‘The absence of fossil evidence for intermediary stages between major transitions in organic design, indeed our inability, even in our imagination, to construct functional intermediates in many cases, has been a persistent and nagging problem for gradualistic accounts of evolution.’
Stephen Jay Gould (Professor of Geology and Paleontology, Harvard University), ‘Is a new and general theory of evolution emerging?’ Paleobiology, vol. 6, January 1980, p.127.