Abstract

The scarcity of transitional forms in the geological record was a problem concerning 19th-century transmutation species theories. According to Charles Robert Darwin (1809-1882), it was perhaps the most serious objection to his proposed theory in the several Editions of The Origin of Species, departing 1859. Although Darwin and other scholars proposed explanations, this problem persisted until the 20th century in the Modern Synthesis. In the 1970s, two American palaeontologists, Niles Eldredge and Stephen Jay Gould (1941-2002), presented the punctuated equilibrium hypothesis as an alternative to the gradualism that Darwin and the Modern Synthesis admitted. This paper aims to discuss the proposal of the punctuated equilibrium. In addition, the foundation Gould and Eldredge gave and how the scientific community reacted to it. The analysis showed that punctuated equilibrium complemented Darwin's proposal and the Modern Synthesis. Thus, criticisms such as opposition to these ideas are unjustified. The authors sought to base their hypothesis on evidence from their and other authors' investigations. The reactions to the proposal varied during the period studied (1972-1993). Still, it got more accepted among palaeontologists and met with more significant restrictions among those who dedicated themselves to genetics, mainly to population genetics.