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European Journal of Protistology

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https://www.readbyqxmd.com/read/28807560/morphologic-and-molecular-characterization-of-seven-species-of-the-remarkably-diverse-and-widely-distributed-metopid-genus-urostomides-jankowski-1964-armophorea-ciliophora
#1
William Bourland, Johana Rotterová, Ivan Čepička
The free-living ciliates of the order Metopida Jankowski, 1980 are pivotal players in the microbial food web of the sulfuretum, acting as hosts to prokaryotic endo- and ectosymbionts. They are also of interest in the study of the function and evolution of their mitochondrion-related organelle, the hydrogenosome. The taxonomy and phylogeny of this group remains confused, due, in large part, to the fact that most of its taxa have not been characterized by modern methods including molecular sequencing. In this report we provide morphologic and molecular characterization of seven taxa from the poorly-known resurrected genus Urostomides obtained in the course of broad geographic sampling...
July 20, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28802879/quadrulella-texcalense-sp-nov-from-a-mexican-desert-an-unexpected-new-environment-for-hyalospheniid-testate-amoebae
#2
Horacio Pérez-Juárez, Angélica Serrano-Vázquez, Anush Kosakyan, Edward A D Mitchell, Víctor M Rivera Aguilar, Daniel J G Lahr, Mayra M Hernández Moreno, Humberto Macías Cuellar, Luis E Eguiarte, Enrique Lara
Quadrulella (Amoebozoa, Arcellinida, Hyalospheniidae) is a genus of testate amoebae with unmistakable morphology, which secretes characteristic square plates to reinforce the test. They are mainly known from fens and freshwater habitats and have never been documented in deserts. We describe a new species, Quadrulella texcalense, from biological soil crusts in the intertropical desert of Tehuacán (state of Puebla, Mexico). Quadrulella texcalense occurred only at altitudes between 2140 and 2221m.a.s.l., together with the bryophyte genera Pseudocrossidium, Weissia, Bryum, Didymodon, Neohyophyla and Aloina...
July 17, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28781096/morphology-morphogenesis-and-molecular-phylogeny-of-a-new-soil-ciliate-paragonostomoides-xianicum-n-sp-ciliophora-hypotrichia-gonostomatidae
#3
Jingyi Wang, Jiyang Ma, Shuyan Qi, Chen Shao
A hypotrichous ciliate, Paragonostomoides xianicum n. sp., was discovered in soil on the surface of the Xi'an Circumvallation, Xi'an, China. Its morphology and some major ontogenetic stages were studied and the phylogenetic position was estimated using standard methods Paragonostomoides xianicum n. sp. is characterized as follows: body size about 75-90×15-25μm in vivo, elliptical and flexible; colourless mitochondrion-like cortical granules scattered throughout cell surface, about 0.8×0.6μm in size; contractile vacuole positioned at mid-body; frontoventral row IV extends beyond buccal vertex and frontoventral row VI extends to about body end; frontoventral cirri not in pairs; transverse cirri absent; three caudal cirri; two macronuclear nodules and one to four micronuclei...
July 12, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28778555/redescription-and-phylogenetic-analyses-of-durchoniella-spp-ciliophora-astomatida-associated-with-the-polychaete-cirriformia-tentaculata-montagu-1808
#4
Anne-Laure Sauvadet, Denis H Lynn, Erwan G Roussel, Sophie Le Panse, Estelle Bigeard, Joseph Schrével, Laure Guillou
Microscopic and phylogenetic analyses were performed on endocommensal astome ciliates retrieved from the middle intestine of a marine cirratulid polychaete, Cirriformia tentaculata, collected in the bay of Roscoff (English Channel, Northwest French coast) and on the Southwest English coast. Three morphotypes of the astome genus Durchoniella were identified, two corresponding to described species (the type species Durchoniella brasili (Léger and Duboscq, 1904) De Puytorac, 1954 and Durchoniella legeriduboscqui De Puytorac, 1954) while a third morphotype remains undescribed...
July 11, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28778556/preface-to-the-special-issue
#5
EDITORIAL
John Clamp, Weibo Song, Chris Lobban, Denis Lynn
No abstract text is available yet for this article.
July 6, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28756938/isolation-and-molecular-characterization-of-acanthamoeba-from-patients-with-keratitis-in-spain
#6
T Martín-Pérez, A Criado-Fornelio, J Martínez, M A Blanco, I Fuentes, J Pérez-Serrano
In order to improve our knowledge on the epidemiology of amoebic keratitis, as well as the identification of Acanthamoeba isolates, we have isolated Acanthamoeba spp. from five symptomatic patients in Spain in the present study. All isolates were grown in axenic liquid medium, with only one exception. The morphology of these isolates were characterized by optical and scanning electron microscopy. Their structural features corresponded to those of amphizoic amoebae (namely Acanthamoeba spp.). The molecular characterization of the five Acanthamoeba isolates yielded six sequences...
July 4, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28778557/morphology-and-molecular-phylogeny-of-three-heterotrichid-species-ciliophora-heterotrichea-including-a-new-species-of-anigsteinia
#7
Xiangrui Chen, Ji Hye Kim, Shahed Uddin Ahmed Shazib, Choon Bong Kwon, Mann Kyoon Shin
Heterotrichs are generally larger than ciliates of other groups with a seemingly cosmopolitan distribution, and recent studies have demonstrated that they exhibit great biodiversity. In the present work, we investigated the morphology and small subunit rRNA (SSU rRNA) gene sequences of three heterotrichous species, including that of a new one, Anigsteinia paraclarissima spec. nov. The new organism is morphologically very similar to A. clarissima, however, it can be distinguished from the latter by the larger dimensions and more somatic kineties (25-32 vs...
July 1, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28735853/a-comparative-study-of-genome-organization-and-epigenetic-mechanisms-in-model-ciliates-with-an-emphasis-on-tetrahymena-paramecium-and-oxytricha
#8
REVIEW
Yurui Wang, Yuanyuan Wang, Yalan Sheng, Jie Huang, Xiao Chen, Khaled A S Al-Rasheid, Shan Gao
As a group of unicellular eukaryotes, ciliates offer a unique system to explore epigenetic regulation, mostly due to their nuclear dualism. Ciliates launched a successful radiation after their early evolutionary branching, therefore harboring an unexpectedly rich pool of diverse biological functions and mechanisms. In this review, we compare distinct features of different ciliates in mating type determination, genome organization, DNA methylation, and removal of internal eliminated sequences (IES), with emphasis on Tetrahymena, Paramecium and Oxytricha...
July 1, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28756937/short-pulse-neodymium-yttrium-aluminium-garnet-nd-yag-1064nm-laser-irradiation-photobiomodulates-mitochondria-activity-and-cellular-multiplication-of-paramecium-primaurelia-protozoa
#9
Andrea Amaroli, Alberico Benedicenti, Silvia Ravera, Steven Parker, Wayne Selting, Isabella Panfoli, Stefano Benedicenti
Few studies exist to explore the potential photobiomodulation (PBM) effect of neodymium:yttrium-aluminium garnet (Nd:YAG) laser irradiation using a flat-top handpiece delivery system. In this study, we explored the photobiomodulation effect of that laser, on Paramecium primaurelia. The parameters for the different study groups were: 0.50W, 10Hz, 100msp, 30J/cm(2); 0.75W, 10Hz, 100msp, 45J/cm(2); 1.00W, 10Hz, 100msp, 60J/cm(2); 1.25W, 10Hz, 100msp, 75J/cm(2) and 1.50W, 10Hz, 100msp, 90J/cm(2). Our results suggest that only the parameter 0...
June 19, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28662495/rhogostomidae-cercozoa-from-soils-roots-and-plant-leaves-arabidopsis-thaliana-description-of-rhogostoma-epiphylla-sp-nov-and-r-cylindrica-sp-nov
#10
Kenneth Dumack, Sebastian Flues, Karoline Hermanns, Michael Bonkowski
Cercozoa are a highly diverse protist phylum in soils and in the phyllosphere of plants. Many families are still poorly described and the vast majority of species are still unknown. Although testate amoebae are among the better-studied protists, only little quantitative information exists on the morphology, phylogeny and ecology of cercozoan Rhogostomidae. We cultured four different strains of Rhogostoma spp. isolated from Arabidopsis leaves, agricultural soil and rhizosphere soil of Ocimum basilicum and Nicotiana sp...
June 13, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28662494/gorilloflasca-africana-n-g-n-sp-entodiniomorphida-from-wild-habituated-virunga-mountain-gorillas-gorilla-beringei-beringei-in-rwanda
#11
Akira Ito, Winnie Eckardt, Tara S Stoinski, Thomas R Gillespie, Toshihiro Tokiwa
A new entodiniomorphid ciliate species, Gorilloflasca africana n. g., n. sp. was described from the Virunga mountain gorillas, Gorilla beringei beringei, in Rwanda. It is characterized by a flask-shaped body, a long tubular vestibulum, a round frontal lobe, a large posterior cavity, an ellipsoidal or peanut-shaped macronucleus and a single contractile vacuole. G. africana has the adoral and the vestibular ciliary zones in the buccal area. The adoral ciliary zone is non-retractable, encircling the vestibular opening...
June 13, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28675820/grazing-of-nuclearia-thermophila-and-nuclearia-delicatula-nucleariidae-opisthokonta-on-the-toxic-cyanobacterium-planktothrix-rubescens
#12
Sebastian Dirren, Gianna Pitsch, Marisa O D Silva, Thomas Posch
During the last decades, the planktonic cyanobacterium Planktothrix rubescens became a dominant primary producer in many deep pre-alpine lakes. While altered physiochemical conditions due to lake warming seem to favour this cyanobacterial species, its dominance is partly attributed to factors conferring grazing resistance. The rigid structure of the cyanobacterial filaments and toxic secondary metabolites (e.g. microcystins) protect against diverse grazers. Nonetheless, species of the protistan genus Nuclearia (Nucleariidae, Opisthokonta) are able to overcome this grazing protection...
June 8, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28662491/first-freshwater-member-ever-reported-for-the-family-bathycoccaceae-chlorophyta-archaeplastida-from-argentinean-patagonia-revealed-by-environmental-dna-survey
#13
Enrique Lara, Leonardo D Fernández, M Romina Schiaffino, Irina Izaguirre
We characterized molecularly the first freshwater member ever reported for the family Bathycoccaceae in Lake Musters (Argentinean Patagonia). Members of this family are extremely numerous and play a key ecological role in marine systems as primary producers. We cloned a fragment comprising the SSU rRNA gene+ITS region from environmental DNA using specific mamiellophyte primers. The unique SSU rRNA gene sequence obtained clustered robustly with Bathycoccus prasinos. Analysis of the two-dimensional structure of the ITS region showed the presence of a typical supplementary helix in the ITS-2 region, a synapomorphy of Bathycoccaceae, which confirmed further its phylogenetic placement...
June 8, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28662493/gregarines-apicomplexa-gregarinasina-in-psocids-insecta-psocoptera-including-a-new-species-description-and-their-potential-use-as-pest-control-agents
#14
Sonja Rueckert, Dušan Devetak
Gregarine apicomplexans are unicellular organisms that infect invertebrate hosts in marine, freshwater and terrestrial habitats. The largest group of invertebrates infested on land is the insects. The insect order Psocoptera (booklice) has recently gained wider interest due to specimens occurring in stored food products and therefore being considered pest organisms. Biological control agents are often used to eliminate pest organisms. In this study we examined the psocid Dorypteryx domestica, an invasive psocid species that is spreading all over the world...
May 31, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28609684/taxonomic-revision-of-freshwater-foraminifera-with-the-description-of-two-new-agglutinated-species-and-genera
#15
Ferry Siemensma, Laure Apothéloz-Perret-Gentil, Maria Holzmann, Steffen Clauss, Eckhard Völcker, Jan Pawlowski
Most foraminifera inhabit marine habitats, but some species of monothalamids have been described from freshwater environments, mainly from Swiss water bodies over 100 years ago. Recent environmental DNA surveys revealed the presence of four major phylogenetic clades of freshwater foraminifera. However, until now only one of them (clade 2) has been associated to a morphologically described taxon-the family Reticulomyxidae. Here, we present morphological and molecular data for the genera representing the three remaining clades...
May 31, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28673471/unusual-features-of-non-dividing-somatic-macronuclei-in-the-ciliate-class-karyorelictea
#16
REVIEW
Ying Yan, Anna J Rogers, Feng Gao, Laura A Katz
Genome structure and nuclear organization have been intensely studied in model ciliates such as Tetrahymena and Paramecium, yet few studies have focused on nuclear features of other ciliate clades including the class Karyorelictea. In most ciliates, both the somatic macronuclei and germline micronuclei divide during cell division and macronuclear development only occurs after conjugation. However, the macronuclei of Karyorelictea are non-dividing (i.e. Div-) and develop anew from micronuclei during each asexual division...
May 22, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28521174/high-degree-of-specificity-in-the-association-between-symbiotic-betaproteobacteria-and-the-host-euplotes-ciliophora-euplotia
#17
Claudia Vannini, Cristiana Sigona, Martin Hahn, Giulio Petroni, Masahiro Fujishima
The Betaproteobacteria-Euplotes association is an obligatory symbiotic system involving a monophyletic group of ciliate species and two betaproteobacteria species which can be alternatively present. Recent data showed that this relationship has been established more than once and that several symbiont-substitution events took place, revealing a complex and intriguing evolutionary path. Due to the different evolutionary pathways followed by the different symbionts, each bacterial strain could have differentially evolved and/or lost functional traits...
June 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28486163/morphology-morphogenesis-and-molecular-phylogeny-of-pleurotricha-oligocirrata-nov-spec-ciliophora-spirotrichea-stylonychinae
#18
Mi-Hyun Park, Ji Hye Moon, Ki Nam Kim, Jae-Ho Jung
Pleurotricha oligocirrata nov. spec. was discovered in samples collected from a freshwater wetland in Korea and is described here based on its morphology, morphogenesis, and the nucleotide sequence of its nuclear small subunit ribosomal rRNA (SSU rRNA) gene. In its genus, P. oligocirrata is the only species that possesses one right marginal cirral row. The morphology of P. oligocirrata is as follows: body size 98-148×47-72μm in protargol preparations, colourless and rigid body; contractile vacuole anterior of mid-body near left margin; cortical granules lacking; two macronuclear nodules with two micronuclei; undulating membranes in Oxytricha pattern; 50-62 adoral membranelles, 23-27 frontal-ventral-transverse cirri, one left and one right marginal cirral row; six or seven dorsal kineties, including dorsomarginal rows, with three caudal cirri...
June 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28482327/first-description-of-cryptosporidium-ubiquitum-xiia-subtype-family-in-farmed-fur-animals
#19
Klára Kellnerová, Nikola Holubová, Anna Jandová, Antonín Vejčík, John McEvoy, Bohumil Sak, Martin Kváč
This study investigated the prevalence of Cryptosporidium in farmed fur animals in the Czech Republic and Poland. A total of 480 faecal samples were collected from fur animals, including 300 American mink (Mustela vison), 60 silver foxes (Vulpes vulpes), 50 long-tailed chinchillas (Chinchilla lanigera), and 70 nutrias (Myocastor coypus), at 14 farms. Samples were examined for the presence of Cryptosporidium using microscopy (following aniline-carbol-methyl violet staining) and sequence analysis of PCR amplified products...
June 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28478287/morphology-morphogenesis-and-molecular-phylogeny-of-uroleptus-caudiholosticha-stueberi-foissner-1987-comb-nov-ciliophora-hypotricha-and-reclassification-of-the-remaining-caudiholosticha-species
#20
Fengchao Li, Zhao Lyu, Yanbo Li, Xinpeng Fan, Saleh A Al-Farraj, Chen Shao, Helmut Berger
The morphology, morphogenesis, and SSU rDNA sequence of a Caudiholosticha stueberi population from Southwest China soil were analyzed. The studies confirm the assumption of previous workers that this species has dorsomarginal kineties and thus does not belong to the urostyloids, but to the non-oxytrichid dorsomarginalian genus Uroleptus whose members have, in contrast to C. stueberi, a distinct tail. On the basis of two morphological features we split Uroleptus into three subgenera: U. (Uroleptus) (tail present; more than five transverse cirri; habitat freshwater), U...
June 2017: European Journal of Protistology
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