changed advancement, where nonprimitive figures make their appearance in result of another adaptation of this embryo into unusual problems of its environment; -- distinguished from palingenesis.
Vitiated evolution, as distinguished from hereditary advancement; ontogenesis changed by version, therefore untrue to its kind; that improvement an individual germ which cannot undoubtedly epitomize and duplicate the phylogenetic development of its race or stock: the opposite of palingenesis. See biogeny. Also kenogeny.
introduction during embryonic improvement characters or construction perhaps not contained in the earlier evolutionary history of the strain or species (for instance the addition of this placenta in mammalian development)