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European Journal of Protistology

Tomáš Tyml, Iva Dyková
Morphological and molecular characterizations of three newly isolated tubulinean strains and re-examination of five strains formerly considered representatives of Saccamoeba and one strain formerly considered as Trichamoeba resulted in (a) the determination of strain BA02, isolated from a dripping rock ledge in Skansbukta (Billefjorden, Svalbard), as a new representative of Ptolemeba bulliensis Brown et al., 2014; (b) identification of strain ATCC(®) 50249™, deposited in the American Type Culture Collection as Trichamoeba, as the same species (P...
August 26, 2017: European Journal of Protistology
Song Li, William A Bourland, Saleh A Al-Farraj, Lifang Li, Xiaozhong Hu
Most species in the anaerobic ciliate family Caenomorphidae Poche, 1913 lack detailed descriptions based on modern morphologic and molecular methods. In this report, two species, Caenomorpha medusula Perty, 1852 and Sulfonecta uniserialis (Levander, 1894) Jankowski, 1978, were isolated from freshwater anaerobic sediments in Qingdao, China. Another population of C. medusula was recorded from Boise, Idaho, USA. We reinvestigated live morphology, ciliature, and the small-subunit (SSU) rRNA gene sequence of both species...
August 10, 2017: European Journal of Protistology
Jiří Vávra, Miroslav Hyliš, Ivan Fiala, Veronika Sacherová, Charles R Vossbrinck
Structural, molecular and life cycle data are presented for two microsporidian species of the genus Berwaldia: B. singularis Larsson, 1981 (type species of the genus) and B. schaefernai Vávra and Larsson, 1994, parasites of Daphnia pulex Leydig, 1860 and Daphnia galeata Sars, 1863, respectively. Analysis of the SSU rDNA gene confirmed the species status of both species and showed that the GenBank sequence data submitted previously in GenBank for the genus Berwaldia, are from microsporidia that are not Berwaldia...
August 3, 2017: European Journal of Protistology
Hongbo Pan, Thorsten Stoeck
We collected a heterotrich ciliate from hypersaline waters on the Cape Verde island Sal. After living observation and protargol-staining, it closely matched Blepharisma halophilum Ruinen, 1938. However, because (i) Ruinen most likely described several different species as B. halophilum, and (ii) he provided only very scarce diagnostic features, we redescribe this species with state-of-the-art methods according to modern standards. This will facilitate an accurate identification of this ciliate species, globally distributed in hypersaline water bodies: halophile Blepharisma, about 100-250μm in vivo; 32-42 adoral membranelles; 13-17 somatic kineties, including 2-4 anterior kinety fragments; single elongated macronucleus; cortical granules colourless...
July 24, 2017: European Journal of Protistology
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
Moses Chemurot, Lina De Smet, Marleen Brunain, Riet De Rycke, Dirk C de Graaf
The microsporidium Nosema neumanni n. sp., a new parasite of the honeybee Apis mellifera is described based on its ultra-structural and molecular characteristics. Structures resembling microsporidian spores were found by microscopic examination of honeybees from Uganda. Molecular confirmation failed when PCR primers specific for Nosema apis and Nosema ceranae were used, but was successful with primers covering the whole family of Nosematidae. We performed transmission electron microscopy and found typical microsporidian spores which were smaller (length: 2...
July 19, 2017: European Journal of Protistology
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
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
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
John Clamp, Weibo Song, Chris Lobban, Denis Lynn
No abstract text is available yet for this article.
July 6, 2017: European Journal of Protistology
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
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
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
Kyung-Min Park, Namyi Chae, Jae-Ho Jung, Gi-Sik Min, Sanghee Kim, Helmut Berger
The morphology of Keronopsis helluo Penard, 1922, type species of Keronopsis, and Paraholosticha pannonica Gellért and Tamás, 1959, two little-known members of the Keronopsidae Jankowski, 1979, was described using standard methods. In addition, we sequenced the SSU rRNA of both species. Keronopsis helluo was isolated from a mossy soil from Robert Island (Antarctica) while P. pannonica was found in terrestrial moss from Alaska. Our data correspond very well with the original descriptions. The frontal ciliature of K...
August 2017: European Journal of Protistology
Helen M Roe, Suzanne M Elliott, R Timothy Patterson
Testate amoeba-derived transfer functions are frequently used in peatland palaeohydrological studies and involve the development of training sets from surficial peats. However, within acrotelmic peats, considerable vertical variation in assemblage composition can occur, particularly along Sphagnum stems, which may limit the representation of the associated 'contemporary' testate amoeba samples as analogues for the peatland surface. This paper presents contiguous testate amoeba assemblage data from nine monoliths collected from different peatland microforms (hummock, hollow, lawn) in three Sphagnum dominated ombrotrophic peatlands in Ontario and Quebec, eastern Canada...
August 2017: European Journal of Protistology
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...
August 2017: European Journal of Protistology
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...
August 2017: European Journal of Protistology
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...
August 2017: European Journal of Protistology
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...
August 2017: European Journal of Protistology
Zhe Wang, Tong Zhou, Zemao Gu
Trichodinids are ciliated protozoan parasites or symbionts of marine and freshwater organisms. During a parasitic ciliate survey in Hubei, China, two Trichodina species, T. acutaLom, 1961 and T. hyperparasitis Chen & Hsish, 1984, were isolated from body surface of loach Misgurnus anguillicaudatus and gills of yellow catfish Pelteobagrus fulvidraco, respectively. The two species were investigated morphologically, based on silver-strained specimens, and their small subunit ribosomal RNA gene (SSU rDNA) sequences were sequenced...
August 2017: European Journal of Protistology
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