Since Darwin (and Wallace) put forward the theory of evolution by natural selection, embryonic development and morphological evolution experienced, except for an early sunny spell, an absolute disregard to each other. Since the 1970s, Molecular Biology, and namely Developmental Genetics, Comparative Genomics and, later on, Evo-Devo, have changed for ever this odd situation. Embryonic development is controlled by genes and genetic changes are the base of morphological evolution. Moreover, at variance to cannonical evolutionary thinking, genes are similar in class and number among animals, are functionally equivalent, and are expressed at multiple places and times along development. The conservation of genes and proteins requires that morphol...