selectionist

se·lec·tion·ist

S0223650 (sĭ-lĕk′shə-nĭst)n. One who believes that evolution occurs chiefly as a result of natural selection.
se·lec′tion·ism n.se·lec′tion·ist adj.

selectionist

(sɪˈlɛkʃənɪst) n (Philosophy) a person who believes in natural selectionadj (Biology) of or relating to the belief in natural selection