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European Journal of Protistology

Chunyu Lian, Tengteng Zhang, Khaled A S Al-Rasheid, Yuhe Yu, Jiamei Jiang, Jie Huang
The living morphology, infraciliature and silverline system of two small Euplotes species, E. wuhanensis sp. n. and E. muscicola Kahl, 1932, isolated from Wuhan, central China, were investigated. Euplotes wuhanensis sp. n. is characterized by a combination of features including small size (40-50 × 25-30 μm), two conspicuously small and eight normal-sized frontoventral cirri, five transverse cirri in two groups, two marginal and two caudal cirri, seven dorsal kineties with about 12 dikinetids in the mid-dorsal row and a double-eurystomus type of dorsal silverline pattern...
October 13, 2018: European Journal of Protistology
Zhao Lyu, Jingbao Li, Erkang Zhu, Chen Shao
The living morphology, infraciliature and morphogenesis of a new urostylid ciliate, Caudiurostyla sinensis gen. nov., spec. nov., isolated from a soil habitat in China, was investigated. The new, monotypic genus is defined by having frontal cirri arranged in a bicorona, distinct transverse cirri, midventral pairs only, buccal cirrus, frontoterminal cirri, multiple marginal cirral rows that replicate independently via within row anlagen formation, more than three dorsal kineties, and caudal cirri. The main morphogenetic features of the new species are: (1) the posterior part of the parental adoral zone is renewed in situ; (2) the marginal cirral rows and dorsal kineties develop intrakinetally; (3) a caudal cirrus is formed at the posterior end of each dorsal kinety; and (4) macronuclear nodules fuse into a single mass during the middle stage...
October 4, 2018: European Journal of Protistology
Andrzej Kaczanowski, Mauryla Kiersnowska
Large extrusion bodies (EBs) in Tetrahymena thermophila were induced by treatment with aphidiocolin (APH), followed by transfer of the cells to a drug free medium. APH induces over-replication of DNA and reversible cell division arrest (Kaczanowski and Kiersnowska, 2011). After treatment the cells were transferred to a drug free medium, and a central granule of chromatin (a prospective EB) surrounded by microtubules developed inside the macronucleus. Subsequently the chromatin of the central granule appeared in the middle region of the dividing macronucleus, and it was later extruded as an EB...
September 27, 2018: European Journal of Protistology
Thomas Weisse
No abstract text is available yet for this article.
September 24, 2018: European Journal of Protistology
Rui Xiao, Xiang Li, Yi Zheng
Thraustochytrium striatum is a fungoid marine protist and was shown to be a promising enzyme producer for potential industrial applications. This research aimed at studying extracellular enzymes secreted by T. striatum under different conditions with specific objectives to qualitatively identify enzymes, quantify the cell growth and enzyme production, correlate enzyme production with extracellular polymeric substances (EPS), and examine the induction of enzyme by polysaccharide substrates. The qualitative analysis showed that T...
September 20, 2018: European Journal of Protistology
Rina Higuchi, Chihong Song, Ryo Hoshina, Toshinobu Suzaki
Chlorella variabilis, a symbiotic alga, is usually present in the cytoplasm of Paramecium bursaria, although it can be cultured in host-free conditions. Morphological and chemical properties of its cell wall were compared between its free-living and symbiotic states. Transmission electron microscopy (quick-freezing and freeze-substitution methods) revealed that the cell wall thickness of symbiotic C. variabilis was reduced to about half that of the free-living one. Chemical properties of the cell wall were examined by treatment with three fluorescent reagents (calcofluor white M2R, FITC-WGA, and FITC-LFA) having specific binding affinities to different polysaccharides...
September 19, 2018: European Journal of Protistology
Pieter R Gurdebeke, Kenneth Neil Mertens, Yoshihito Takano, Aika Yamaguchi, Kara Bogus, Micah Dunthorn, Kazumi Matsuoka, Henk Vrielinck, Stephen Louwye
Species in the genera Hexasterias and Halodinium have been recorded over the last decades as acritarchs in palynological and/or plankton studies. In paleoenvironmental studies, these resting stages are often interpreted as indicators of freshwater input. The biological affinity of these genera has never been definitely established. Here, a new species, Halodinium verrucatum sp. nov., is described and molecular evidence (single specimen SSU and LSU rDNA sequencing) reveals that both this new species and Hexasterias problematica, collected from sediment samples in the Skagerrak and Baltic Sea, are resting stages of prorodontid ciliates...
September 14, 2018: European Journal of Protistology
Magdaléna Kováčiková, Naděžda Vaškovicová, Jana Nebesářová, Andrea Valigurová
Since apicomplexans represent exclusively parasitic unicellular organisms with medical and economic impacts, the principles of their motility have been studied intensively. By contrast, the movement in apicomplexan basal groups, such as gregarines, remains to be elucidated. The present study focuses on Gregarina garnhami parasitising the digestive tract of the locust Schistocerca gregaria, and investigates the involvement of cytoskeletal elements (the ectoplasmic network and myonemes) and the secretion of mucosubstances during eugregarine gliding motility...
August 31, 2018: European Journal of Protistology
Sabine Schiwitza, Hartmut Arndt, Frank Nitsche
With this study we aim to extend the knowledge on the biogeography of craspedid choanoflagellates with additional data from extreme environments. Up to now, very little is known about choanoflagellates from extreme saline environments, as most studies have focused on marine and freshwater habitats. Though previously investigated high saline ice biota communities have indicated a possible adaptation to environments with high salt concentrations. Hypersaline endorheic basins, so-called salt flats or salares from the Atacama Desert in Northern Chile provide an intense environment regarding fluctuating and extreme salinities, which allow for studies on evolutionary adaptations of protists to hypersaline conditions...
August 31, 2018: European Journal of Protistology
Clément Duckert, Quentin Blandenier, Fanny A L Kupferschmid, Anush Kosakyan, Edward A D Mitchell, Enrique Lara, David Singer
Molecular data have considerably contributed to building the taxonomy of protists. Recently, the systematics of Hyalospheniidae (Amoebozoa; Tubulinea; Arcellinida) has been widely revised, with implications extending to ecological, biogeographical and evolutionary investigations. Certain taxa, however, still have an uncertain phylogenetic position, including the common and conspicuous species Nebela militaris. A phylogenetic reconstruction of the Hyalospheniidae using partial sequences of the mitochondrial Cytochrome Oxidase Subunit 1 (COI) gene shows that N...
August 23, 2018: European Journal of Protistology
Lada Hofmannová, Miloslav Jirků, Milada Řeháková, Jana Kvičerová
Philippine tarsier (Tarsius syrichta) is a small nocturnal primate from the Philippines. Little is known about tarsier parasites, including coccidia (Apicomplexa: Eimeriidae), a highly prevalent parasitic protist group in all vertebrate classes. Only 7 valid species of the genus Eimeria, seven species of Isospora and 5 species of Cyclospora have been described in Primates. This study extends the number of coccidia known in primates by two new species obtained from faeces of Philippine tarsiers from Bohol Island...
August 17, 2018: European Journal of Protistology
Julia M Malysh, Yana L Vorontsova, Viktor V Glupov, Alexander A Tsarev, Yuri S Tokarev
An isolate of the microsporidium Vairimorpha ephestiae (originally isolated from Ephestia kühniella) from collection of Prof. J. Weiser was propagated in a laboratory culture of Galleria mellonella. Only disporoblastic sporogony was observed and formation of octospores, characteristic of the genus Vairimorpha, never occurred. A partial nucleotide sequence of the small subunit rRNA gene (1247 bp) for this microsporidium showed 100% identity to the homologous sequences of Vairimorpha (Nosema) necatrix (Genbank accession # U11051 and # DQ996241), a microsporidium with a broad host range within the Lepidoptera...
August 17, 2018: European Journal of Protistology
John R Dolan
The marine oligotrich ciliate Strombidium sulcatum, the best known marine oligotrich of the marine microozoplankton, was first cultured in Villefranche-sur-Mer 35 years ago. Cultures were maintained from 1983 to 2003 and used in 22 studies investigating a very wide variety of questions. Here we review the major findings of these studies and underline their contributions to our knowledge of planktonic ciliate ecology and microbial ecology in general. We conclude with the observation that while ecophysiology has apparently fallen out of fashion, culture work will likely return as an invaluable resource in our present 'omics' era...
August 15, 2018: European Journal of Protistology
Tengyue Zhang, Hongli Qi, Tengteng Zhang, Yalan Sheng, Alan Warren, Chen Shao
The morphology, morphogenesis and small subunit (SSU) rRNA gene-based phylogeny of Neourostylopsis flava paraflava nov. subsp. were investigated. Neourostylopsis flava paraflava nov. subsp. was separated from N. flava flava nov. stat. by habitat (brackish water vs. fresh water), pretransverse cirri (absent in all specimens vs. present in 15% of specimens), the numbers of frontal cirri (8-15 vs. 6-8) and left marginal cirral rows (6-9 vs. 4-5). The main morphogenetic features of N. flava paraflava nov. subsp...
August 2, 2018: European Journal of Protistology
Akira Ito, Winnie Eckardt, Tara S Stoinski, Thomas R Gillespie, Toshihiro Tokiwa
Four new species, Troglodytella gracilis, T. virunga, T. dolium, and Gorilloflasca longior were described from the mountain gorillas in Rwanda. The three Troglodytella species share a retractable adoral ciliary zone, four non-retractable ciliary arches, two broad skeletal plates, a skeletal rod plate, numerous longitudinal cortical grooves, and four contractile vacuoles. The anterior ciliary arch is the longest of the four arches, extending transversely on the left body surface. T. gracilis and T. virunga are characterized by an elongated body, a tail flap, and a wedge-shaped macronucleus...
August 2018: European Journal of Protistology
Zhaocui Meng, Kuidong Xu, Renhai Dai, Alan Warren
The diversity of marine benthic ciliates is largely known from the intertidal zone. No comparative data are available for the change of ciliate communities from the intertidal to offshore sediments in the Yellow Sea. We investigated the community composition and diversity of benthic ciliates at two intertidal (sandy and silty-sand) stations and eight offshore stations along a latitudinal transect in the Yellow Sea. The ciliate abundance and biomass decreased almost linearly with increasing water depth and distance from the intertidal zone...
August 2018: European Journal of Protistology
Xiangrui Chen, Shahed Uddin Ahmed Shazib, Ji Hye Kim, Min Seok Kim, Mann Kyoon Shin
Gruberia Kahl, 1932 is a species-poor genus comprising only seven named species. Most of these species have not been reinvestigated since the original reports. In the present work, we investigated the taxonomy and phylogeny of Gruberia lanceolata (Gruber, 1884) Kahl, 1932 based on analyses of morphology and multiple gene sequences from four South Korean populations. This species is mainly characterized by a well-developed peristome region, segmented paroral membrane, and moniliform macronucleus. Some morphological features were not stable among the four populations investigated, such as body shape and size, cell color, and the ratio of oral length to body length...
August 2018: European Journal of Protistology
Lingyun Chen, Weining Wu, Hamed A El-Serehy, Xiaozhong Hu, John C Clamp
A distinct population of Anteholosticha intermedia was isolated from soil in the Great Smoky Mountains of North Carolina, USA, and its morphology, morphogenesis and molecular phylogeny investigated by microscopic observations of live and protargol-prepared specimens and analyses of the sequence of small subunit (SSU) rDNA. Our population closely resembles the populations from Austria and Korea. Members of the genus Anteholosticha have been regarded as ontogenetically diverse, which is confirmed by the present work...
August 2018: European Journal of Protistology
H Zhang, M Väliranta, M J Amesbury, D J Charman, A Laine, E-S Tuittila
It is well established that in ombrotrophic bogs, water-table depth (WTD) is the primary environmental control on testate amoeba distribution. However, the environmental controls on testate amoebae in minerotrophic fens are less well known and successional change in their assemblages associated with fen-bog peatland development has been scarcely investigated. Here we investigate a peatland space-for-time sequence resulting from postglacial rebound on the west coast of Finland, to assess successional patterns in testate amoeba communities and their relationships with environmental variables during peatland development...
July 24, 2018: European Journal of Protistology
Daniele Corsaro, Danielle Venditti
Various strains belonging to three Acanthamoeba species, A. griffini (genotype T3), A. lenticulata (T5), and A. jacobsi (T15), have group I introns in their 18S rRNA genes. Group I introns are self-splicing ribozymes that can spread among host lineages either through an intron-encoded endonuclease at the DNA level, or by reverse splicing during the RNA cycle. In Acanthamoeba, introns belong to the subclass IC1, they are located at one out four positions within the rRNA, show low identity values and all lack open reading frames to encode for an endonuclease...
July 18, 2018: European Journal of Protistology
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