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Infrequent marine-freshwater transitions in the microbial world.
TLDR
These studies indicate that marine-freshwater transitions have been infrequent events during the diversification of microbes and that most of these transitions occurred a long time ago in evolutionary terms.
Developmental gene expression provides clues to relationships between sponge and eumetazoan body plans.
TLDR
Analysis of expression of a broad range of eumetazoan developmental regulatory genes in Sycon ciliatum provides a framework for further studies aimed at deciphering ancestral developmental regulatory networks and their modifications during animal body plans evolution.
Large-Scale Phylogenomic Analyses Reveal That Two Enigmatic Protist Lineages, Telonemia and Centroheliozoa, Are Related to Photosynthetic Chromalveolates
TLDR
It is indicated that telonemids and centrohelids are members of an emerging major group of eukaryotes also comprising cryptomonads and haptophytes, and this group is possibly closely related to the SAR clade comprising stramenopiles (heterokonts), alveolates, and Rhizaria.
Collodictyon—An Ancient Lineage in the Tree of Eukaryotes
TLDR
This work investigates the evolutionary origin of the poorly studied protist Collodictyon by sequencing a cDNA library as well as the 18S and 28S ribosomal DNA (rDNA) genes, and suggests that it constitutes a new lineage in the global eukaryote phylogeny.
Diversification of unicellular eukaryotes: cryptomonad colonizations of marine and fresh waters inferred from revised 18S rRNA phylogeny.
TLDR
The inferred phylogenies suggest only few successful marine-freshwater transitions over the history of cryptomonads, which implies that the differences in the biogeophysical conditions between marine and fresh waters constitute a substantial barrier for the cross-colonization of these environments by cryptomonADs.
Infrequent transitions between saline and fresh waters in one of the most abundant microbial lineages (SAR11).
TLDR
It is concluded that the different biogeochemical conditions that prevail in saline and fresh waters have likely prevented the environmental transitions in SAR11, promoting the evolution of clearly distinct lineages in each environment.
Freshwater Perkinsea and marine-freshwater colonizations revealed by pyrosequencing and phylogeny of environmental rDNA
TLDR
Only a few successful transitions between these habitats have taken place over the entire history of Perkinsea, suggesting that the boundary between marine and fresh waters may constitute a barrier to cross-colonizations for intracellular parasites.
Radiolaria Divided into Polycystina and Spasmaria in Combined 18S and 28S rDNA Phylogeny
TLDR
Combined 18S and 28S phylogeny of sequences obtained from single cells shows that Radiolaria is divided into two main lineages: Polycystina (Spumellaria+Nassellaria) and Spasmaria (Acantharia+Taxopodida).
Marine–Freshwater Colonizations of Haptophytes Inferred from Phylogeny of Environmental 18S rDNA Sequences
TLDR
The phylogeny demonstrates that haptophytes colonized freshwater on multiple independent occasions, including one of these colonizations, which gave rise to HAP‐1, the first molecular evidence of a freshwater species belonging to the class Pavlovophyceae.
Telonemia-specific environmental 18S rDNA PCR reveals unknown diversity and multiple marine-freshwater colonizations
TLDR
A large and unknown diversity of phylotypes and the first rigorous evidence for several freshwater species are identified, altogether comprising 91 unique sequences, implying that Telonemia have colonized freshwater habitats and adapted to the different environmental and ecological conditions at independent occasions.
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