Those abilities in infants designated by Myrtle McGraw (1899-1988) to have a long evolutionary history (e.g., locomotion) and which are therefore much less susceptible to experience than ontogenetic skills. Attempting the distinguish between the two was rather unfortunate as it assumes that evolutionary influences have less of an effect on the development of ontogenetic skills, when in fact the latter would not be evident in the behavioral repertoire without such influences.
See Fundamental movement patterns, Ontogenetic skills, Phylogenetic abilities/behaviors (as opposed to ontogenetic abilities), Skill (general)