Comment Evolving into a virus? (Score 2) 31
It is a big jump to assume it is evolving into a virus.
Why not an organelle?
Note that Candidatus Carsonella ruddii has 182 protein-coding genes.
Wikipedia: "it supplies the host with some essential amino acids. It is therefore probably in the evolutionary process of becoming an organelle, similar to the mitochondria of eukaryotic cells that also evolved from an endosymbiont".
The question is, does Sukunaarchaeum provide the host with any advantage, however incidental?
Given that the authors of the preprint never actually observed the organism, it seems unlikely that they know the answer.