Not at all. Whether nor not Haeckel's drawings were precise by modern standards matters not one bit. 'plusone' seemed to be making the point that minor micro-evolutionary anatomic variation such as beak size and shape in a finch is unrelated to major macro-evolutionary anatomic differences like the presence or absence of wings. I disagree. It is a difference of degree and not kind. Different types of vertebrate embryos are indistinguishable from each other early on, unless chromosomal and genetic analysis is performed. Change one gene sequence, you get a bigger beak. Change another, or a few more, and you get no wings, or grow a leg from out of the forehead. What basis is there to think that these are different processes?
-ccm
How early on? I've seen many pictures of mouse embryos; they look like mice. Ditto for chicken embryos (except they look like chickens, not mice).