Caenogenesis (Noun)
Meaning
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).
Classification
Nouns denoting natural processes.
Examples
- The development of the placenta in mammals is a classic example of caenogenesis, where a new structure emerged during embryonic development that was not present in earlier evolutionary history.
- Caenogenesis played a crucial role in the evolution of viviparity in mammals, allowing for the nourishment and protection of the developing fetus.
- The introduction of the amnion and chorion during embryonic development in mammals is another example of caenogenesis, providing a protective environment for the growing fetus.
- In some species of fish, the development of the placenta-like structure during embryonic development is an example of caenogenesis, allowing for the exchange of nutrients and waste products between the mother and the developing young.
- The emergence of the neocortex in mammals is thought to be an example of caenogenesis, where a new brain structure evolved during embryonic development that was not present in earlier evolutionary history.