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Adl, Sina, M. . et al.-- 116 pages, 1 figure, 4 tables, 3 appendices ; 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 ; 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 [.]; IC by CSF 18‐18699S; BE by RCN TaxMArc 268286/GMR; LG by ANR HAPAR (ANR‐14‐CE02‐0007); VH MK JL by ERDF; MEYS with ERC 771592 CZ 1.05/1.1.00/02.0109 BIOCEV; SK by RSF 16‐14‐10302; MK by CSF GA18‐28103S; CEL by NSF 1541510 and NIH‐AI124092; EL by CAM: 2017‐T1/AMB‐5210; and by grant 2017‐T1/AMB‐5210 from the program >Atracción de talentos> from the Consejería de Educación, Juventud y Deporte, Comunidad de Madrid; JL by ERC CZ LL1601 and OPVVV 16_019/0000759; MP by NSF DEB‐1455611; DJR by the Beatriu de Pinós postdoctoral programme of the Government of Catalonia's Secretariat for Universities and Research of the Ministry of Economy and Knowledge; CLS by the intramural research program of the National Library of Medicine, National Institutes of Health; AS by RSF 17‐14‐01391 and RFBR 16‐04‐01454 NY by NSF DEB 1557102; VZ by RFBR 16‐34‐60102 mol‐a‐dk; UniEuk and EukRef by the Gordon and Betty Moore Foundation ; 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 ...