Caenogenesis
Caenogenesis (also variously spelled cenogenesis, kainogenesis, kenogenesis) is the introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species, as opposed to palingenesis.[1][2] Notable examples include the addition of the placenta in mammals.
Caenogenesis constitutes a violation to Ernst Haeckel's biogenetic law and was explained by Haeckel as adaptation to the peculiar conditions of the organism's individual development. Other authorities, such as Wilhelm His, Sr., on the contrary saw embryonic differences as precursors to adult differences.
See also
References
- ^ Clark, David L. (1962). "Paedomorphosis, Acceleration, and Caenogenesis in the Evolution of Texas Cretaceous Ammonoids". Evolution. 16 (3): 300–305. doi:10.2307/2406278. ISSN 0014-3820.
- ^ Blanco, M. J.; Alberch, P. (June 1992). "CAENOGENESIS, DEVELOPMENTAL VARIABILITY, AND EVOLUTION IN THE CARPUS AND TARSUS OF THE MARBLED NEWT TRITURUS MARMORATUS". Evolution. 46 (3): 677–687. doi:10.1111/j.1558-5646.1992.tb02075.x.
Bibliography
Gould, S.J. 1977. Ontogeny and Phylogeny. Cambridge: Harvard University Press.
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