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The ciliate genus Pleuronema comprises approximately 30 nominal species and has been reported in freshwater, brackish water, and marine habitats. Nevertheless, recent studies have indicated that there might be a large undiscovered species diversity. In the present work, four new Pleuronema species, namely P. foissneri sp. nov., P. parasmalli sp. nov., P. parasalmastra sp. nov., and P. paraorientale sp. nov., collected from Shenzhen, southern China, was investigated using taxonomic methods. The diagnosis, description, comparisons with morphologically related species and detailed morphometric data are supplied for each. The small subunit ribosomal RNA (SSU rRNA) gene of the four new species is sequenced and their molecular phylogeny is analyzed. The SSU rRNA gene tree shows that Pleuronema is polyphyletic comprising several separate clades. All four new species cluster consistently with P. orientale KF206429, P. puytoraci KF840520 and P. setigerum FJ848874 within the core Pleuronematidae + Peniculistomatidae clade. Phylogenies of Pleuronematidae-related taxa are also discussed.

The novel 3D “Fistular onion flower” CNCP-350 benefits from the abundance of dual-category activity sites, demonstrating an excellent efficient catalytic performance in UOR and HER.

Developing electrode materials to apply in anodes and cathodes with superior kinetics and high specific capacity still remains a serious challenge for potassium-ion hybrid capacitors (PIHCs). Herei...

Three Diophrys species, D. quadrinucleata n. sp., D. oligothrix Borror, 1965 and D. scutum (Dujardin, 1841) Kahl, 1932, were identified from the subtropical brackish waters in China, their morphology was investigated using live observation and protargol impregnation. D. quadrinucleata n. sp. can be distinguished from the congeners by four ellipsoidal macronuclear nodules. Phylogenetic analyses show that the three species with single marginal cirrus are closely related, namely D. quadrinucleata n. sp., D. apoligothrix Song et al., 2009 and D. japonica Hu, 2008. Our population of D. oligothrix corresponds very well with previous populations in both living morphology and ciliature. However, the SSU rDNA sequences of three well-described populations differ from each other by 11 to 18 nucleotides, indicating that there might be cryptic species in D. oligothrix. Moreover, we provided a detailed description of the symbiotic bacteria/archaeobacteria (?) concentrated on the back surface of D. scutum based on the present population, which was either overlooked or misinterpreted as cortical granules previously.

The peritrichous genus Ophrydium is relatively distinctive since its colonies have a gelatinous lorica. In the present work, one morphologically well-described species, Ophrydium crassicaule, was collected from a freshwater habitat in China. Both morphological characters and sequence data for SSU rDNA, ITS1-5.8S-ITS2 region and LSU rDNA were obtained. Morphologically, O. crassicaule is characterized by its elongated vase-shaped zooid, single-layered peristomial lip, dichotomously branched stalk, colony with gelatinous lorica, and infundibular polykinety 3 (P3) containing one short inner row and two long outer rows. Phylogenetic analyses revealed that the genus Ophrydium is monophyletic and nests within the family Vorticellidae. In addition, we briefly revise the nominal congeners for aiding the species identification in future studies.

Two colonial sessilid peritrichs, Epistylis qingdaoensis n. sp. and Carchesium cyclopidarum Nenninger, 1948, were isolated from a marine crustacean and a freshwater mayfly, respectively. Morphological characters for each species were revealed by in vivo observations and silver staining methods. Epistylis qingdaoensis n. sp. is characterized by the apperance of the colony which is up to 250 μm high and usually contains fewer than eight zooids, the single-layered peristomial lip, the conspicuously conical peristomial disc, and the structure of infundibular polykinety 3 which comprises three isometric ciliary rows. Carchesium cyclopidarum is recognized by the colony height of about 600 μm, the small zooid size of 35-50 × 20-30 μm, and the low number of silverlines. Phylogenetic analyses based on small subunit ribosomal DNA sequences were performed to reveal their evolutionary relationships. Surprisingly, neither species clustered with its congeners. Epistylis qingdaoensis n. sp. nested within a clade of Zoothamnium species that was sister to a clade comprising core Epistylis species and several Zoothamnium species. Carchesium cyclopidarum nested within a clade comprising solitary peritrichs and was distantly related to the type species of Carchesium, C. polypinum. These findings imply for the first time that Carchesium is non-monophyletic.

The morphology and ciliature of a new freshwater ciliate

The morphology and ciliature of a new freshwater ciliate, Frontonia apoacuminata sp. nov., isolated from an artificial pond in Qingdao, PR China, were investigated using live observation and silver staining methods. The main features separating F. apoacuminata sp. nov. from its congeners are as follows: a broad elliptical body that is slightly pointed at the posterior end, four ophryokineties, one or two spherical micronuclei of a ‘compact’ type, a dorsally positioned contractile vacuole, and peniculi 1–3 each with five kinetosome rows though the left-most two rows in peniculus 3 are extremely shortened (with only two or three kinetosomes each). Additionally, an improved diagnosis of F. acuminata is provided. Phylogenetic analyses based on the small subunit ribosomal RNA (SSU rRNA) gene show that F. apoacuminata sp. nov. clusters with F. atra, F. minuta, F. acuminata and F. terricola. These five species group with Disematostoma, Marituja and Stokesia rather than with other Frontonia species, causing polyphyly of the genus Frontonia.

Three epibiotic Epistylis species, i.e., Epistylis weishanensis sp. nov., Epistylis daphniae Fauré-Fremiet, 1905, and Epistylis pygmaeum (Ehrenberg, 1838) Foissner et al., 1999, were investigated based on their living morphology, infraciliature, and small subunit (SSU) rDNA sequence data. Epistylis weishanensis sp. nov. is characterized by its double-layered peristomial lip, contractile vacuole located on the dorsal wall of the infundibulum, infundibular polykinety 3 (P3) composed of three equal-length rows that terminate above infundibular polykinety 1 (P1), 50-62 silverlines between the peristome and the trochal band, and about 30 silverlines between the trochal band and the scopula. Based on previous and newly obtained data for E. daphniae and E. pygmaeum, improved diagnoses and redescriptions are provided including, for the first time, data on their infraciliature. Phylogenetic analyses reveal that all three species do not group within the major clade of Epistylis, supporting the assertion that the genus Epistylis should be an assemblage of morphospecies and therefore needs to be revised.

Ampullofolliculina Hadži, 1951 is a monotypic genus, the only species being A. lageniformis which was first discovered in estuarine habitats in the U.S. and has never been redescribed. In the present study, we investigated the taxonomy and phylogeny of A. lageniformis Hadži, 1951 based on analyses of a population collected from a brackish wetland in Ningbo, China. The main characteristics of this species are as follows: trophont about 450-700 μm long in vivo with two short, rounded peristomial lobes of equal size; lorica flask-shaped, transparent and smooth with a short, wide neck at the base of which two transparent valves are asymmetrically inserted; cortex with brownish to reddish cortical granules and greenish pigment granules; about 80 somatic kineties evenly arranged; moniliform macronucleus with 4-8 ellipsoidal nodules; swarmer dark green, vermiform in shape, about 200-350 μm long in vivo, with about 60 adoral membranelles and 85 somatic kineties, no mouth nor paroral membrane. Phylogenetic analyses inferred from SSU rDNA sequences show that A. lageniformis is closely related to Folliculina and Eufolliculina which nest within a large clade that comprises five families, i.e. Stentoridae, Blepharismidae, Fabreidae, Maristentoridae, and Folliculinidae.

A novel polyoxometalate-based metal–organic framework templated by twin-Dawson clusters, [{Cu3(μ3-O)}2(trz)6Cu2(H2O)13][H1.73P2As1.73W16.27O62]·8.25H2O (1) (trz = 1,2,4-triazole), has been synthesized under hydrothermal conditions. In 1, there are two crystal distinct motifs: a 3D metal–organic nanotube framework and seven-connected Dawson clusters. It is worth mentioning that the 3D framework possesses nanotube-like channels. The twin-H1.73P2As1.73W16.27O62 clusters (abbreviated as P2(As/W)18 clusters) as templates occupy channels of the nanotube framework. To the best of our knowledge, this represents the first metal–organic nanotube framework templated by twin-Dawson clusters. The electrochemical experiments indicate that the 1-based glassy carbon electrode (1-GCE) possesses high catalytic efficiency and high stability toward reduction of inorganic bromate molecules and oxidation of the biological molecule ascorbic acid. The electrocatalytic efficiency towards the reduction of bromate in 1 M H2SO4 solution and oxidation of AA in N2 purged solution is ca. 848.4% and 896.8% (catalytic substrate: 0.5 mM), respectively. The current signal after 100 cycles exhibits almost no loss for 1-GCE.

Members of the genus Paradileptus are apex predators in microbial food webs. They are often encountered in freshwater biotopes and have been used in research on water quality monitoring and ecology. Nevertheless, our understanding of the biodiversity of Paradileptus, especially its ecological and genetic diversities, is very poor which hinders our ability to understand the ecosystem services it provides. The present study gives a detailed account of two Chinese populations of Paradileptus elephantinus and P. conicus including their living morphology, infraciliature, and molecular phylogenies based on 18S, 5.8S, and ITS ribosomal DNA sequences. The phylogenetic relationships between these two species and other rhynchostomatians are investigated. We also explore the potential contribution of differentiation of the proboscis (e.g., extrusomes, dorsal brush, and differentiated kineties) to niche partitioning and speciation in Paradileptus. The global distribution of Paradileptus is summarized based on published data. Finally, a key to the identification of the valid species of Paradileptus is provided.

Morphogenesis is an important process that widely occurs in almost all the organisms, including the ciliated protists. Ciliates are a large group of single-celled eukaryotes that can reproduce asexually (e.g., binary fission) and perform sexual process (e.g., conjugation). Morphogenesis happens in both asexual reproduction and sexual process in ciliates and the reorganization during conjugation is more complex. However, studies of morphogenesis focusing on conjugation are very limited. Here we studied the morphogenetic process during conjugation in the marine species Euplotes raikovi Agamaliev, 1966. The results indicate that: (1) the ciliature in the ventral side reorganizes twice during sexual process, i.e., conjugational and postconjugational reorganization; (2) the adoral zone of membranelles (AZM) is generated de novo in a pouch beneath the cortex during both reorganizations, with the anterior part generated during the first reorganization, while the posterior part formed during the second reorganization; (3) the frontoventral-transverse (FVT) cirri anlagen are formed de novo in both processes with the fragmentation pattern of 2:2:3:3:2; (4) one left marginal cirrus is generated de novo during both reorganizations; and (5) the dorsal ciliature remains intact during the whole process, except that the two caudal cirri originate from the end of the right-most two dorsal kineties during both reorganizations. Comparisons of the morphogenetic process during conjugation demonstrate a considerably stable pattern within Euplotes while the patterns vary dramatically among different ciliate groups.

The class Oligohymenophorea is one of the most diverse assemblage of ciliated protists, which are particularly important in fundamental biological studies including understanding the evolutionary relationships among the lineages. Phylogenetic relationships within the class remain largely elusive, especially within the subclass Peniculia, which contains the long-standing problematic taxa Urocentrum and Paranassula. In the present study, we sequenced the genomes and/or transcriptomes of six non-culturable oligohymenophoreans using single-cell sequencing techniques. Phylogenomic analysis was performed based on expanded taxon sampling of 85 taxa, including 157 nuclear genes encoding 36,953 amino acids. The results indicate that: (1) urocentrids form an independent branch that is sister to the clade formed by Scuticociliatia and Hymenostomatia, which, together with the morphological data, supports the establishment of a new subclass, Urocentria n. subcl., within Oligohymenophorea; (2) phylogenomic analysis and ortholog comparison reveal a close relationship between Paranassula and peniculines, providing corroborative evidence for removing Paranassula from Nassulida and elevating it as an order, Paranassulida, within the subclass Peniculia; (3) based on the phylogenomic analyses and morphological data, we hypothesize that Peritrichia is the earliest diverging clade within Oligohymenophorea while Scuticociliatia and Hymenostomatia share the most common ancestor, followed successively by Urocentria and Peniculia. In addition, stop codon analyses indicate that oligohymenophoreans widely use UGA as the stop codon, while UAR are reassigned to glutamate (peritrichs) or glutamine (others), supporting the evolutionary hypothesis.

The peritrich genus Epistylis is speciose, however many species lack complete morphological description based on modern criteria and/or molecular data. In the present study, one new species, i.e., E. foissneri n. sp., and two morphologically similar species, i.e., E. hentscheli Kahl, 1935 and E. vaginula Stokes, 1884, collected from freshwater habitats in China, were studied. Epistylis foissneri n. sp. is characterized by its extremely slender zooids encased in a gelatinous sheath, symmetrically dichotomously branched stalk, trochal band located at mid-body, contractile vacuole located on dorsal wall of infundibulum, infundibular polykinety 3 (P3) composed of three equal-length rows that terminate above infundibular polykinety 1 (P1), 105-110 silverlines between the peristome and the trochal band, and about 110 silverlines between the trochal band and the scopula. Epistylis hentscheli is characterized by its asymmetric pyriform zooids (average length ca. 160 μm in vivo), dichotomously branched stalk with transverse striations on the surface of the upper portion, P3 three-rowed and terminating slightly above P1, 60-75 silverlines between the peristome and the trochal band, and 55-90 silverlines between the trochal band and the scopula. Epistylis vaginula is characterized by its elongated body shape (about 100 μm in length in vivo), dichotomously branched and smooth stalk, P3 three-rowed and terminating above P1, 80-100 silverlines between the peristome and the trochal band, and 45-80 silverlines between the trochal band and the scopula. The small subunit ribosomal DNA gene (SSU rDNA) of these three species was sequenced and supported the validity of each. Phylogenetic analyses based on SSU rDNA sequence data revealed that all three morphospecies group with other congeners within the major clade of Epistylis.

Cluster-based coordination polymers (CCPs) have shown promise as capacitors. To investigate the relativity between capacitor performance and crystal structure, herein, five new CCPs based on organophosphorus Strandberg-type clusters were synthesized via in situ hydrothermal reactions at different pH's, namely, (H

During an investigation of parasitic ciliates in northern China, two Trichodina species, T. acuta Lom, 1970 and T. nigra Lom, 1960, were isolated from the freshwater fish Cyprinus carpio Linnaeus, 1758. The morphology of each species was investigated based on dry silver nitrate-stained specimens. In addition, the molecular phylogeny of each was analyzed based on small subunit ribosomal DNA (SSU rDNA) sequence data. Trichodina acuta can be distinguished from its congeners by the undefined periphery of the central circle, the distinct gap between the rays and the central circle, and the distinctly sickle-shaped blades. Trichodina nigra is a cosmopolitan ciliate and is characterized by its densely linked denticles, broad, rounded spatula-shaped blades, robust central parts, and well developed rays. Phylogenetic analyses revealed that T. acuta and T. nigra nest within different clades, supporting the assertion that the GC content of SSU rDNA sequences could reflect evolutionary relationships among Trichodina species.

Miamiensis avidus Thompson & Moewus, 1964, is a cosmopolitan and well-known marine pathogenic ciliated protist. However, the taxonomy of this species up to now has remained controversial, especially with respect to the validity of the morphologically similar species, Philasterides dicentrarchi, which was considered as a junior synonym of M. avidus. In this study, a population of M. avidus was collected from the skin of pharaoh cuttlefish (Sepia pharaonis) cultured near the East China Sea, Ningbo, China and its morphology and phylogeny were investigated in detail based on living characters, infraciliature, small subunit (SSU) rDNA and ITS1-5.8S-ITS2 region sequences. In addition, the morphometrics of a previously reported free-living population, collected from the Bohai Sea, were rechecked and analyzed. We compared the present two isolates with all historic populations of M. avidus and P. dicentrarchi, and found that their morphological characters were either highly similar or exactly identical, indicating that they are the same morphospecies. However, the phylogenetic analyses based on SSU rDNA or ITS1-5.8S-ITS2 region sequences revealed that most M. avidus and P. dicentrarchi populations formed one clade, and the two isolates of M. avidus from Weifang and American Type Culture Collection clustered in another clade, which indicated that there might be cryptic species in Miamiensis avidus.

A new polyoxovanadate-based metal–organic framework, [Cu(Pz)](V4O10) (1) (Pz = Pyrazine) has been synthesized under hydrothermal conditions. Single crystal X-ray diffraction analysis reveals that compound 1 displays a 3D framework with a rare reduced V4O102− layer. The electrochemical study shows that 1 exhibits bifunctional electrocatalytic activities toward reduction of iodate and oxidation of ascorbic acid. Surface photovoltage spectroscopy (SPS) and electric field induced surface photovoltage spectroscopy (EFISPS) measurements reveal that 1 has the behavior of an n-type semiconductor. In addition, 1 shows excellent photocatalytic activity for the decomposition of Rhodamine-B dye under visible light.

The temporal dynamics of ciliate community structure in a southern Chinese shrimp aquaculture facility were investigated during the period June–September 2012. A total of 53 species belonging to 37 genera and 17 orders were recorded based on analyses of eight samples. Ciliate abundance peaked between 16 August and 14 September 2012, while the maximum number of species occurred on 26 June 2012. Clear temporal patterns were observed in the ciliate community structure. The patterns of succession of the 10 most abundant species were consistent with the results of a Canonical Analysis of Principal coordinates (CAP) analysis. Correlation analyses showed that these patterns of succession were related to temporal changes in environmental variables. In summary, the results demonstrate that the ciliate community responds predictably to environmental variations and recovers from shrimp cultivation.

Two new polyoxometalate-based coordination polymers have been synthesized at different pHs under identical hydrothermal conditions, (Hbib)[Cu2(bib)2(PMo12O40)] (1) and (Hbib)2[Cu(bib) (PMo12O40)]·2H2O (2) (bib = 4-bis(imidazol-1-yl) benzene). Their structures were determined by single crystal X-ray diffraction analyses and characterized by routine methods. When the pH was adjusted to 2.0 − 2.5, 1 was obtained, which exhibits a 1-D rail-like chain. Compound 2 was obtained at pH of 2.5 − 3.2 and exhibits a 2-D layer with (44) sql net. The pH of the reaction plays a key role in the assembly of the polyoxometalate-based coordination polymer. The electrochemical experiments indicate that 2-based carbon paste electrode possesses high catalytic efficiency and high stability towards reduction of iodate and oxidation of ascorbic acid.

Members of the genus Thuricola are a highly specialized group of peritrichous ciliates possessing a protective barrel-shaped lorica. The genus presents many difficulties in terms of species separation and definition, and in this context the present study investigates three species by protargol staining and analyses of SSU rDNA sequences. Based on their morphologic characteristics and biotope, they were identified as three poorly known forms in Thuricola, namely T. obconica Kahl, 1933, T. kellicottiana (Stokes, 1887) Kahl 1935 and T. folliculata Kent, 1881, respectively. T. obconica is characterized by possessing curved lorica and a single valve in vivo. T. kellicottiana is distinguished by two valves with a spine on the main valve, and a generally long internal stalk upon which the zooids sit. T. folliculata also has two valves but lacks a spine. The ciliature of the three species are basically similar. The main features are characterized as follows: infundibular polykineties 1-3 (P1-3) are relatively long and composed of three rows each; P1 bends twice and comprises three equally long rows; P2 ends near the second bend of P1 with all rows exhibiting a staggered arrangement; P3 converges with P1 at adstomal end, its row 1 at least twice as long as the other two rows; epistomial membranes 1 and 2 are present. Silverline system in Vorticella-pattern. Phylogenetic analyses indicate that the three ciliates in this study cluster together within one of the two major sub-clades within the Vaginicolidae. CA extern

A novel polyoxometalate-encapsulating polycatenated metal-organic framework, (bib)0.5[Cu2(bib)3.5(GeW12O40)]·H2O (1) (bib = 1,4-bis(1-imidazol-yl)-2,5-dimethyl benzene), has been synthesized under hydrothermal conditions. In compound 1, 1D molecular ladders and 2D square grid layers is further catenated to the two adjacent such motifs in inclined fashion to give an 1D+2D→3D polycatenaned metal-organic framework with nanotube channels, in which nanosized Keggin anions as guests are encapsulated for the first time. Compound 1 represents a first case of Keggin-type polyoxometalate-encapsulating 1D+2D→3D polycatenated metal-organic framework. The electrochemical studies show that modified electrode of 1 exhibits highly efficient electrocatalytic activity toward reduction of inorganic molecule bromate (BrO3-). The electrocatalytic reaction mechanism of 1-GCE toward reduction of BrO3- has been illuminated. The photoluminescence property of 1 was also investigated.

The morphology and infraciliature of a poorly-known colepid ciliate, Pinacocoleps tesselatus (Kahl, 1930) Foissner et al ., 2008, collected from brackish-water biotope (salinity 12 ‰) in Hangzhou Bay, China, were investigated using live obser-vations and silver impregnations. This species is characterized by its length of 60–85 μm in vivo , ovular shape, two ante-rior and three posterior spines, 21–25 longitudinal and 11 transverse ciliary rows on average, a macro and micro nucleus, and one terminal contractile vacuole. The key to all known seven Pinacocoleps species is updated. Additionally, we char-acterized the taxon P. tesselatus via small subunit rRNA gene data. Our phylogenetic analyses performed using both max-imum-likelihood and Bayesian methods indicate that P. tesselatus falls into the core assemblage of the family Colepidae.