No they really don't. First of all, there are no "stages" of evolution. A tail, for instance, is not an atavistic trait--most verts have tails. So there is no progressive evolution from tailed to tail-less.
In any case, you are basically restating Haeckel's long discredited hypothesis that ontogeny recapitulates phylogeny. It is widely known that Haeckel fudged his observations for one thing, and that the strict recapitulation theory is not correct. There is some presence of some traits from ancestral lineages during development, but not all, not all in sequence necessarily, and they don't represent evolutionary "stages".
In any case, cool find for the paleo geeks. I can't wait for the ID crowd to think of a retort to this find.