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Parallel functional reduction in the mitochondria of apicomplexan parasites Eur. J. Protistol. (IF 2.9) Pub Date : 2024-03-09 Patrick J. Keeling, Mahara Mtawali, Morelia Trznadel, Samuel J. Livingston, Kevin C. Wakeman
Extreme functional reduction of mitochondria has taken place in parallel in many distantly related lineages of eukaryotes, leading to a number of recurring metabolic states with variously lost electron transport chain (ETC) complexes, loss of the tricarboxylic acid (TCA) cycle, and/or loss of the mitochondrial genome. The resulting mitochondria-related organelles (MROs) are generally structurally reduced
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Redescription and molecular phylogeny of Trochilia sigmoides Dujardin, 1841 (Ciliophora, Cyrtophoria) collected from South Korea Eur. J. Protistol. (IF 2.9) Pub Date : 2024-02-28 Ji Hye Choi, Atef Omar, Jae-Ho Jung
During a survey of Korean marine ciliates, , the type species of the genus , was collected and examined using in vivo observation and protargol impregnation. Moreover, scanning electron microscopy and 18S rRNA gene sequencing have been applied for the first time to study this species. Morphologically, is characterized by the small body size, the oval body outline, and the spiral dorsal ridges. The
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A new centrohelid heliozoan Pterocystis polycristalepis sp. nov. and taxonomic and phylogenetic concerns within Pterista (Haptista: Centroplasthelida) Eur. J. Protistol. (IF 2.9) Pub Date : 2024-02-20 Dmitry G. Zagumyonnyi, Denis V. Tikhonenkov
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Rumen ciliates (Ciliophora, Trichostomatia) in Brazilian domestic cattle feed diets with crescent urea levels Eur. J. Protistol. (IF 2.9) Pub Date : 2024-02-12 Franciane Cedrola, Suyane Costa Bordim, Pedro Braga Arcuri, Jailton da Costa Carneiro, Roberto Júnio Pedroso Dias
Since their discovery, rumen ciliates of domestic cattle were reported in various geographic locations and several host species. However, until now there is only one taxonomic inventory of ciliates associated with Brazilian cattle. Thus, the present study aimed to access the ciliate composition, relative abundance, richness, and density of rumen ciliates of Brazilian cattle feeding diets supplemented
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Single-cell transcriptomic analysis reveals genome evolution in predatory litostomatean ciliates Eur. J. Protistol. (IF 2.9) Pub Date : 2024-02-05 Zhaorui Zhou, Chao Li, Qingxiang Yuan, Yong Chi, Yuqing Li, Ying Yan, Saleh A. Al-Farraj, Naomi A. Stover, Zigui Chen, Xiao Chen
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Nuclear genome of dinoflagellates: Size variation and insights into evolutionary mechanisms Eur. J. Protistol. (IF 2.9) Pub Date : 2024-02-03 Hui Wang, Peiling Wu, Lu Xiong, Han-Sol Kim, Jin Ho Kim, Jang-Seu Ki
Recent progress in high-throughput sequencing technologies has dramatically increased availability of genome data for prokaryotes and eukaryotes. Dinoflagellates have distinct chromosomes and a huge genome size, which make their genomic analysis complicated. Here, we reviewed the nuclear genomes of core dinoflagellates, focusing on genome and cell size for their evolutionary relationships and events
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Newly identified diversity of Dinomycetaceae (Rhizophydiales, Chytridiomycota), a family of fungal parasites of marine dinoflagellates Eur. J. Protistol. (IF 2.9) Pub Date : 2024-01-26 Alan Denis Fernández-Valero, Sergey A. Karpov, Nagore Sampedro, Jordina Gordi, Natàlia Timoneda, Esther Garcés, Albert Reñé
We identified two new parasite species of Chytridiomycota isolated during blooms of the dinoflagellate Alexandrium minutum in the coastal Mediterranean Sea. Light and electron microscopy together with molecular characterization of the nuclear 18S, ITS, and 28S rDNA regions led to their identification as two new species, Dinomyces gilberthii and Paradinomyces evelyniae, both belonging to the family
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Lighting lantern above Psalteriomonadidae: Unveiling novel diversity within the genus Psalteriomonas (Discoba: Heterolobosea) Eur. J. Protistol. (IF 2.9) Pub Date : 2024-01-10 Martina Foučková, Kristýna Uhrová, Aneta Kubánková, Tomáš Pánek, Ivan Čepička
Psalteriomonadidae are a small family of anaerobic free-living protists belonging to Heterolobosea, Discoba. We cultured 74 new strains of mostly amoeboid Psalteriomonadidae obtained from mainly freshwater habitats and sequenced their 18S rRNA gene. Based on the phylogenetic analysis and genetic distances, we report multiple novel species, four of which we formally describe based on the light-microscopic
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It's time to consider the Arcellinida shell as a weapon Eur. J. Protistol. (IF 2.9) Pub Date : 2024-01-02 Kenneth Dumack, Enrique Lara, Clément Duckert, Elizaveta Ermolaeva, Ferry Siemensma, David Singer, Valentyna Krashevska, Mariusz Lamentowicz, Edward A.D. Mitchell
The shells of testate amoebae are morphologically diverse and persistent in the environment. Accordingly, the examination of the morphology and composition of shells became a standard tool in ecological, palaeoecological, and evolutionary studies. However, so far the function of the shell remains poorly understood and, although based on limited evidence, the shell was considered as a defense mechanism
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The first arctic strain of Rhizochromulina: Morphology, ultrastructure, and position in the evolutionary tree of the order Rhizochromulinales (Heterokontophyta, Dictyochophyceae) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-12-17 Pavel Safonov, Mariia Berdieva, Elena Nassonova, Sergei Skarlato, Ilya Pozdnyakov
Rhizochromulina marina is a unicellular amoeboid alga capable of forming flagellate cells; it is a single validly named species in the genus. Besides, there are numerous environmental sequences and undescribed strains designated as Rhizochromulina sp. or R. marina. The biogeography of the genus is understudied: rhizochromulines from the Indian, Southern, and Arctic Oceans are unknown. Here, we present
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Testate amoebae (Arcellinida, Amoebozoa) community diversity in New England bogs and fens assessed through lineage-specific amplicon sequencing Eur. J. Protistol. (IF 2.9) Pub Date : 2023-12-15 Olivia K. Dufour, Evie Hoffman, Robin S. Sleith, Laura A. Katz, Agnes K.M. Weiner, Taylor R. Sehein
Testate amoebae (order Arcellinida) are abundant in freshwater ecosystems, including low pH bogs and fens. Within these environments, Arcellinida are considered top predators in microbial food webs and their tests are useful bioindicators of paleoclimatic changes and anthropogenic pollutants. Accurate species identifications and characterizations of diversity are important for studies of paleoclimate
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Description of Holostichides (Extraholostichides) eastensis tianjinensis subgen. nov. subspec. nov. (Ciliophora, Hypotricha) from northern China Eur. J. Protistol. (IF 2.9) Pub Date : 2023-12-12 Ziyan Liu, Ziyu Wang, Qi Zhang, Qiukun Wang, Fengchao Li
The morphology and morphogenesis of a new urostylid, Holostichides (Extraholostichides) eastensis tianjinensis subgen. nov. subspec. nov. were analyzed. The new subspecies differs from the nominotypical subspecies H. (Extraholostichides) eastensis eastensis Wang et al., 2022 by the relatively long frontoterminal row (about 60% vs. 30% of body length), colorless cortical granules (vs. dark brown), two
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Morphology and molecular phylogeny of two hypotrichous ciliates (Ciliophora, Spirotrichea) from South Korea, including Hemiurosomoida koreana n. sp. Eur. J. Protistol. (IF 2.9) Pub Date : 2023-12-06 Atef Omar, Ji Hye Moon, Jae-Ho Jung
The living morphology, infraciliature, and molecular phylogeny of a new soil ciliate, Hemiurosomoida koreana n. sp., discovered in a sample collected from a mountain in the northeast of South Korea, were investigated. The new species possesses the characteristics of the genus Hemiurosomoida, i.e., a reduced number of frontal-ventral-transverse cirri, three dorsal kineties of which kineties 1 and 2
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Morphology, morphogenesis, and molecular phylogeny of Aspidisca koreana n. sp. (Ciliophora, Euplotida) from South Korea Eur. J. Protistol. (IF 2.9) Pub Date : 2023-12-01 Ji Hye Choi, Atef Omar, Jae-Ho Jung
The morphology, morphogenesis, and molecular phylogeny of a new ciliate, Aspidisca koreana n. sp., discovered in the eastern coast of South Korea, were investigated. The morphological description is based on the observation of living cells, 4′-6-diamidino-2-phenylindole (DAPI) and silver-stained specimens (e.g., protargol, silver nitrate), and scanning electron micrographs. The new species is characterized
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Morphology and molecular phylogeny of two new species of Psammophaga (Rhizaria, Foraminifera) from the west coast of India Eur. J. Protistol. (IF 2.9) Pub Date : 2023-11-21 Tushar Kaushik, Vaishnavi Dixit, Thirumalai Murugan
Benthic foraminifera are unicellular eukaryotic protists that construct an organic, agglutinated, or calcareous test wall. Although single-chambered (monothalamous) foraminifera are ubiquitous in marine habitats worldwide, they are poorly known compared to their multi-chambered relatives, notably from the tropical marine environments of India. In this study, we describe two new species of marine monothalamid
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Copterus tyloloricatus (Ciliophora, Suctorea), a new suctorian genus and species Eur. J. Protistol. (IF 2.9) Pub Date : 2023-11-20 Igor Dovgal, Atsushi Yamaguchi, Daiki Kojima, Yoshinari Endo
We present the description of the new suctorian genus Copterus gen. n. with type species Copterus tyloloricatus sp. n. from the family Acinetidae, inhabiting the prosomes and urosomes of calanoid copepods from the northern North Pacific Ocean. The new taxon is characterized by (i) an ellipsoidal to triangular, asymmetric, dorsoventrally flattened cell body, which lies horizontally on the lorica surface;
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Novel cercozoan and heterolobosean protists from the rhizosphere and phyllosphere of two endemic cacti from the Atacama Desert Eur. J. Protistol. (IF 2.9) Pub Date : 2023-11-13 Eduardo Acosta, Victoria Fincke, Frank Nitsche, Hartmut Arndt
Cercozoans and heterolobose amoebae are found across terrestrial habitats where they feed on other unicellular microbes, including bacteria, fungi and microalgae. They constitute a significant fraction of soil ecosystems and are integral members of plant microbiota. Here, we present the results on the isolation of protozoans from the rhizosphere and phyllosphere of Browningia candelaris (Meyen) in
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Genome-wide identification and in-silico analysis of papain-family cysteine protease encoding genes in Tetrahymena thermophila Eur. J. Protistol. (IF 2.9) Pub Date : 2023-11-08 Şeyma DURAN, Ayça Fulya ÜSTÜNTANIR DEDE, Yeliz DÜNDAR ORHAN, Muhittin ARSLANYOLU
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Re-isolation and revaluation of boundaries of Thecamoeba terricola Greeff, 1886 (Amoebozoa, Discosea, Thecamoebida), with description of Thecamoeba vicaria n. sp. Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-28 Yelisei Mesentsev, Alina Surkova, Oksana Kamyshatskaya, Elena Nassonova, Alexey Smirnov
We studied a large species of Thecamoeba found in a glass dish with soaked moss and obtained 18s rRNA gene sequence of this organism. Morphologically, the strain was most similar to T. terricola sensu Page, but had significant differences in cell size and nuclear morphology. A more complete similarity was found with the original description of “Amoeba terricola” by Greeff, as well as with Penard’s
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Acanthamoeba castellanii trophozoites escape killing by neutrophil extracellular traps using their 3′-nucleotidase/nuclease activity Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-31 Luiz Fernando Carvalho-Kelly, Anita Leocadio Freitas-Mesquita, Michelle T.C. Nascimento, Claudia F. Dick, Eduarda de Souza-Maciel, Natalia C. Rochael, Elvira M. Saraiva, José Roberto Meyer-Fernandes
Acanthamoeba castellanii is a free-living amoeba that acts as an opportunistic pathogen for humans and is the pathogenic agent of Acanthamoeba keratitis (AK). A. castellanii may present as proliferative and infective trophozoites or as resistant cysts during their life cycle. The immune response against AK is still poorly explored; however, it is well established that macrophages and neutrophils play
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Morphological, ontogenetic, and phylogenetic research of a poorly known non-dorsomarginalian ciliate: Erniella filiformis Foissner, 1987 (Protista, Ciliophora, Hypotrichia) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-29 Yurui Wang, Jingyi Wang, Banghe Wang, Kunwu Wang, Chen Shao
Erniella Foissner, 1987 is a poorly known genus with its available information limited solely to morphological characteristics. In this study, the type species E. filiformis, isolated from highly saline water in China, was investigated for morphology, morphogenesis, and phylogeny based on small subunit ribosomal DNA sequences. The main characteristic events during morphogenesis in Erniella filiformis
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Two new species of the genus Leptomyxa (Goodey, 1915) – Leptomyxa botanica n. sp. and Leptomyxa monrepos n. sp. from the soil habitats of Northwestern Russia Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-27 Nikita S. Kulishkin, Alexey V. Smirnov, David J. Patterson
Amoebae of the genus Leptomyxa have variable morphologies and can only be reliably identified using molecular data. However, species distinction based on the 18S rRNA gene sequence is difficult due to the very low level of sequence divergence among morphologically different species. The database for other genes is much smaller, and genomic data on Leptomyxa is almost absent. In this study, we describe
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Phylogenetic position of the pelobiont Mastigamoeba aspera and revision of the family Mastigamoebidae (Archamoebae, Pelobiontida) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-26 Ludmila V. Chistyakova, Alexei Yu. Kostygov, Andrew V. Goodkov, Anton V. Radaev, Alexander O. Frolov
In this study, we presented the results of our molecular phylogenetic analysis of Archamoebae using a newly obtained sequence of the 18S rRNA gene of Mastigamoeba aspera, the type species of the genus. In addition, we characterized the general organization of the tubulin cytoskeleton of M. aspera by immunofluorescent microscopy and TEM. Our findings allowed us to revise the family Mastigamoebidae and
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Editorial: After 15 years, it is time for a change Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-20 Thomas Weisse
Abstract not available
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Identification and characterization of an ectophosphatase activity involved in Acanthamoeba castellanii adhesion to host cells Eur. J. Protistol. (IF 2.9) Pub Date : 2023-10-13 Luiz Fernando Carvalho-Kelly, Anita Leocadio Freitas-Mesquita, Clara Ferreira Pralon, Eduarda de Souza-Maciel, José Roberto Meyer-Fernandes
Acanthamoeba castellanii is a free-living amoeba and an opportunistic pathogen for humans that can cause encephalitis and, more commonly, Acanthamoeba keratitis. During its life cycle, A. castellanii may present as proliferative and infective trophozoites or resistant cysts. The adhesion of trophozoites to host cells is a key first step in the pathogenesis of infection. A major virulence protein of
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Morphology and phylogeny of four trachelocercid ciliates (Ciliophora, Karyorelictea, Trachelocercidae) from North China Sea, with description of a new species Eur. J. Protistol. (IF 2.9) Pub Date : 2023-09-16 Tingting Ye, Wen Song, Yuqing Li, Khaled A.S. Al-Rasheid, Valentina Serra, Mingzhen Ma
Trachelocercids are common ciliates in marine sandy intertidal zones, however, only few species have been described using modern taxonomic techniques, with several earlier descriptions still lacking primary data, such as a detailed description of the oral ciliature. For this reason, systematics of the family Trachelocercidae Kent, 1881 resulted in paraphyletic genera and needs a critical revision.
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Phylogenetic and morphological diversity of free-living diplomonads Eur. J. Protistol. (IF 2.9) Pub Date : 2023-09-15 Eva Mazancová, Eliška Zadrobílková, Naoji Yubuki, Ivan Čepička
Diplomonadida is a lineage of anaerobic protists belonging to Fornicata, Metamonada. Most diplomonads are endobiotic or parasitic, such as Giardia intestinalis, which is a famous human pathogen, but several free-living species exist as well. Although it has been proposed that the free-living diplomonads are descendants of endobiotic organisms and thus interesting from the evolutionary point of view
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The odd couple of protistology: Edward Heron-Allen (1861–1943) and Arthur Earland (1866–1958) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-09-14 John R. Dolan
Edward Heron-Allen and Arthur Earland were among the last great amateur foraminifera researchers. Their partnership began in 1907 and ended in 1932. While close in age to one another, they shared little more than a fascination for forams and a lack of any university training. In most other aspects, the two men were completely different. Heron-Allen was a famous upper class polymath, expert not only
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Life history of Apocarchesium arndti Norf & Foissner, 2010 (Ciliophora, Peritrichia) including recognition of a novel type of zooid Eur. J. Protistol. (IF 2.9) Pub Date : 2023-09-12 Álmos Becz, Júlia Katalin Török
Apocarchesium rosettum and A. arndti were originally discovered in Japan (Lake Biwa) and Germany (River Rhine), respectively. We report the first record of A. arndti in the Danube and provide a detailed description of its colony development. Our findings support the theory of moderate endemicity and reveal a new, smaller zooid type in A. arndti. This zooid remains attached to the colony, connected
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Novel contributions to the molecular and morphological diversity of freshwater monothalamid foraminifera: Description of six new species Eur. J. Protistol. (IF 2.9) Pub Date : 2023-08-24 Ferry Siemensma, Maria Holzmann
Non-marine monothalamous foraminifera are common in freshwater and soil habitats. They comprise a poorly-known group lacking sufficient information about diversity, morphology, reproduction, distribution and ecology. Based on an integrative morphological and molecular approach we describe a new family, a new genus and six new species of freshwater monothalamids from different localities in the Netherlands
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Expansion of the cytochrome C oxidase subunit I database and description of four new lobose testate amoebae species (Amoebozoa; Arcellinida) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-08-13 Giulia M. Ribeiro, Fernando Useros, Kenneth Dumack, Rubén González-Miguéns, Ferry Siemensma, Alfredo L. Porfírio-Sousa, Carmen Soler-Zamora, João Pedro Barbosa Alcino, Daniel J.G. Lahr, Enrique Lara
Arcellinida is ascending in importance in protistology, but description of their diversity still presents multiple challenges. Furthermore, applicable tools for surveillance of these organisms are still in developing stages. Importantly, a good database that sets a correspondence between molecular barcodes and species morphology is lacking. Cytochrome oxidase (COI) has been suggested as the most relevant
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Molecular characterization of methionine aminopeptidase1 from Eimeria tenella Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-29 Ke Xiao, Qiping Zhao, Haixia Wang, Shunhai Zhu, Hui Dong, Bing Huang, Hongyu Han
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Corrigendum to “Morphologic and molecular characterization of Apertospathula pilata n. sp., a novel freshwater spathidiid (Ciliophora Litostomatea) from Idaho USA” [Eur. J. Protistol. 89 (2023) 125990] Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-25 William Bourland
Abstract not available
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Anaerocyclidiidae fam. nov. (Oligohymenophorea, Scuticociliatia): A newly recognized major lineage of anaerobic ciliates hosting prokaryotic symbionts Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-22 Kateřina Poláková, William A. Bourland, Ivan Čepička
The research on anaerobic ciliates, to date, has mainly been focused on representatives of obligately anaerobic classes such as Armophorea or Plagiopylea. In this study, we focus on the anaerobic representatives of the subclass Scuticociliatia, members of the class Oligohymenophorea, which is mainly composed of aerobic ciliates. Until now, only a single anaerobic species, Cyclidium porcatum (here transferred
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Euglena gracilis: Biochemical properties of a membrane bound ecto-phosphatase activity modulated by fluoroaluminate complexes and different trophic conditions Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-20 Anita Leocadio Freitas-Mesquita, Luiz Fernando Carvalho-Kelly, Thaís Souza Silveira Majerowicz, José Roberto Meyer-Fernandes
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Gregarines from darkling beetles of the Atacama Desert, Atacamagregarina paposa gen. et sp. nov. from Scotobius and Xiphocephalus ovatus sp. nov. from Psectrascelis (Coleoptera, Tenebrionidae) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-17 Frank Nitsche, Sarah Carduck, Joshua von Ameln, Niclas Mach, Cristina Dorador, Reinhard Predel, Sonja Rueckert, Hartmut Arndt
Gregarine apicomplexans, a group of single celled organisms, inhabit the extracellular spaces of most invertebrate species. The nature of the gregarine-host interactions is not yet fully resolved, mutualistic, commensal and parasitic life forms have been recorded. In the extreme arid environment of the Atacama Desert, only a few groups of invertebrates hosting gregarines such as darkling beetles (Tenebrionidae)
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Host specificity of passerine Lankesterella (Apicomplexa: Coccidia) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-13 Ashwin Kumar Saravana Bhavan Venkatachalam, Ivan Čepička, Kristýna Hrazdilová, Milena Svobodová
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Ciliates from the intestine of zoo-kept black rhinoceros, with immunofluorescence microscopic and molecular phylogenetic investigation of Rhinozeta rhinozeta (Litostomatea) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-10 Olga A. Kornilova, Maria E. Belokon, Maria A. Skazina, Olga S. Alekseeva, Ludmila V. Chistyakova
The study of endobiotic ciliates from the intestines of various zoo mammals is important for revealing the influence of various factors on endobiont communities. In this paper we describe the species diversity of endobiotic ciliates from the faeces of the eastern black rhinoceros Diceros bicornis michaeli (male and two females, mother and daughter) kept in the zoo. Seven species of the ciliates were
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Enchelyothrix muria n. gen, n. sp., (Ciliophora, Litostomatea, Spathidiida), an extreme halotroph spathidiid from Maharloo Lake, Iran Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-10 Mahnaz Barmshuri, Ondřej Pomahač, William Bourland
Although free-living ciliated protists (Ciliophora) commonly inhabit aquatic and terrestrial biotopes of mild to moderate salinity (PSS-practical salinity scale S = 10–150), very few have adapted to life at more extreme salinities (>150 to saturation). Such extreme halophiles or halotrophs are of interest from the standpoints of evolution, cell physiology, ecology, and even astrobiology. In this work
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Three new species of Gromia (Protista, Rhizaria) identified from the Romanian Black Sea shelf Eur. J. Protistol. (IF 2.9) Pub Date : 2023-07-04 Sylvain Kreuter, Maria Holzmann, Diana Grace Holdsworth, Rozalia Motoc, Ana Bianca Pavel
The protist genus Gromia was first described in 1835 by Dujardin and while gromiids are prominent in the marine environment, Gromia oviformis was, for a long time, the only valid species regularly recorded. To date, 16 species that are morphologically and/or genetically distinct have been described. While recent studies are documenting their diversity and their ecological importance, G. oviformis has
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First redescription and molecular phylogeny of Trimyema claviforme Kahl, 1933 with the description of a Chinese population of Plagiopyla nasuta Stein, 1860 (Ciliophora, Plagiopylea) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-06-26 Ran Li, Wenbao Zhuang, Xiaochen Feng, Hunter N. Hines, Xiaozhong Hu
Ciliates belonging to the class Plagiopylea are obligate anaerobes that are often neglected due to their cryptic lifestyles, difficulty of observation, and overall under-sampling. Here, we investigate two species, namely Trimyema claviforme Kahl, 1933 and Plagiopyla nasuta Stein, 1860, collected in China from marine and freshwater anaerobic sediments, respectively. A complete morphological dataset
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Silica-scaled heterotrophic protists: Rotosphaerida, Thaumatomonadida and Centroplasthelida in Arctic waters of Russia Eur. J. Protistol. (IF 2.9) Pub Date : 2023-06-17 Anna Bessudova, Viktor Gabyshev, Yelena V. Likhoshway
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Identification of the heterotrophic nanoflagellate Bilabrum latius in the southern Adriatic (Mediterranean Sea) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-06-12 Ana Baricevic, Daniela Maric Pfannkuchen, Mirta Smodlaka Tankovic, Mia Knjaz, Ivan Vlasicek, Lana Grizancic, Tjasa Kogovsek, Martin Pfannkuchen
Heterotrophic flagellates (HF) represent an important protist group in marine ecosystem functioning. Characterised by high taxonomic diversity, identification and classification of HF is often difficult using classical methods of light microscopy (LM). Complementing LM with molecular methods, such as barcoding, enables reliable taxonomic identification of even small size nanoflagellates that share
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Holospora-like bacteria “Candidatus Gortzia yakutica” and Preeria caryophila: Ultrastructure, promiscuity, and biogeography of the symbionts Eur. J. Protistol. (IF 2.9) Pub Date : 2023-06-10 Sergei I. Fokin, Natalia A. Lebedeva, Alexey Potekhin, Leandro Gammuto, Giulio Petroni, Valentina Serra
Two already known representatives of Holospora-like bacteria, “Candidatus Gortzia yakutica” from Paramecium putrinum and Preeria caryophila, originally retrieved from the Paramecium aurelia complex, were found in new hosts: Paramecium nephridiatum and Paramecium polycaryum, respectively. In the present study, these bacteria were investigated using morphological and molecular methods. For “Ca. G. yakutica”
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Genome size and GC content of myxomycetes Eur. J. Protistol. (IF 2.9) Pub Date : 2023-06-01 Shu Li, Bao Qi, Xueyan Peng, Wei Wang, Wan Wang, Pu Liu, Bao Liu, Zhanwu Peng, Qi Wang, Yu Li
More than 1272 myxomycetes species have been described, accounting for more than half of all Amoebozoa species. However, the genome size of only three myxomycetes species has been reported. Therefore, we used flow cytometry to present an extensive survey and a phylogeny-based analysis of genome size and GC content evolution in 144 myxomycetes species. The genome size of myxomycetes ranged from 18.7 Mb
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Morphologic and molecular characterization of Apertospathula pilata n. sp., a novel freshwater spathidiid (Ciliophora, Litostomatea) from Idaho, USA Eur. J. Protistol. (IF 2.9) Pub Date : 2023-04-21 William Bourland
Order Spathidiida Foissner and Foissner, 1988 comprises a large group of morphologically diverse, primarily predatory, free living ciliates, the phylogeny of which has remained stubbornly unresolved. Families Arcuospathidiidae and Apertospathulidae are two morphologically similar groups established on the basis of differences in the morphology of the oral bulge and circumoral kinety. While Arcuospathidiidae
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Two new Raabena species and a new Pararaabena species (Ciliophora, Entodiniomorphida) with redescriptions of Raabena bella and Pararaabena dentata Eur. J. Protistol. (IF 2.9) Pub Date : 2023-04-20 Akira Ito
The genera Raabena and Pararaabena (Ciliophora, Entodiniomorphida, Blepharocorythidae) were monospecific, and their type species are Raabena bella Wolska, 1967 and Pararaabena dentata Wolska, 1968. They have been found in Asian elephants and closely resemble each other: ovoid and laterally compressed body; non-retractable adoral ciliary zone; funnel-shaped vestibulum; three non-retractable somatic
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High diversity and isolated distribution of aquatic heterotrophic protists in salars of the Atacama Desert at different salinities Eur. J. Protistol. (IF 2.9) Pub Date : 2023-04-18 Alexandra E. Lennartz (née Rybarski), Frank Nitsche, Alexandra Schoenle, Claudia Voigt, Michael Staubwasser, Hartmut Arndt
The species richness of eukaryotes in the hypersaline environment is generally thought to be low. However, recent studies showed a high degree of phylogenetic novelty at these extreme conditions with variable chemical parameters. These findings call for a more thorough look into the species richness of hypersaline environments. In this study, various hypersaline lakes (salars, 1–348 PSU) as well as
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Single-cell transcriptome reveals cell division-regulated hub genes in the unicellular eukaryote Paramecium Eur. J. Protistol. (IF 2.9) Pub Date : 2023-04-07 Juan Yang, Zhenyuan Wang, Chundi Wang, Danxu Tang, Zihan Zang, Naomi A. Stover, Xiao Chen, Lifang Li
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Testate amoebae response and vegetation composition after plantation removal on a former raised bog Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-30 Angela L. Creevy, David M. Wilkinson, Roxane Andersen, Richard J. Payne
Extensive drainage of peatlands in north-west Europe for the purposes of afforestation for timber production and harvesting has altered the carbon balance and biodiversity value. Large-scale restoration projects aim to reinstate hydrological conditions to keep carbon locked up in the peat and to restart active peat growth. Testate amoebae are an informal grouping of well-studied protists in peatland
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Bacterial communities and toxin profiles of Ostreopsis (Dinophyceae) from the Pacific island of Okinawa, Japan Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-30 Yong Heng Phua, Javier Tejeda, Michael C. Roy, Filip Husnik, Kevin C. Wakeman
Variations in toxicity of the benthic dinoflagellate Ostreopsis Schmidt 1901 have been attributed to specific molecular clades, biogeography of isolated strains, and the associated bacterial community. Here, we attempted to better understand the biodiversity and the basic biology influencing toxin production of Ostreopsis. Nine clonal cultures were established from Okinawa, Japan, and identified using
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Tardigrade stowaways: Literature review of Propyxidium tardigradum (Ciliophora, Peritrichia) and its first record in Scotland Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-22 Karol Wałach, Brian Blagden
Tardigrades are a phylum of microscopic invertebrates with a global distribution. Although our understanding of their systematic position and taxonomy has increased and continues to grow, their relationship with the other organisms that share their habitat remains poorly studied. One such organism is Propyxidium tardigradum, a peritrich ciliate which uses tardigrades for dispersion and as a substrate
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Temperature-dependent resistance to starvation of three contrasting freshwater ciliates Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-16 Thomas Weisse, Ulrike Scheffel, Peter Stadler
We investigated the temperature-dependent response to starvation of three contrasting freshwater ciliates (Ciliophora). The cyst-forming algivorous species Meseres corlissi and the bactivorous species Glaucomides bromelicola, which cannot form cysts, co-occur in the reservoirs (tanks) of tree bromeliads. The mixotrophic species Coleps spetai is common in many lakes. We hypothesized that the ciliates’
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Jirovecia branchilis n. sp. (Microsporidia) from glands of Branchiura sowerbyi (Oligochaeta: Tubificidae) in China Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-13 Xinhua Liu, Shisi Ren, Zhongyuan Chen, Qi Yin, Jianguo Xiang, Jianbo Yu, Deliang Li, Jinyong Zhang
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Siliceous scales in the centrohelid heliozoan Raphidocystis contractilis facilitate settlement to the substratum Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-08 Yumeng Wan, Mikihiko Arikawa, Akane Chihara, Toshinobu Suzaki
The centrohelid heliozoan Raphidocystis contractilis has hundreds of small scales on the surface of the cell body. To understand the biological functions of the scales, comparative examinations were conducted between wild-type and scale-deficient strains that has naturally lost scales after long-term cultivation. The scale-deficient strain exhibited decreased adhesion to the substratum and had a lower
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Morphology, morphogenesis and molecular phylogeny of a novel saline soil ciliate, Urosoma quadrinucleatum n. sp. (Ciliophora, Hypotrichia) Eur. J. Protistol. (IF 2.9) Pub Date : 2023-03-08 Chen Shao, Jing Lyu, Tongxuan Li, Jingyi Wang, Chunyu Lian
The morphology and morphogenesis of a new saline soil hypotrichous ciliate, Urosoma quadrinucleatum n. sp., collected from northwestern China, were studied based on live observations and protargol stained specimens. The new species is characterized as follows: size in vivo 90–130 × 20–30 μm; body outline elongate-elliptical with both ends broadly rounded; four macronuclear nodules; cortical granules
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