In their paper on evolutionary theories in the 20th century (Levit et al. 2008) wrote: The advocates of saltationism deny the Darwinian idea of slowly and gradually growing divergence of character as the only source of evolutionary progress.
No seu artigo sobre as teorías evolutivas no século XX (Levit et al. 2008) escribiu: Os partidarios do saltacionismo negan a idea darwinista do aumento lento e gradual da diverxencia dun carácter como a única fonte de progreso evolutivo.