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Ultrastructure of Diophrys appendiculata and new systematic consideration of the euplotid family Uronychiidae(Protista,Ciliophora)

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Marine Life Science & Technology 2022年第4期4卷 551-568页

作者： Jingyi Dong Yujie Liu Jiyang Ma Honggang Ma thorsten stoeck Xinpeng Fan School of Life Sciences East China Normal UniversityShanghai200241China Institute of Evolution&Marine Biodiversity Ocean University of ChinaQingdao266003China Laoshan Laboratory Qingdao266237China Ecology Group Technical University of Kaiserslautern67663KaiserslauternGermany

The ultrastructure of ciliates carries important cytological,taxonomical,and evolutionary signals for these single-celled eukaryotic ***,little ultrastructural data have been accumulated for most ciliate groups with systematic *** the present work,a well-known marine uronychiid,Diophrys appendiculata,was investigated using electron microscopy and a comparison with,and a discussion considering,phylogenetic analyses were *** new findings primarily show that:(i)this species lacks the typical alveolar plate,bears cortical ampule-like extrusomes,and has microtubular triads in the dorsal pellicle,and thus exhibits some ultrastructural features in common with most of its previously studied congeners;(ii)each adoral membranelle before the level of frontal cirrus II/2 contains three rows of kinetosomes and each membranelle after the level of frontal cirrus II/2 contains four rows,which might be related with morphogenesis and could be considered as a distinctive character of Diophrys;(iii)some structural details of the buccal field,such as the extra-pellicular fibrils,pellicle,pharyngeal disks and microtubular sheet,were *** addition,based on the ultrastructural comparison of representatives,we discuss the differentiation between the subfamilies Diophryinae and Uronychiinae.A hypothetical systematic relationship of members in the order Euplotida based on a wide range of data is also provided.

关键词： Ciliate Diophrys Euplotida Ultrastructure.Uronychidae

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Spatio-temporal patterns of zooplankton in a main-stem dam affected tributary: a case study in the Xiangxi River of the Three Gorges Reservoir, China

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Science China(Life Sciences) 2019年第8期62卷 1058-1069页

作者： Xinghao Li Jie Huang Sabine Filker thorsten stoeck Yonghong Bi Yuhe Yu Weibo Song Laboratory of Protozoology Institute of Evolution and Marine BiodiversityOcean University of ChinaQingdao266003China Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences and State Key Laboratory of Freshwater Ecologyand BiotechnologyInstitute of HydrobiologyChinese Academy of SciencesWuhan430072China Department of Molecular Ecology University of Technology KaiserslauternKaiserslautern67663Germany Department of Ecology University of Technology KaiserslauternKaiserslautern67663Germany Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdao266003China

As the ecologically important recipient channels for riverine ecosystems, tributaries provide unique microhabitats for microorganisms, among which zooplankton constitutes the most important heterotrophic organisms. In particular, the reduced water velocity caused by dams is more favorable for zooplankton development;therefore, dammed rivers are expected to support extremely diverse and abundant zooplankton communities and notably different spatiotemporal distribution patterns. So far,however, only very few molecular studies support these assumptions. Using high-throughput sequencing, a high number of 350 operational taxonomic units(OTUs;97% cutoff) were retrieved from 30 samples collected in the Xiangxi River, the nearest large tributary upstream of the Three Gorges Dam. Zooplankton did not show significant spatial distribution in the channel. Instead,the community structures varied significantly over sampling dates, corroborating the seasonal patterns found in lakes and ponds in the subtropical zone. As expected, the community compositions were deterministically governed by environmental filtering processes(phylogenetic clustering), in which water velocity appeared to be much less important than other investigated environmental factors. Moreover, most of the detected phylotypes(OTUs) had a relatively high(>90%) sequence similarity to previously deposited sequences, suggesting a mediocre degree of genetic novelty within the zooplankton communities in the Xiangxi River.

关键词： zooplankton high-throughput sequencing spatiotemporal distribution genetic novelty tributary main-stem dam

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Protocruzia,a highly ambiguous ciliate(Protozoa;Ciliophora):Very likely an ancestral form for Heterotrichea,Colpodea or Spirotrichea? With reevaluation of its evolutionary position based on multigene analyses

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中国科学：生命科学英文版 2010年第1期53卷 131-138页

作者： thorsten stoeck Shin Mann Kyoon Al-Rasheid Khaled A. S. Al-Khedhairy Abdulaziz A. Department of Ecology University of Kaiserslautern Department of Biology University of Ulsan Zoology Department King Saud University

The ciliate genus Protocruzia belongs to one of the most ambiguous taxa considering its systematic position,possibly as a member of the classes Heterotrichea,Spirotrichea or Karyorelictea,which is tentatively placed into Spirotrichea in Lynn’s 2008 *** test these hypotheses,multigene trees(Bayesian inference,evolutionary distance,maximum parsimony,and maximum likelihood) were constructed using the small subunit rRNA(SSU rRNA) gene,internal transcribed spacer 2(ITS2) and a protein coding gene(histone H4).All analyses agree that:(1) four morphotypes of Protocruzia from different geographical origins group together and form a monophyletic clade,which cannot be assigned to any of the eleven described ciliate classes;(2) it is invariably positioned on an isolated branch separated from the class Spirotrichea suggesting that this clade should be clearly removed from Spirotrichea;(3) this leads us to hypothesize that this taxon may indeed represent a lineage on a class *** on the fact that it is,both morphologically and in molecular features,closely related to the heterotrichs,Colpodea and Oligohymenophorea,Protocruziida might be an ancestral form for the subphylum Intramacronucleata in the evolutionary line from the class Heterotrichea(subphylum Postciliodesmatophora) to higher taxa.

关键词： SSU rRNA gene internal transcribed spacer 2(ITS2) gene histone H4 gene phylogenetic position Protocruzia Protocruziidea new class

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Report and Phylogeny of a Novel Euplotes Species from China:*** ***.,and Review of ***(Alveolata,Ciliophora)

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Journal of Ocean University of China 2023年第3期22卷 831-841页

作者： LIAN Chunyu JIANG Jiamei XI Muchen DONG Jingyi MA Honggang AL-FARRAJ Saleh A stoeck thorsten WANG Chundi SHAO Chen Laboratory of Protozoological Biodiversity and Evolution in Wetland College of Life SciencesShaanxi Normal UniversityXi’an 710119China Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution Shanghai Ocean UniversityShanghai 201306China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China Zoology Department College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Ecology University of KaiserslauternKaiserslautern 67663Germany Marine College Shandong UniversityWeihai 264209China

The freshwater species,Euplotes mazeii ***.,and the marine species,***(Dujardin,1841)Diesing,1850 were collected from China and investigated based on their living morphology,ciliary pattern,and small subunit ribosomal RNA(SSU rRNA)gene sequence *** mazeii *** characterized by its small cell size((40-55)μm×(25-35)μm),nine frontoventral cirri,one marginal and two caudal cirri,seven dorsal kineties,and a double-eurystomus type of dorsal silverline *** analyses based on molecular data confirmed the branching position of this new taxa within the genus Euplotes,with 5.01%(84 nucleotides)sequence variation,supporting the identification of a new *** re-examined all described and supposedly conspecific populations and give a review of Euplotes *** has been reported frequently;however,*** sensu Agamaliev,1968 is different from other populations in the number of marginal cirri or the type of silverline system,which suggests there might be a *** SSU rRNA gene sequences of two populations of *** from the studies of Chen et al.(2013)and Pan et al.(2012)differ from each other by more than 135 nucleotides,implying that the identity of the species currently associated with the SSU rRNA gene sequence in molecular databases requires further confirmation.

关键词： biodiversity molecular analysis morphology systematic placement

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