Suchergebnisse

Publisher's version (útgefin grein) ; We isolated an encysted ciliate from a geothermal field in Iceland. The morphological features of this isolate fit the descriptions of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 very well. These comprise body shape and size in vivo, the number of somatic kineties, and the positions of macronucleus and contractile vacuole. Using state-of-the-art taxonomic methods, the species is redescribed, including phylogenetic analyses of the small subunit ribosomal RNA (SSU rRNA) gene as molecular marker. In the phylogenetic analyses, D. colpidiopsis clusters with the three available SSU rRNA gene sequences of congeners, suggesting a monophyly of the genus Dexiotricha. Its closest relative in phylogenetic analyses is D. elliptica, which also shows a high morphological similarity. This is the first record of a Dexiotricha species from a hot spring, indicating a wide temperature tolerance of this species at least in the encysted state. The new findings on D. colpidiopsis are included in a briefly revision of the scuticociliate genus Dexiotricha and an identification key to the species. ; This study was funded by grants awarded to TS by Europlanet 2020 (project 15-EPN-006) and by the Bundesministerium für Bildung und Forschung (BMBF)/Deutsches Zentrum für Luft- und Raumfahrt (DLR, grant 50WB1737). Europlanet 2020 RI has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 654208. Zhishuai Qu received funds from the China Scholarship Council (CSC). We thank Fengchao Li for his support with species identification and Natasa Desnica (Matis) for the trace metal analysis. ; Peer Reviewed

This revision of the classification of eukaryotes follows that of Adl et al., 2012 [J. Euk. Microbiol. 59(5)] and retains an emphasis on protists. Changes since have improved the resolution of many nodes in phylogenetic analyses. For some clades even families are being clearly resolved. As we had predicted, environmental sampling in the intervening years has massively increased the genetic information at hand. Consequently, we have discovered novel clades, exciting new genera and uncovered a massive species level diversity beyond the morphological species descriptions. Several clades known from environmental samples only have now found their home. Sampling soils, deeper marine waters and the deep sea will continue to fill us with surprises. The main changes in this revision are the confirmation that eukaryotes form at least two domains, the loss of monophyly in the Excavata, robust support for the Haptista and Cryptista. We provide suggested primer sets for DNA sequences from environmental samples that are effective for each clade. We have provided a guide to trophic functional guilds in an appendix, to facilitate the interpretation of environmental samples, and a standardized taxonomic guide for East Asian users. ; ACKNOWLEDGEMENTS. After the first author, D. Bass, C.E Lane, J. Lukes, C. L. Schoch and A. Smirnov have contributed equally and are to be considered second authors; subsequent authors are listed alphabetically and are to be considered third authors. We were saddened and hurt by the untimely loss of two dear colleagues, D.H. Lynn and J. Clamp, both ciliatologists. Research support was provided as follows: SMA by NSERC 249889-2007; DB by NERC NE/H009426/1 and NE/H000887/1; MWB by NSF 1456054; FB by a Fellowship from Science for Life Laboratory and VR/2017-04563; PC by EU-Horizon 2020 research and innovation program through the SponGES project 679849 (This document reflects only the authors' view and the Executive Agency for Small and Medium-sized Enterprises (EASME) is not responsible for any use that ...