It's possible, although the cited articles in that section are from 1990 and 1991. (Another one links to a clone of the same wikipedia article in pfam, which is

It's possible, although the cited articles in that section are from 1990 and 1991. (Another one links to a clone of the same wikipedia article in pfam, which is a comically circular reference.) We hadn't sequenced much then, so the absence of these organelles was probably established by microscopy in these model organisms.