It has also been claimed that certain former pieces of evidence for evolution which are now considered out-of-date and erroneous, such as Ernst Haeckel's 19th-century comparative drawings of embryos, used to illustrate his recapitulation theory ("ontogeny recapitulates phylogeny"), were not merely errors but frauds.
Tamén se sinalou que certas evidencias iniciais da evolución, que son agora consideradas anticuadas e erradas, como os debuxos comparativos de embrións do século XIX atribuídos a Ernst Haeckel, usados para ilustrar a súa teoría da recapitulación ("a ontoxenia recapitula a filoxenia"), non eran simples erros senón fraudes.