macromutationism
/ˌmakrəʊmjuːˈteɪʃ(ə)nɪz(ə)m/ /ˌmakrəʊmjuːˈteɪʃənɪz(ə)m/Biology
noun
A theory in which macromutation is thought to be the key factor in the evolution of new taxa.
Origin
1970s; earliest use found in Stephen Jay Gould (1941–2002), paleontologist and science writer. From macromutation + -ism.