European journal of protistology最新文献

Contribution to the genus Planometopus (Armophorea, Metopidae), with the description of a new species and the type species 平跖跖足属的贡献（平跖跖足科，平跖跖足亚目），附一新种和模式种的描述。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2026-09-01 Epub Date: 2026-08-14 DOI: 10.1016/j.ejop.2026.126219

Novia Cahyani, Quoc Dung Nguyen, Nanda Dwi Kristanti, Borong Lu, Mann Kyoon Shin

{"title":"Contribution to the genus Planometopus (Armophorea, Metopidae), with the description of a new species and the type species","authors":"Novia Cahyani, Quoc Dung Nguyen, Nanda Dwi Kristanti, Borong Lu, Mann Kyoon Shin","doi":"10.1016/j.ejop.2026.126219","DOIUrl":"10.1016/j.ejop.2026.126219","url":null,"abstract":"<div><div>The family Metopidae Kahl, 1927 comprises diverse anaerobic ciliates, prompting several taxonomic re-evaluations. Among its constituent genera, <em>Planometopus</em> Rotterová et al., 2018 was established as a monotypic genus based on the type species <em>P. contractus</em> (Penard, 1922) Rotterová et al., 2018, and its diagnosis was derived solely from that species. This study presents an integrative revision of this genus, including a new species, <em>Planometopus striatulus</em> n. sp. This new species is characterized by a body size of 100–130 × 50–70 μm in vivo, conspicuous cortical ribs, obliquely arranged somatic kineties comprising 15–22 rows of densely packed dikinetids, an adoral zone with 29–37 membranelles, and an almost entire portion of the perizonal stripe segmented into 71–86 false kineties. The Korean population of <em>P. contractus</em> exhibits a diplostichomonad-type paroral membrane, a feature that has not been described previously. Based on the new species and a comparative reassessment of <em>P. contractus</em>, our results suggest an improved diagnosis of the genus. Body size and the arrangement of somatic dikinetids demonstrate interspecific variability. Furthermore, molecular phylogeny based on 18S rRNA gene sequences robustly confirms the monophyly of <em>Planometopus</em> and supports the distinctiveness of <em>P. striatulus</em> n. sp.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"105 ","pages":"Article 126219"},"PeriodicalIF":1.9,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148911227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Tuberomeba capitovia gen. et sp. nov. (Amoebozoa, Tubulinea) accommodates an incertae sedis lineage of monotactic, fish-associated amoebae Tuberomeba capitovia gen. et sp. 11 .（变形虫，管状目）容纳了一种与鱼相关的单性变形虫的无关联的谱系。

IF 1.9 2区生物学

European journal of protistology Pub Date : 2026-09-01 Epub Date: 2026-08-22 DOI: 10.1016/j.ejop.2026.126222

Uliana Ryabusheva, Maria Palataicova, Alexander Kudryavtsev

引用次数: 0

Distribution patterns of microbial communities along the environmental gradients in the Yangtze River estuary 长江口微生物群落沿环境梯度分布格局

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-06-01 Epub Date: 2026-05-09 DOI: 10.1016/j.ejop.2026.126204

Xuan Lei , Ruixin Zhang , Ying Pan , Zhenzhen Yi

{"title":"Distribution patterns of microbial communities along the environmental gradients in the Yangtze River estuary","authors":"Xuan Lei , Ruixin Zhang , Ying Pan , Zhenzhen Yi","doi":"10.1016/j.ejop.2026.126204","DOIUrl":"10.1016/j.ejop.2026.126204","url":null,"abstract":"<div><div>Microorganisms are vital to trophic dynamics and biogeochemical cycling in estuarine–offshore ecosystems, yet integrated analyses of prokaryotic and microeukaryotic communities across water and sediment habitats remain limited for the Yangtze River Estuary (YRE). We combined 16S and 18S rDNA amplicon sequencing to characterize prokaryotic and microeukaryotic communities in surface water, bottom water, and sediment samples collected along an estuary–offshore transect in the YRE. Microeukaryotes showed higher alpha diversity in the water column than in sediments, whereas prokaryotes were more diverse in sediments. These contrasting diversity patterns were accompanied by clear shifts in dominant taxa, from benthic and anaerobic lineages in sediments and hypoxic bottom waters to phototrophic and copiotrophic groups in nutrient-rich estuarine surface waters. Along the estuary–offshore continuum, salinity, nutrients, and dissolved oxygen were the main drivers of community turnover, with a transition from eutrophic, low-salinity assemblages to saline, oligotrophic, and low-oxygen offshore communities, including potentially harmful dinoflagellates. Co-occurrence networks revealed widespread associations between microeukaryotes and prokaryotes, with microeukaryotes exhibiting a relatively sparse and modular interaction structure and prokaryotes showing a dense, highly clustered, and less compartmentalized network. These findings underscore the combined influence of habitat heterogeneity and environmental gradients on microbial diversity and community structure in the YRE.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"104 ","pages":"Article 126204"},"PeriodicalIF":1.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148101064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Toward a clarified taxonomy of Parentocirrus hortualis (Ciliophora, Hypotrichia): an integrative analysis of ontogenesis, ultrastructure, morphology, and molecular phylogeny 对蜂状卷虫（纤毛虫科，低毛虫科）分类的澄清：个体发生、超微结构、形态和分子系统发育的综合分析。

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-06-01 Epub Date: 2026-05-23 DOI: 10.1016/j.ejop.2026.126207

Jingyi Dong , Wenya Song , Xiaoteng Lu , Weibo Song , Khaled A.S. Al-Rasheid , Alan Warren , Xinpeng Fan , Xiangrui Chen , Xiaotian Luo

{"title":"Toward a clarified taxonomy of Parentocirrus hortualis (Ciliophora, Hypotrichia): an integrative analysis of ontogenesis, ultrastructure, morphology, and molecular phylogeny","authors":"Jingyi Dong , Wenya Song , Xiaoteng Lu , Weibo Song , Khaled A.S. Al-Rasheid , Alan Warren , Xinpeng Fan , Xiangrui Chen , Xiaotian Luo","doi":"10.1016/j.ejop.2026.126207","DOIUrl":"10.1016/j.ejop.2026.126207","url":null,"abstract":"<div><div>There is a paucity of ultrastructural data on hypotrichous ciliates. In the present work, a comprehensive investigation of the ultrastructure, morphology, morphogenesis, and molecular phylogeny of a hypotrichous species, <em>Parentocirrus hortualis</em>, was performed. Historically, the taxonomy of <em>Parentocirrus</em> has been complicated by morphological variability. While <em>P. brasiliensis</em> is nearly identical to the type species <em>P. hortualis</em> in most respects, it differs in the presence of additional dorsal kinetids, a key distinction that now appears unstable. Consequently, we propose that <em>P. brasiliensis</em> should be recognized as a synonym of <em>P. hortualis</em>. In terms of the ultrastructure of <em>P. hortualis</em>, we found that: (1) the semi-rigid or rigid cortex of stylonychine species might be related to the presence of a single or double layer(s) of subpellicular microtubules, respectively; (2) the highly degenerated kinetosome of the dorsal bristle unit, i.e., the parakinetosomal body, has only been observed in two distantly related species of the subfamily Stylonychinae, suggesting this feature might have evolved independently; and (3) the ultrastructure of other organelles, such as the perilemma, buccal lip, buccal seal, and pharyngeal disks, was also documented. This is the first report on the ultrastructural features of <em>P. hortualis</em> and of the genus <em>Parentocirrus</em>, which should help improve the diagnosis and definition of this widely distributed species.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"104 ","pages":"Article 126207"},"PeriodicalIF":1.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148223987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Iron availability modulates ferric reduction oxidase (FRO) gene expression in the toxic dinoflagellate Alexandrium pacificum 铁的有效性调节有毒的太平洋亚历山大藻中的铁还原氧化酶（FRO）基因表达。

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-06-01 Epub Date: 2026-05-20 DOI: 10.1016/j.ejop.2026.126208

Quynh Thi Nhu Bui , Han-Sol Kim , Sofia Abassi , Hee-Jin Kang , Jang-Seu Ki

{"title":"Iron availability modulates ferric reduction oxidase (FRO) gene expression in the toxic dinoflagellate Alexandrium pacificum","authors":"Quynh Thi Nhu Bui , Han-Sol Kim , Sofia Abassi , Hee-Jin Kang , Jang-Seu Ki","doi":"10.1016/j.ejop.2026.126208","DOIUrl":"10.1016/j.ejop.2026.126208","url":null,"abstract":"<div><div>Iron (Fe) is an essential element for living organisms and plays a central role in numerous biological processes. Although Fe uptake mechanisms have been extensively characterized in plants, they remain poorly understood in microalgae, particularly in dinoflagellates. In this study, we identified two novel ferric reduction oxidase genes (<em>FROs</em>) in the marine dinoflagellate <em>Alexandrium pacificum</em> (designated <em>ApFRO1</em> and <em>ApFRO2</em>) and examined their expression under varying Fe conditions. <em>ApFRO1</em> and <em>ApFRO2</em> encode open reading frames of 2205 bp and 2688 bp, respectively, each containing ferric reductase family domains. Both proteins possess multiple transmembrane regions, consistent with predicted localization at the plasma membrane. Significant differences in cell growth were observed across Fe treatments. Strong upregulation of both <em>ApFROs</em> (up to 34.9-fold) occurred under Fe-depleted conditions over a three-day period. Both Fe deficiency and Fe excess reduced chlorophyll autofluorescence (CAF), indicating impaired photosynthetic performance. Together, these findings demonstrate that fluctuations in Fe availability markedly influence the physiology of <em>A. pacificum</em>, and that cells activate an Fe<sup>3+</sup>-reductase-mediated Fe acquisition pathway involving <em>FROs</em>.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"104 ","pages":"Article 126208"},"PeriodicalIF":1.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148041620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Collaria spinifila sp. nov.: A new species of myxomycete from the urban environment of Shanghai, China 刺毛虫sp. nov.：上海城市环境黏菌一新种。

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-06-01 Epub Date: 2026-05-18 DOI: 10.1016/j.ejop.2026.126206

Wen-Long Song, Min-Li Cai, Shuang-Lin Chen

{"title":"Collaria spinifila sp. nov.: A new species of myxomycete from the urban environment of Shanghai, China","authors":"Wen-Long Song, Min-Li Cai, Shuang-Lin Chen","doi":"10.1016/j.ejop.2026.126206","DOIUrl":"10.1016/j.ejop.2026.126206","url":null,"abstract":"<div><div>The myxomycete genus <em>Collaria</em> has long received limited research attention and is frequently confused morphologically with the genera <em>Comatricha</em> and <em>Lamproderma</em>. During a myxomycete diversity survey in Shanghai, China, two distinctive specimens were obtained via moist chamber cultures of leaf litter collected from Gongqing National Forest Park. These specimens are characterized by an early-deciduous peridium leaving a distinct and persistent basal collar, a columella that terminates abruptly near the middle of the sporotheca and branches near its apex to form the capillitium, and capillitial threads bearing conspicuous spinose, dentate, or semi-annulate ornamentation at their free ends. Based on detailed morphological examination and a comprehensive comparison with all known species of both <em>Collaria</em> and <em>Comatricha</em>, this taxon is considered to represent a new species. Although attempts to obtain DNA sequences (nuclear 18S rDNA, translation elongation factor 1-alpha, and mitochondrial ribosomal small subunit RNA genes) using universal primers for dark-spored myxomycetes were unsuccessful, thereby preventing the determination of its molecular phylogenetic position, its stable combination of morphological characteristics aligns it more closely with the current concept of <em>Collaria</em>. Consequently, it is formally described here as the new species <em>Collaria spinifila</em>. Detailed photographic plates and a taxonomic discussion are provided.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"104 ","pages":"Article 126206"},"PeriodicalIF":1.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148149118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Eltonia chernetsovi gen. et sp. nov. (Heterolobosea, Eutetramitea) from an ecologically diverse clade comprising closely related soil and seawater species Eltonia chernetsovi gen. et sp. 11 . （Heterolobosea, eutetritia）来自一个生态多样化的分支，包括密切相关的土壤和海水物种。

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-04-01 Epub Date: 2026-01-26 DOI: 10.1016/j.ejop.2026.126183

Ekaterina Piven , Alexander Kudryavtsev

{"title":"Eltonia chernetsovi gen. et sp. nov. (Heterolobosea, Eutetramitea) from an ecologically diverse clade comprising closely related soil and seawater species","authors":"Ekaterina Piven , Alexander Kudryavtsev","doi":"10.1016/j.ejop.2026.126183","DOIUrl":"10.1016/j.ejop.2026.126183","url":null,"abstract":"<div><div>A novel amoeboid protist, <em>Eltonia chernetsovi</em> gen. nov., sp. nov., was isolated from saline mud collected in the Elton Lake area, Russia (ca. 200–500‰) and characterized morphologically and molecularly. Only amoeboid cells and cysts were found. In amoebae, eruptive cytoplasmic flow and hyaline bulging are evident during non-directional movement. Cysts are spherical with a smooth wall. The nucleus has a large eccentric nucleolus. Experimental analysis of salinity tolerance shows that the strain, initially observed and cultivated in seawater with a salinity of 40‰, may survive freshwater conditions in an encysted form, but does not reproduce in freshwater conditions below 5‰ or in hypersaline conditions at 70‰ or higher. Amoebae demonstrate a short period of reproduction at a temperature of 37 °C; however, they rapidly encyst afterwards. Phylogenetic analyses of the SSU rRNA gene and ITS region place the new strain in a clade with two undescribed species from agricultural soil habitats, suggesting a broad range of biotopes where representatives of this clade may occasionally occur. We establish a new genus for this clade, which branches within Eutetramitea (Heterolobosea) and is related to the marine <em>Oramoeba fumarolia</em>, cf. <em>Stachyamoeba</em> sp. ATCC 50324, and the soil species <em>Vrihiamoeba italica</em>.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"103 ","pages":"Article 126183"},"PeriodicalIF":1.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146156040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Azadinium fusiforme, a new species of Amphidomataceae from Korean and Japanese coastal waters that lacks azaspiracid production 缺氮吡嗪酸的朝鲜和日本沿海水域的一新种Azadinium fususiforme

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-04-01 Epub Date: 2026-01-26 DOI: 10.1016/j.ejop.2026.126182

Urban Tillmann , Koyo Kuwata , Kyoungwon Cho , Kazuya Takahashi , Jan Tebben , Bernd Krock , Mitsunori Iwataki , Sunju Kim

{"title":"Azadinium fusiforme, a new species of Amphidomataceae from Korean and Japanese coastal waters that lacks azaspiracid production","authors":"Urban Tillmann , Koyo Kuwata , Kyoungwon Cho , Kazuya Takahashi , Jan Tebben , Bernd Krock , Mitsunori Iwataki , Sunju Kim","doi":"10.1016/j.ejop.2026.126182","DOIUrl":"10.1016/j.ejop.2026.126182","url":null,"abstract":"<div><div>The dinophyte family Amphidomataceae, comprising the genera <em>Azadinium</em> and <em>Amphidoma</em>, includes several species known to produce azaspiracids (AZAs), a group of lipophilic marine biotoxins associated with shellfish poisoning. Despite their ecological relevance and the increasing number of newly described species in recent years, their diversity is likely still underestimated, and knowledge of their global distribution and biogeography remains limited. Based on detailed morphological and phylogenetic analyses of strains from Korea and Japan, we describe <em>Azadinium fusiforme</em> sp. nov., a taxon that corresponds to the phylogenetic position of a strain previously reported from Japan. Light and scanning electron microscopy revealed that <em>Az. fusiforme</em> possesses a unique combination of morphological traits that distinguish it from its congeners. Notably, the ventral pore is located on the left side of the first apical plate, the pyrenoid is consistently positioned in the posteriormost part of the cell, the nucleus is elongated and centrally located, and pronounced thickenings occur along the sutures between the lateral and dorsal apical plates. Molecular data place <em>Az. fusiforme</em> in a well-supported, distinct clade within <em>Azadinium</em>, clearly supporting its designation as a new species. Mass spectrometric analyses showed no evidence of AZA production in any of the <em>Az. fusiforme</em> strains. This study contributes to a more fundamental understanding of the species diversity, distribution, and potential toxicity of Amphidomataceae in the Asia–Pacific region.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"103 ","pages":"Article 126182"},"PeriodicalIF":1.6,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146164575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Bioaccumulation of gadolinium in Tetrahymena: Phagocytotic uptake leads to the formation of gadolinium phosphate–organic composite particles 钆在四膜虫体内的生物积累：吞噬摄取导致磷酸钆-有机复合颗粒的形成

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ejop.2025.126176

Jana Kohl-Chandramohan , Michael Schweikert , Tobias Junginger , Ingo Hartenbach , Norbert Klaas , Marie-Louise Lemloh

{"title":"Bioaccumulation of gadolinium in Tetrahymena: Phagocytotic uptake leads to the formation of gadolinium phosphate–organic composite particles","authors":"Jana Kohl-Chandramohan , Michael Schweikert , Tobias Junginger , Ingo Hartenbach , Norbert Klaas , Marie-Louise Lemloh","doi":"10.1016/j.ejop.2025.126176","DOIUrl":"10.1016/j.ejop.2025.126176","url":null,"abstract":"<div><div>The mechanisms of bioaccumulation in eukaryotic cells, along with the understanding of pathways and metal binding, are fundamental to advances in both basic and applied research. The ciliate <em>Tetrahymena pyriformis</em> bioaccumulates the rare earth element gadolinium (Gd) into food vacuoles and subsequently excretes Gd-containing particles. We investigated the uptake mechanism of Gd in detail and characterised the properties of the resulting biogenic particles. Our results demonstrate that <em>T. pyriformis</em> accumulates Gd<sup>3+</sup> ions via phagocytosis, with components of the organic cell culture medium playing a central role in mediating the uptake of Gd<sup>3+</sup> ions. Bioaccumulation occurred in cells cultivated in Gd<sup>3+</sup>-containing environmental water samples and in standard cell culture medium containing proteose peptone, but was absent when Gd<sup>3+</sup> ions were applied in complexed form, such as gadolinium-based contrast agents. The bioaccumulated and excreted microparticles are amorphous, display magnetic properties, and can be isolated. They consist of about 70 wt% amorphous gadolinium phosphate, 25–27 wt% organic material, and 3 wt% combined Ca, K, Mg, and Na. The individual components can be fractionated based on their solubility. These insights into microbial bioaccumulation of metal elements enhance our understanding of environmental elemental cycles and could provide new strategies for element recovery.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"102 ","pages":"Article 126176"},"PeriodicalIF":1.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145750087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Systematic reassessment of Ambiphrya and Apiosoma (Ciliophora, Peritrichia), with morpho-molecular characterization of two epibiotic ciliates from rainbow trout in Korea 韩国虹鳟鱼两种表生纤毛虫的形态-分子特征及其对两种纤毛虫的系统重新评价

IF 1.6 2区生物学

European journal of protistology Pub Date : 2026-02-01 Epub Date: 2026-01-06 DOI: 10.1016/j.ejop.2026.126180

Borong Lu , Hunter N. Hines , Weibo Song , Mann Kyoon Shin

{"title":"Systematic reassessment of Ambiphrya and Apiosoma (Ciliophora, Peritrichia), with morpho-molecular characterization of two epibiotic ciliates from rainbow trout in Korea","authors":"Borong Lu , Hunter N. Hines , Weibo Song , Mann Kyoon Shin","doi":"10.1016/j.ejop.2026.126180","DOIUrl":"10.1016/j.ejop.2026.126180","url":null,"abstract":"<div><div>Many peritrich ciliates are parasites of, or epibionts on, aquatic animals. Among them, the genera <em>Ambiphrya</em> and <em>Apiosoma</em> are common fish ectocommensals in aquacultures. Here, we report infections by two poorly known forms, <em>Ambiphrya</em> cf. <em>ameiuri</em> and <em>Apiosoma pseudopiscicola</em>, on rainbow trout, a commonly farmed and economically important food fish in South Korea, and provide detailed descriptions and diagnostic illustrations of both species. Their SSU rDNA sequences were obtained, filling the molecular data gap for <em>Apiosoma</em>, a genus for which no sequences had previously been available. Our phylogenetic analysis supports the exclusion of <em>Ambiphrya</em> from the family Scyphidiidae, although its familial placement remains unresolved. The valid species of <em>Ambiphrya</em> are clarified, and populations identified as <em>Ambiphrya ameiuri</em> appear to represent a species complex. The family rank of Apiosomatidae, proposed by Jankowski (2007) but not widely adopted, is validated. Our findings confirm that <em>Apiosoma</em> belongs to Apiosomatidae rather than to the family Epistylididae in the widely used classifications of Corliss (1979) and Lynn (2008). <em>Parapiosoma</em>, previously of uncertain familial placement, should likewise be assigned to Apiosomatidae. Notably, the proposed synonymization of Scyphidiidae with Apiosomatidae, as well as the inclusion of other genera in Apiosomatidae by Jankowski (2007), is unsupported.</div></div>","PeriodicalId":12042,"journal":{"name":"European journal of protistology","volume":"102 ","pages":"Article 126180"},"PeriodicalIF":1.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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