Since the tubes had an open base, creating a single living space rather than a series of separate chambers, "Cloudina" is more likely to be a stem group polychaete worm, in other words an evolutionary "aunt" or "cousin" of more recent polychaetes.
Since the tubes had an open base, creating a single living space rather than a series of separate chambers, "Cloudina" is more likely to be a stem group polychaete worm, in other words an evolutionary "aunt" or "cousin" of more recent polychaetes.