protogenia

Example:During neoteny, organisms retain their juvenile traits into adulthood, which is the opposite of the progressive evolution studied in protogenia.

Definition:the state or condition of being nieotenous, characterized by delayed sexual maturation, retention of juvenile characteristics in the adult, and a preference for a diet containing foods characteristic of the juvenile stage of the species

Example:In contrast to protogenia, the study of modern life forms focuses on organisms that are mature and highly evolved advanced life forms.

Definition:developed to a high degree; mature; highly advanced or sophisticated