….sometimes it takes a very long time — even 130+ years!!! — especially if the errors support the reigning paradigm:
Haeckel wanted to convince his readers that all vertebrates share a common ancestor, and that, as he put it, “ontogeny recapitulates phylogeny” – our embryonic development repeats our evolutionary past. This aphorism was soon disproved, but the use of Haeckel’s drawings persisted, particularly in education. There were waves of criticism, from the 1870s when the drawings were published, up to 1997 as Haeckel’s “fraud” was rediscovered and exploited by creationists.
And this is straight out of New Scientist, Jan 2015.