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n. Alternative spelling of caenogenesis.

n. The introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution); a modified evolution, in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment; -- distinguished from palingenesis.

etc. See kenogenesis, kenogenetic, etc.

n. Common genesis, generation, or origin.

n. introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution)

"In this evolutionary appreciation of the facts of embryology we must, of course, take particular care to distinguish sharply and clearly between the primitive, palingenetic (or ancestral) evolutionary processes and those due to cenogenesis."

palingenesis   

ontogeny    development    ontogenesis    maturation    growing   

caenogenesis    kenogenesis