515

W-H Chen, W-J Qiu, Y-F Lu, W-H Wu, H-P Pan, C-L Xu

{"title":"Integrative taxonomy of Thripinema usitatum n. sp., a new entomoparasitic nematode associated with the bean flower thrips Megalurothrips usitatus in China.","authors":"W-H Chen, W-J Qiu, Y-F Lu, W-H Wu, H-P Pan, C-L Xu","doi":"10.1017/S0022149X26101515","DOIUrl":"https://doi.org/10.1017/S0022149X26101515","url":null,"abstract":"A new species of thrips-parasitic nematode, Thripinema usitatum n. sp. (Tylenchomorpha: Allantonematinae), is described from thrips collected from flowers in Hainan Province, China. The species is identified using an integrative approach combining detailed morphology, molecular phylogenetic analyses, and biological observations. Thripinema usitatum n. sp. exhibits pronounced sexual dimorphism and a complex life cycle, including obese parasitic females, vermiform infective females, and free-living males with degenerate feeding structures within the body of thrips. The new species is distinguished from its congeners by the absence of a stylet in free-living males, a distinctive two-part bursa extending nearly to the tail terminus, and characteristic shapes of parasitic females and male tails. Molecular characterization was performed using three markers (18S rRNA, 28S D2-D3 rRNA, and mitochondrial cytochrome c oxidase subunit I, mtCOI). Phylogenetic analyses based on 28S D2-D3 rRNA and mtCOI partial sequences consistently recovered T. usitatum n. sp. as a well-supported, monophyletic lineage clearly separated from other entomophilic nematodes. Among the markers examined, mtCOI provided the highest discriminatory power. Biological observations revealed that T. usitatum n. sp. infects thrips at all developmental stages, with a strong prevalence in adult females. Multiple nematode life stages frequently co-occurred within individual hosts, and infection intensities ranged from 1 to 433 nematodes per thrips. These results expand the known diversity of Thripinema and provide a robust framework for future systematic and ecological studies of thrips-parasitic nematodes.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e59"},"PeriodicalIF":2.0,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148271813","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

When pooling fails: low-intensity Angiostrongylus cantonensis infections in Theba pisana result in false-negativity. 当汇集失败时：在底巴pisana中低强度的广州管圆线虫感染导致假阴性。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-17 DOI: 10.1017/S0022149X26101588

L Anettová, S Jaume-Ramis, C Paredes-Esquivel, D Modry

引用次数: 0

Investigating a Sprague-Dawley rat-based anthelmintic assay using Trichostrongylus colubriformis. 研究了一种以Sprague-Dawley大鼠为基础的使用色状毛圆线虫的驱虫剂测定方法。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-17 DOI: 10.1017/S0022149X26101679

Grethe Neethling, Daryl Codron, Luther van der Mescht

{"title":"Investigating a Sprague-Dawley rat-based anthelmintic assay using Trichostrongylus colubriformis.","authors":"Grethe Neethling, Daryl Codron, Luther van der Mescht","doi":"10.1017/S0022149X26101679","DOIUrl":"https://doi.org/10.1017/S0022149X26101679","url":null,"abstract":"In vivo anthelmintic assay models are essential for evaluating candidate compounds in target species. Several rodent-helminth systems have been developed, with the Cobb-Wistar rat-T. colubriformis model emerging as promising for early-stage screening. Although this model has demonstrated utility, the development of an alternative model using a more widely accessible rat strain represents a valuable opportunity for advancing in vivo screening of anthelmintics. This study evaluated different immunosuppressants and regimens to identify treatments yielding the highest and most consistent worm burdens in experimentally infected Sprague-Dawley rats. Thirty rats were assigned to five groups (n = 6). Group 1 received unmedicated feed (negative control), while Groups 2, 3, and 4 received hydrocortisone acetate (HCA) in their diet at 60 ppm, 80 ppm, and a two-phase regimen of 200 ppm followed by 60 ppm, respectively. Group 5 received intramuscular methylprednisolone acetate (MPA) on three occasions. All animals were orally infected with T. colubriformis third-stage larvae, and necropsies were performed on Day 13 post-infection to recover worm burdens. Treatment had no effect on worm counts. The 80-ppm HCA group produced the highest mean burden with high variance; the 200:60 ppm group showed lower counts but less variance, and the 60-ppm HCA and MPA groups were comparable to controls. There was insufficient evidence to support the Sprague-Dawley rat-T. colubriformis model but, given the results of this study, further investigation and development are warranted.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e67"},"PeriodicalIF":2.0,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148264720","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

Avoidance of parasites by blue mussels Mytilus edulis: effect of parasite species and chemosensory cues. 蓝贻贝（Mytilus edulis）对寄生虫的躲避：寄生虫种类和化学感觉线索的影响。

IF 1.6 3区生物学

Journal of Helminthology Pub Date : 2026-06-16 DOI: 10.1017/S0022149X26101643

P Kibak, K N Mouritsen

{"title":"Avoidance of parasites by blue mussels Mytilus edulis: effect of parasite species and chemosensory cues.","authors":"P Kibak, K N Mouritsen","doi":"10.1017/S0022149X26101643","DOIUrl":"https://doi.org/10.1017/S0022149X26101643","url":null,"abstract":"The concept of 'ecology of fear' recognises the importance of non-consumptive effects of predators inspiring fear in their prey, but has subsequently been broadened to include the non-consumptive effects of parasites on their hosts. Here, we experimentally tested whether blue mussels (Mytilus edulis) exhibit species-specific avoidance behaviour in response to infective transmission stages (cercariae) of three trematode species: Himasthla elongata and Renicola roscovita, both of which use blue mussels as hosts, and Cryptocotyle lingua, which parasitises fish. Furthermore, we investigated whether avoidance behaviour could be triggered solely by chemical cues. The results show that mussels reduced clearance rates by 34% in the presence of H. elongata alone and of 51% in the presence of H. elongata and R. roscovita in sympatry, which was comparable to previously reported direct consumptive effects of infection on filtration activity. The presence of C. lingua and R. roscovita alone had no significant effect on clearance rate. The observed reduction in filtration activity resulted in lower infection rates of experimental mussels. Moreover, mussels reduced clearance rates by 42% in the mere presence of chemical cues from the first intermediate host Littorina littorea, while exudates of H. elongata had no additional negative effect. It is evident that a non-consumptive parasite effect can significantly reduce the filtration activity of experimental blue mussels. Considering the magnitude of this reduction and the widespread occurrence of parasitic trematodes, it is reasonable to expect that fear of parasitism has ecological consequences for the functioning role of mussels.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e62"},"PeriodicalIF":1.6,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148257861","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

Draft whole-genome and mitochondrial genome assemblies of Steinernema tarimense and Heterorhabditis sp. XJ-55. 绘制tarimense和Heterorhabditis sp. XJ-55的全基因组和线粒体基因组组装图。

IF 1.6 3区生物学

Journal of Helminthology Pub Date : 2026-06-16 DOI: 10.1017/S0022149X26101667

F Zhan, C Shen, I M Mundock, Y Ren, H Li, Q Xue, W Guo

{"title":"Draft whole-genome and mitochondrial genome assemblies of Steinernema tarimense and Heterorhabditis sp. XJ-55.","authors":"F Zhan, C Shen, I M Mundock, Y Ren, H Li, Q Xue, W Guo","doi":"10.1017/S0022149X26101667","DOIUrl":"https://doi.org/10.1017/S0022149X26101667","url":null,"abstract":"Entomopathogenic nematodes (EPNs) from the genera Steinernema and Heterorhabditis are potent biocontrol agents. They kill insects through a unique symbiosis with pathogenic bacteria (Xenorhabdus or Photorhabdus), making them ideal for integrated pest management due to their broad host range and environmental safety. Despite high species diversity, genomic resources for these nematodes remain limited. The aim of this study was to characterise the nuclear and mitochondrial genomes of a newly described species, S. tarimense, and a putative novel Heterorhabditis species (strain XJ-55), both obtained from Xinjiang, China. A comprehensive genomic annotation and analysis were conducted to investigate the evolutionary origins of insect parasitism and the molecular adaptation mechanisms involved in host-parasite interactions. Through Illumina sequencing and de novo assembly, we obtained fragmented yet biologically informative genomes for both species. The assembly of S. tarimense reached a BUSCO completeness of 84.06% with an estimated genome size of 84.27 Mb, while that of Heterorhabditis sp. XJ-55 achieved 92.28% completeness with an estimated size of 75.11 Mb. Functional annotation revealed conserved metabolic profiles between the two species, with the Metabolism category being the most abundant. Mitochondrial genomes were successfully reconstructed using MitoZ and NOVOPlasty, resulting in a complete mitogenome of S. tarimense (13,836 bp) and a partial mitogenome of Heterorhabditis sp. XJ-55 (16,865 bp). Comparative mitogenomic analysis highlighted characteristic features such as pronounced A+T bias and distinct codon usage patterns, providing new evolutionary insights into these genera. These genomic resources establish a foundation for future comparative studies and functional investigations, with promising implications for enhancing the biological control efficacy of EPNs in sustainable agricultural systems.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e63"},"PeriodicalIF":1.6,"publicationDate":"2026-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148258192","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

Insights into the life cycles of trematodes infecting pelagic gastropods in Japan. 深入了解感染日本远洋腹足动物的吸虫的生命周期。

IF 1.6 3区生物学

Journal of Helminthology Pub Date : 2026-06-15 DOI: 10.1017/S0022149X26101564

Hakuyu Sekine, Yuzo Ota, Sho Toshino, Masato Nitta, Gaku Yamamoto, Hiroaki Fukumori, Daishi Yamazaki, Tsuyoshi Takano, Tsukasa Waki

{"title":"Insights into the life cycles of trematodes infecting pelagic gastropods in Japan.","authors":"Hakuyu Sekine, Yuzo Ota, Sho Toshino, Masato Nitta, Gaku Yamamoto, Hiroaki Fukumori, Daishi Yamazaki, Tsuyoshi Takano, Tsukasa Waki","doi":"10.1017/S0022149X26101564","DOIUrl":"https://doi.org/10.1017/S0022149X26101564","url":null,"abstract":"Pelagic gastropods, including holoplanktonic and neustonic species, have been considered potential sources of trematodes that parasitize marine fishes. However, the taxonomy and life cycles of metacercariae detected in pelagic gastropods remain poorly understood. This study examined metacercaria infections in 10 species of pelagic gastropods (N = 415) collected from Japanese coastal waters between 2016 and 2025. Metacercariae were detected in four pelagic gastropod species and were identified as seven trematode species based on molecular analyses of the 28S ribosomal RNA and cytochrome c oxidase subunit 1 regions. In holoplanktonic gastropods, six species within the family Lepocreadiidae were molecularly identified as Cephalolepidapedon saba, Prodistomum orientale, Prodistomum sp., Opechona sp., Preptetos sp., and Lepocreadiidae gen. sp., all of which represent new host-parasite records. A metacercaria molecularly identified as Dinurus tornatus (Hemiuridae) was detected in the neustonic gastropod Glaucus atlanticus. These results confirm that pelagic gastropods can act as the second intermediate or paratenic hosts and suggest predator-prey relationships with marine fishes. In addition, rediae obtained from benthic gastropods (cowries) were examined molecularly and identified as Prodistomum sp., thereby clarifying aspects of its life cycle.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e60"},"PeriodicalIF":1.6,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148251982","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

Influence of crude extracts from different thermally treated Hysterothylacium thalassini L3 larvae on liver pathology and immune responses in C57BL/6 mice. 不同热处理法海宫囊蚴L3幼虫粗提物对C57BL/6小鼠肝脏病理及免疫应答的影响

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-06-15 DOI: 10.1017/S0022149X26101497

R Abdel-Gaber, M Alotaibi, M Albeshr, M A Dkhil, S Santourlidis, A O Elghamdy, S Al-Quraishy, E M Al-Shaebi

{"title":"Influence of crude extracts from different thermally treated Hysterothylacium thalassini L3 larvae on liver pathology and immune responses in C57BL/6 mice.","authors":"R Abdel-Gaber, M Alotaibi, M Albeshr, M A Dkhil, S Santourlidis, A O Elghamdy, S Al-Quraishy, E M Al-Shaebi","doi":"10.1017/S0022149X26101497","DOIUrl":"10.1017/S0022149X26101497","url":null,"abstract":"Hysterothylacium thalassini third-stage larvae (L3), commonly found in marine fish, are known to induce liver injury, oxidative stress, and immune disturbances when transmitted to mammalian hosts. This study investigated the pathological effects of purified crude extracts derived from fresh, heat-treated, and frozen L3 larvae on liver function, oxidative status, and immune responses in a murine model. Thirty Saurida tumbil fish were examined for L3 larvae, which were processed under three conditions: fresh (24 ± 2 °C for 60 min), heat-treated (100 °C for 60 min), and frozen (-20 °C for 24 h). Twenty male C57BL/6 mice were randomly allocated into four groups and inoculated with larval extracts at a 14-day interval. Mice exposed to fresh larval extracts exhibited significant weight loss, elevated liver enzymes (ALT, AST, ALP), hyperglycemia, and reduced total protein levels, alongside severe hepatic damage characterized by necrosis and inflammatory infiltration. Antioxidant enzyme activities (CAT and SOD) were markedly decreased, whereas oxidative stress markers (NO and H₂O₂) were increased. Additionally, there was significant upregulation of iNOS, TNF-α, and IL-10 gene expression, accompanied by elevated iNOS, IL-10, and IgE protein levels, indicating strong inflammatory and Th2-type immune responses. In contrast, extracts from heat-treated and frozen larvae resulted in attenuated pathological effects, including improved liver function, reduced oxidative stress, and moderated immune responses. These findings demonstrate that untreated L3 larval extracts exert pronounced hepatotoxic and immunomodulatory effects, while thermal and freezing treatments significantly reduce their pathogenicity and support immune homeostasis, highlighting potential strategies to mitigate parasite-induced host damage.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e64"},"PeriodicalIF":2.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148251937","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

Not-so-frequent flyers? Restricted avian dispersal of Diplostomum parasites across North Atlantic islands. Not-so-frequent传单吗?北大西洋岛屿上蝶口虫寄生物的鸟类传播受限。

IF 1.6 3区生物学

Journal of Helminthology Pub Date : 2026-06-09 DOI: 10.1017/S0022149X26101631

A Diaz-Suarez, L Pukk, M Lauringson, L J Hansen, K Raundrup, N P Huffeldt, A Vasemägi

{"title":"Not-so-frequent flyers? Restricted avian dispersal of Diplostomum parasites across North Atlantic islands.","authors":"A Diaz-Suarez, L Pukk, M Lauringson, L J Hansen, K Raundrup, N P Huffeldt, A Vasemägi","doi":"10.1017/S0022149X26101631","DOIUrl":"10.1017/S0022149X26101631","url":null,"abstract":"Migratory hosts are key vectors of long-distance parasite dispersal. In the North Atlantic, migratory connectivity of avian hosts suggests that diplostomid trematodes with broad host specificity could potentially exhibit widespread distributions. However, host migration does not necessarily result in successful parasite dispersal. We investigated the diversity and distribution of Diplostomum spp. infecting freshwater salmonids in Greenland and the Faroe Islands using a metabarcoding approach. In Greenland, infection prevalence in Arctic char and Atlantic salmon ranged from 0% to 100% across locations. Molecular analysis revealed four lineages, including the first records of Diplostomum sp. 6, 7, and 9 (Locke et al. 2010a; 2010b), and a novel lineage/species showing 92.6-94.2% sequence identity to its closest relatives. In contrast, no evidence of diplostomid infection was found in brown trout and Atlantic salmon collected from sixteen streams in the Faroe Islands. The presence of a novel, locally abundant (28.9% prevalence) parasite lineage/species in Greenland, the affinity of these parasite assemblages with those in North America, the lack of overlap with Icelandic and Norwegian communities, and the absence of diplostomids in Faroese salmonids indicate limited bird-mediated dispersal of diplostomids across the North Atlantic. We propose that a 'short transmission window' at high latitudes during the breeding season, combined with specific avian migration routes, may limit long-distance dispersal and promote regional isolation between Nearctic and Palearctic diplostomid communities across the North Atlantic.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e58"},"PeriodicalIF":1.6,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148205197","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

Hidden in the dark: description of Calicotyle carmenae n. sp. (Monogenea: Monocotylidae) from deepwater catsharks (Elasmobranchii: Pentanchidae) off Iceland. 隐藏在黑暗中：对冰岛深海猫鲨（板鲨目：板鲨科）的萼子叶类carmenae n. sp.（单子叶科）的描述。

IF 2 3区生物学

Journal of Helminthology Pub Date : 2026-05-29 DOI: 10.1017/S0022149X26101527

Andrea Higueruelo, Sara Dallarés, Bjoern C Schaeffner

{"title":"Hidden in the dark: description of Calicotyle carmenae n. sp. (Monogenea: Monocotylidae) from deepwater catsharks (Elasmobranchii: Pentanchidae) off Iceland.","authors":"Andrea Higueruelo, Sara Dallarés, Bjoern C Schaeffner","doi":"10.1017/S0022149X26101527","DOIUrl":"10.1017/S0022149X26101527","url":null,"abstract":"A new species of Calicotyle (Monogenea: Monocotylidae) is described from three deepwater catshark species (Elasmobranchii: Pentanchidae) collected off Iceland. Calicotyle carmenae n. sp. is diagnosed as a species of Calicotyle possessing a haptor with one central and seven peripheral loculi, two hamuli, and several hooklets. It is distinguished from all congeners by the absence of eye spots, having a once-looped male copulatory organ, two U-shaped vaginae, and intercaecal vaginal pores. A molecular phylogenetic analysis based on 28S ribosomal DNA sequences placed Calicotyle carmenae n. sp. within a clade of other Calicotyle species infecting selachians and holocephalans, while revealing clear genetic divergence from these congeners (8.2-11.1%; 74-99 bp). In addition, the morphology and host specificity of C. carmenae and its congeners are discussed. Some inconsistencies and insufficiently described anatomical features in other species of the subfamily Calicotylinae are highlighted, which evidence a need for a revision of this taxon. The study also provides the first record of a species of Calicotyle from pentanchid sharks, highlighting the potential for further discoveries as research expands into different hosts and deeper, underexplored marine ecosystems.","PeriodicalId":15928,"journal":{"name":"Journal of Helminthology","volume":"100 ","pages":"e57"},"PeriodicalIF":2.0,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148054997","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