Journal
OPEN BIOLOGY
Volume 12, Issue 4, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsob.210376
Keywords
phylogenetic artefacts; Cryptista; Cryptophyceae; Goniomonadea; global eukaryotic phylogeny
Categories
Funding
- Japan Society for the Pro-motion of Science [18KK0203, 19H03280, 11J04684, 17K19434]
- Tree of Life Project of University of Tsukuba
- Grants-in-Aid for Scientific Research [19H03280, 17K19434, 11J04684, 18KK0203] Funding Source: KAKEN
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By clarifying the phylogenetic positions of 'orphan' protists, this study reveals the novel affiliation between major lineages in eukaryotes. The analysis of a 319-gene alignment demonstrates that M. maris represents a basal lineage of Cryptista and proposes a new clade name 'Pancryptista'. Additionally, M. maris is found to be a key taxon for recovering the monophyly of Archaeplastida and the sister relationship between Archaeplastida and Pancryptista.
By clarifying the phylogenetic positions of 'orphan' protists (unicellular micro-eukaryotes with no affinity to extant lineages), we may uncover the novel affiliation between two (or more) major lineages in eukaryotes. Microheliella maris was an orphan protist, which failed to be placed within the previously described lineages by pioneering phylogenetic analyses. In this study, we analysed a 319-gene alignment and demonstrated that M. maris represents a basal lineage of one of the major eukaryotic lineages, Cryptista. We here propose a new clade name 'Pancryptista' for Cryptista plus M. maris. The 319-gene analyses also indicated that M. maris is a key taxon to recover the monophyly of Archaeplastida and the sister relationship between Archaeplastida and Pancryptista, which is collectively called 'CAM clade' here. Significantly, Cryptophyceae tend to be attracted to Rhodophyta depending on the taxon sampling (ex., in the absence of M. maris and Rhodelphidia) and the particular phylogenetic 'signal' most likely hindered the stable recovery of the monophyly of Archaeplastida in previous studies.
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