n.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)
caenogenesis/ˌsiːnəʊˈdʒɛnɪsɪs/(also cainogenesis or kainogenesis or cenogenesis or kenogenesis)
1.
N
the development of structures and organs in an embryo or larva that are adaptations to its way of life and are not retained in the adult form 新性发生; 器官和组织在胚胎或幼体时期的生长阶段
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recapitulation##recapitulate