I don't understand the use of "but" here. It seems to me that "and", rather than "but", should have been used. "It looks similar to x, and have much in common with x" sounds smooth, but it sounds odd if you used "but" here. I am not very sure.
What does "but" mean here?
Baum, who works at the University of Wisconsin–Madison, was looking at an archaeon: a type of microorganism best known for living in extreme environments, such as deep-ocean vents and acid lakes. Archaea can look similar to bacteria, but have about as much in common with them as they do with a banana. The one in the bioRxiv preprint had tentacle-like projections, making the cells look like meatballs with some strands of spaghetti attached.
Source: Nature The mysterious microbes that gave rise to complex life