Taxonomic studies on seven species of Dysteria (Ciliophora, Cyrtophoria), including a description of Dysteria paraprocera sp. n.

Qu, Zhishuai; Wang, Chundi; Gao, Feng; Li, Jiqiu; Al‐Rasheid, Khaled A. S.

doi:10.1016/j.ejop.2015.04.005

Cited by 17 publications

(18 citation statements)

References 23 publications

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“…Culturing and morphological examination of these species were according to Qu et al . (,b). Species identification was based on published guides and descriptions (Deroux ; Song & Wilbert ; Gong ).…”

Section: Methodsmentioning

confidence: 99%

New considerations on the phylogeny of cyrtophorian ciliates (Protozoa, Ciliophora): expanded sampling to understand their evolutionary relationships

et al. 2015

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S. (2015). New considerations on the phylogeny of cyrtophorian ciliates (Protozoa, Ciliophora): expanded sampling to understand their evolutionary relationships. -Zoologica Scripta, 45, 334-348. To rationalize the confusing relationships among the cyrtophorian ciliates, we expanded the taxon sampling by sequencing the small subunit ribosomal RNA (SSU rRNA) gene of representatives of 12 genera (20 species, 23 new sequences). The SSU rRNA sequences of Spirodysteria, Agnathodysteria, Brooklynella and Odontochlamys are reported for the first time. Phylogenetic trees were constructed, and secondary structures of variable region 4 (V4) of all genera for which SSU rRNA gene sequence data are available were predicted. The results indicate that (i) Brooklynella is likely an intermediate taxon between Dysteriidae and Hartmannulidae; (ii) the genus Dysteria is paraphyletic with Spirodysteria and Mirodysteria nested within it; (iii) the genus Agnathodysteria is well separated from Dysteria based on both molecular and morphological data; and (iv) Trithigmostoma is a basal genus of Chilodonellidae, based on both the morphological and molecular data.

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Section: Methodsmentioning

confidence: 99%

New considerations on the phylogeny of cyrtophorian ciliates (Protozoa, Ciliophora): expanded sampling to understand their evolutionary relationships

et al. 2015

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“…2). As discovered by others (Gao et al, 2012;Qu et al, 2015;Zhao, et al, 2014), the orders Chlamydodontida and Dysteriida, as defined by Lynn (2008), are not monophyletic. The best ML tree placed the genus Trochochilodon (family Plesiotrichopidae; Lynn, 2008) basal to the dysteriid radiation.…”

Section: Molecular Characterization and Phylogenetic Analysesmentioning

confidence: 99%

“…and Isochona sp. Recent molecular genetic research has confirmed the genetic identities of Chlamydodon, Dysteria, Acineta and Ephelota to other species assigned to these genera (unpublished data; Gao et al, 2012;Qu et al, 2015;Zhao et al, 2014). However, there has been some skepticism about the validity of the sequence from Isochona sp.…”

Section: Introductionmentioning

confidence: 99%

The small subunit rRNA gene sequence of the chonotrich Chilodochona carcini Jankowski, 1973 confirms chonotrichs as a dysteriid-derived clade (Phyllopharyngea, Ciliophora)

Lynn

2016

International Journal of Systematic and Evolutionary Microbiology

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The chonotrichs are sessile ciliated protozoa that are ectosymbiotic on the body parts of a variety of crustaceans. They have long been considered a separate group because their sessile habit has resulted in the evolution of a very divergent body form and reproductive strategy compared to free-living ciliates. In the mid-20th Century, the free-living dysteriid cyrtophorian ciliates were proposed as a potential sister clade because the chonotrich bud or daughter cell showed similarities during division morphogenesis (i.e. ontogeny) to these free-living dysteriids. A single small subunit (SSU) rRNA gene sequence is available for the chonotrich Isochona sp. However, its authenticity has recently been questioned, and the placement of this sequence within the dysteriid clade has added to this controversy. In this report, the SSUrRNA gene sequence of the chonotrich Chilodochona carcini, ectosymbiotic on the green crab Carcinus maenas, is provided. Topology testing of the SSUrRNA gene phylogeny, constructed by Bayesian Inference, robustly supports the sister-group relationship of Isochona sp. and Chilodochona carcini, the monophyly of these two chonotrichs, and the divergence of the chonotrich clade within the dysteriid clade. INTRODUCTIONThe chonotrichs, which are sessile symbionts, typically on the mouthparts of crustaceans, have long been recognized as a group of ciliates, although their position within the phylum was not stable until the late 20th Century (Corliss, 1979). Like the sessile suctorians and peritrichs, chonotrichs were separated out from other more motile groups at a high taxonomic rank, primarily because of their sessile nature and the unusual morphology associated with their sessility. Guilcher (1951) carefully studied the morphology of the dispersive/divisional stage of the chonotrichs, the bud or swarmer, and recognized homologies with free-living cyrtophorian ciliates, a conclusion confirmed by, among others, Dobroza nska-Kaczanowska (1963). Grain & Batisse (1974) examined the cortical microtubular components of Chilodochona and found strong similiarities to the cortical components of free-living cyrtophorians, and Fahrni (1982) provided similar data for the cortex of Spirochona gemmipara. These observations strengthened further the hypothesis that the chonotrichs arose from a free-swimming cyrtophorian, perhaps a dysteriid-like ancestor. Ultrastructural examination of the attachment apparatus of chonotrichs also showed significant similarities to the attachment apparatus of dysteriid ciliates (Fahrni 1984;Faur e-Fremiet et al., 1968; Faur e-Fremiet et al., 1956). Snoeyenbos-West et al. (2004) sequenced the small subunit (SSU) rRNA genes of several phyllopharyngean ciliates, including a species of the chonotrich genus Isochona. The Isochona gene sequence robustly clustered within the cyrtophorian clade, sister to the genes of Dysteria species. While Snoeyenbos-West et al. (2004) provided photographic evidence for their identification of the free-living cyrtophorians, Chlamydodon and Dysteria, an...

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“…They are also considered as epibionts living on different species from small crustaceans to large turtles, plants ( Marino-Perez et al , 2010 ), algae ( Moawad, 2010 ) and Cnidaria ( Tazioli and Di Camillo, 2013 ). One OTU is related to the genus Dysteria (Phyllopharyngea, Ciliophora), a group of cyrtophorids that has been found worldwide in the periphyton or as ecto-commensal ( Qu et al , 2015 ). Another OTU, assigned to the clade MAST-12, corresponded to basal heterotrophic Stramenopiles that are distributed in a set of polyphyletic ribogroups collectively named MAST (marine stramenopiles), which have been found in both marine and freshwater environments ( Massana et al , 2014 ; Simon et al , 2015 ).…”

Section: Resultsmentioning

confidence: 99%

Aquatic urban ecology at the scale of a capital: community structure and interactions in street gutters

Hervé

Leroy

Pires³

et al. 2017

The ISME Journal

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In most cities, streets are designed for collecting and transporting dirt, litter, debris, storm water and other wastes as a municipal sanitation system. Microbial mats can develop on street surfaces and form microbial communities that have never been described. Here, we performed the first molecular inventory of the street gutter-associated eukaryotes across the entire French capital of Paris and the non-potable waters sources. We found that the 5782 OTUs (operational taxonomic units) present in the street gutters which are dominated by diatoms (photoautotrophs), fungi (heterotrophs), Alveolata and Rhizaria, includes parasites, consumers of phototrophs and epibionts that may regulate the dynamics of gutter mat microbial communities. Network analyses demonstrated that street microbiome present many species restricted to gutters, and an overlapping composition between the water sources used for street cleaning (for example, intra-urban aquatic networks and the associated rivers) and the gutters. We propose that street gutters, which can cover a significant surface area of cities worldwide, potentially have important ecological roles in the remediation of pollutants or downstream wastewater treatments, might also be a niche for growth and dissemination of putative parasite and pathogens.

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Taxonomic studies on seven species of Dysteria (Ciliophora, Cyrtophoria), including a description of Dysteria paraprocera sp. n.

Cited by 17 publications

References 23 publications

New considerations on the phylogeny of cyrtophorian ciliates (Protozoa, Ciliophora): expanded sampling to understand their evolutionary relationships

New considerations on the phylogeny of cyrtophorian ciliates (Protozoa, Ciliophora): expanded sampling to understand their evolutionary relationships

The small subunit rRNA gene sequence of the chonotrich Chilodochona carcini Jankowski, 1973 confirms chonotrichs as a dysteriid-derived clade (Phyllopharyngea, Ciliophora)

Aquatic urban ecology at the scale of a capital: community structure and interactions in street gutters

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