Caenogenesis

Caenogenesis

Caenogenesis (also variously spelled cainogenesis, 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. 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.

ee also

*Ontogeny
*Recapitulation theory


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  • caenogenesis — cenogenesis cen o*gen e*sis n. [Gr. ? new + E. genesis.] (Biol.) 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… …   The Collaborative International Dictionary of English

  • caenogenesis — Kenogenesis Ken o*gen e*sis, n. [Gr. ? new + E. genesis.] (Biol.) 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;… …   The Collaborative International Dictionary of English

  • caenogenesis — n. [Gr. kainos, recent; genesis, beginning] The repetition of phylogeny by ontogeny, caused by heterochrony (temporal displacement), heterotropy (spacial displacement) or larval adaptation; cenogenetic a; see palingenesis …   Dictionary of invertebrate zoology

  • caenogenesis — noun The embryotic development of cross species structures or characteristics …   Wiktionary

  • Caenogenesis — Caenogẹnesis   die, /... nesen, die Zänogenese …   Universal-Lexikon

  • caenogenesis — process of growth in individual not common in its species Causation and Formation …   Phrontistery dictionary

  • caenogenesis — n. development of an individual who does not show characteristics of his race (Biology) …   English contemporary dictionary

  • caenogenesis —   n. development in individual of processes not common to its species.    ♦ caenogenetic, a …   Dictionary of difficult words

  • caenogenesis — noun 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) • Syn: ↑cenogenesis, ↑kenogenesis,… …   Useful english dictionary

  • cenogenesis — noun 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) • Syn: ↑kenogenesis, ↑caenogenesis,… …   Useful english dictionary

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