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European Journal of Protistology

Andernice Zanetti, Robson C Ferreira, Myrna G Serrano, Carmen S A Takata, Marta Campaner, Marcia Attias, Wanderley de Souza, Marta M G Teixeira, Erney P Camargo
The genus Phytomonas includes trypanosomatids transmitted to the fruits, latex, and phloem of vascular plants by hemipterans. We inferred the phylogenetic relationships of plant and insect isolates assigned to the previously defined genetic groups A-F and H of Phytomonas, particularly those from groups A, C and E comprising flagellates of Solanaceae fruits. Phylogenetic analyses using glycosomal Glyceraldehyde Phosphate Dehydrogenase (gGAPDH) and Small Subunit rRNA (SSU rRNA) genes strongly supported the monophyly of the genus Phytomonas and its division into seven main infrageneric phylogenetic lineages (Phy clades)...
September 30, 2016: European Journal of Protistology
Santosh Kumar, Daizy Bharti, Pablo Quintela-Alonso, Mann Kyoon Shin, Antonietta La Terza
The morphology and morphogenesis of two stylonychid ciliates, Stylonychia ammermanniGupta et al., 2001 and Tetmemena bifaria (Stokes, 1887) Berger, 2001, isolated from soil samples of Lombardia region, Northern Italy, and water samples from Cheonggancheon stream, South Korea, were investigated. The Italian population of S. ammermanni was found to be very similar in morphology to the Indian type population and the junior synonym S. harbinensisShi and Ammermann, 2004 since most of the morphometric data overlapped...
September 23, 2016: European Journal of Protistology
Jingyi Dong, Xiaoteng Lu, Chen Shao, Jie Huang, Khaled A S Al-Rasheid
The morphology and morphogenesis of a new saline soil hypotrich, Lamtostyla salina n. sp., collected from Longfeng Wetland in Daqing, north China, were studied based on live observations and protargol stained specimens. The new species is characterized as follows: body very flexible but not contractile, lanceolate with anterior end broadly rounded, widest at about 1/3 of body length, posterior end narrowly rounded; cortical granules colourless and scattered; amphisiellid median cirral row ends ahead of mid-body, composed of 5-13 cirri; 4-20 frontoventral cirri arranged in 2-4 rows; three frontal, one buccal and 2-6 transverse cirri; usually one left and one right marginal row, composed of 17-51 and 20-51 cirri respectively; usually two dorsal kineties; two macronuclear nodules and two micronuclei...
September 20, 2016: European Journal of Protistology
Thomas Cavalier-Smith
Discoveries of numerous new taxa and advances in ultrastructure and sequence phylogeny (including here the first site-heterogeneous 18S rDNA trees) require major improvements to euglenozoan higher-level taxonomy. I therefore divide Euglenozoa into three subphyla of substantially different body plans: Euglenoida with pellicular strips; anaerobic Postgaardia (class Postgaardea) dependent on surface bacteria and with uniquely modified feeding apparatuses; and new subphylum Glycomonada characterised by glycosomes (Kinetoplastea, Diplonemea)...
September 15, 2016: European Journal of Protistology
Mariia Berdieva, Dmitry Bogolyubov, Yuliya Podlipaeva, Andrew Goodkov
The presence, spatial distribution and forms of intranuclear and nucleus-associated cytoplasmic actin were studied in Amoeba proteus with immunocytochemical approaches. Labeling with different anti-actin antibodies and staining with TRITC-phalloidin and fluorescent deoxyribonuclease I were used. We showed that actin is abundant within the nucleus as well as in the cytoplasm of A. proteus cells. According to DNase I experiments, the predominant form of intranuclear actin is G-actin which is associated with chromatin strands...
September 9, 2016: European Journal of Protistology
Manfred Wanner, Barbara Seidl-Lampa, Axel Höhn, Daniel Puppe, Ralf Meisterfeld, Michael Sommer
Testate amoebae with self-secreted siliceous shell platelets ("idiosomes") play an important role in terrestrial silicon (Si) cycles. In this context, Si-dependent culture growth dynamics of idiosomic testate amoebae are of interest. Clonal cultures of idiosomic testate amoebae were analyzed under three different Si concentrations: low (50μmolL(-1)), moderate/site-specific (150μmolL(-1)) and high Si supply (500μmolL(-1)). Food (Saccharomyces cerevisiae) was provided in surplus. (i) Shell size of four different clones of idiosomic testate amoebae either decreased (Trinema galeata, Euglypha filifera cf...
September 8, 2016: European Journal of Protistology
Edward Mitchell
No abstract text is available yet for this article.
September 2016: European Journal of Protistology
Rodrigo Leite Arrieira, Leilane Talita Fatoreto Schwind, Ciro Yoshio Joko, Geziele Mucio Alves, Luiz Felipe Machado Velho, Fábio Amodêo Lansac-Tôha
Planktonic testate amoebae in floodplains exhibit a broad-range of morphological variability. The variation size is already known, but it is necessary to know how this is for morphological variables. This study aimed to identify the relationships between testate amoebae morphology and environmental factors in four neotropical floodplains. We conducted detailed morphometric analyses on 27 common species of planktonic testate amoebae from genera Arcella, Centropyxis, Cucurbitella, Suiadifflugia, Difflugia, Lesquereusia and Netzelia...
August 31, 2016: European Journal of Protistology
Thomas Cavalier-Smith, Ema E Chao, Keith Vickerman
We describe three new phagotrophic euglenoid species by light microscopy and 18S rDNA and Hsp90 sequencing: Scytomonas saepesedens; Decastava edaphica; Entosiphon oblongum. We studied Scytomonas and Decastava ultrastructure. Scytomonas saepesedens feeds when sessile with actively beating cilium, and has five pellicular strips with flush joints and Calycimonas-like microtubule-supported cytopharynx. Decastava, sister to Keelungia forming new clade Decastavida on 18S rDNA trees, has 10 broad strips with cusp-like joints, not bifurcate ridges like Ploeotia and Serpenomonas (phylogenetically and cytologically distinct genera), and Serpenomonas-like feeding apparatus (8-9 unreinforced microtubule pairs loop from dorsal jaw support to cytostome)...
August 28, 2016: European Journal of Protistology
Tomáš Tyml, Kateřina Skulinová, Jan Kavan, Oleg Ditrich, Martin Kostka, Iva Dyková
The diversity of heterolobosean amoebae, important members of soil, marine and freshwater microeukaryote communities in the temperate zones, is greatly under-explored in high latitudes. To address this imbalance, we studied the diversity of this group of free-living amoebae in the Arctic and the Antarctic using culture dependent methods. Eighteen strain representatives of three heterolobosean genera, Allovahlkampfia Walochnik et Mulec, 2009 (1 strain), Vahlkampfia Chatton et Lalung-Bonnaier, 1912 (2) and Naegleria Alexeieff, 1912 (15) were isolated from 179 samples of wet soil and fresh water with sediments collected in 6 localities...
August 28, 2016: European Journal of Protistology
Hongbo Pan, Liqing Wang, Jiamei Jiang, Thorsten Stoeck
The morphology of four cyrtophorian ciliates, Dysteria ovalis, D. semilunaris, Phascolodon vorticella, and Chlamydonellopsis calkinsi, were investigated using living observation and protargol-staining. The morphology of D. ovalis is revealed in detail for the first time, and it is characterized by the following combination of features: size 40-50×20-30μm in vivo; oval in outline; four right kineties, including two frontoventral kineties and one shortened leftmost right kinety; three left frontal kineties; two ventrally located contractile vacuoles; marine habitat...
August 25, 2016: European Journal of Protistology
Daizy Bharti, Santosh Kumar, Antonietta La Terza
The morphology of Rigidosticha italiensis n. gen., n. sp., which was found in a soil sample collected from an uncultivated field in Lombardia, Italy, was investigated using live observation and protargol staining. Rigidosticha n. gen. is characterised by a rigid body, undulating membranes resembling a Steinia pattern, oxytrichid frontal ciliature, distinct mid-ventral cirral pairs, transverse cirri, one right and one left row of marginal cirri, absence of dorsal kinety 3 fragmentation, more than two dorsomarginal rows, and caudal cirri...
August 25, 2016: European Journal of Protistology
Vasily V Zlatogursky, Alexander Kudryavtsev, Ilya A Udalov, Natalya Bondarenko, Jan Pawlowski, Alexey Smirnov
Amoebae of the genus Korotnevella are covered with scales, the structure of which is believed to be species-specific and allows distinguishing species reliably at the morphological level. We studied members of this genus in order to assess the genetic structure of the local populations of amoebae. For the present study we isolated nine freshwater strains of Korotnevella, belonging to three species, from two locations in North-Western Russia. In order to obtain data on the population structure of these amoebae, we identified all isolates based on the light-microscopic morphology and scale structure and investigated both inter-strain and intra-strain polymorphism of Cox I and 18S rRNA genes...
August 10, 2016: European Journal of Protistology
Zedong Wang, Shuchao Wang, Wei Wang, Yi Gu, Huanhuan Liu, Feng Wei, Quan Liu
Toxoplasma gondii, the causative agent of toxoplasmosis, encodes two casein kinase 1 (CK1) isoforms, CK1α and CK1β, with only CK1α having enzyme activity. Here we investigated the biological role of CK1α by construction of a CK1α deletion mutant (Δck1α) based on the type I parasite, and complement the mutant with restored expression of CK1α. Deletion of CK1α resulted in markedly defective parasite replication in vitro. Infected mice with Δck1α parasite caused suppression of IL-12 production, severe liver damage, higher tissue burdens, and short survival time relative to the CK1α-positive parental strain...
August 4, 2016: European Journal of Protistology
Jingyi Wang, Zhao Lyu, Alan Warren, Feng Wang, Chen Shao
The living morphology, infraciliature and morphogenesis of a new ciliate, Urosomoida paragiliformis n. sp., collected from saline soil in Weinan, China, were studied in vivo and after protargol staining. Urosomoida paragiliformis n. sp. is characterized as follows: body elongate-elliptical with no tail, flexible and slightly contractile; cortical granules dark-brown, 0.5μm across, arranged in short irregular rows; about 33 adoral membranelles; 14 frontoventral-transverse cirri; right and left marginal rows not confluent posteriorly; two macronuclear nodules...
August 1, 2016: European Journal of Protistology
Aurelio Serrano
No abstract text is available yet for this article.
August 2016: European Journal of Protistology
Thomas Weisse
No abstract text is available yet for this article.
August 2016: European Journal of Protistology
Vera Slaveykova, Bettina Sonntag, Juan Carlos Gutiérrez
We report a summary of the symposium "Stress and Protists: No life without stress", which was held in September 2015 on the VII European Congress of Protistology in partnership with the International Society of Protistologists (Seville, Spain). We present an overview on general comments and concepts on cellular stress which can be also applied to any protist. Generally, various environmental stressors may induce similar cell responses in very different protists. Two main topics are reported in this manuscript: (i) metallic nanoparticles as environmental pollutants and stressors for aquatic protists, and (ii) ultraviolet radiation - induced stress and photoprotective strategies in ciliates...
August 2016: European Journal of Protistology
Pierangelo Luporini, Bill Pedrini, Claudio Alimenti, Adriana Vallesi
Among protists, pheromones have been identified in a great variety of algal species for their activity in driving gamete-gamete interactions for fertilization. Analogously in ciliates, pheromones have been identified for their activity in inducing the sexual phenomenon of conjugation. Although this identification was pioneered by Kimball more than fifty years ago, an effective isolation and chemical characterization of ciliate pheromones has remained confined to species of Blepharisma, Dileptus and Euplotes...
August 2016: European Journal of Protistology
Thomas Weisse, Ruth Anderson, Hartmut Arndt, Albert Calbet, Per Juel Hansen, David J S Montagnes
Functional ecology is a subdiscipline that aims to enable a mechanistic understanding of patterns and processes from the organismic to the ecosystem level. This paper addresses some main aspects of the process-oriented current knowledge on phagotrophic, i.e. heterotrophic and mixotrophic, protists in aquatic food webs. This is not an exhaustive review; rather, we focus on conceptual issues, in particular on the numerical and functional response of these organisms. We discuss the evolution of concepts and define parameters to evaluate predator-prey dynamics ranging from Lotka-Volterra to the Independent Response Model...
August 2016: European Journal of Protistology
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