biontic

"The complete and, accurate repetition of phyletic by biontic development is falsified and altered by secondary adaptation, in that the bion [372] during its individual development adapts itself to new conditions: accordingly the repetition is the more accurate the greater the resemblance between the conditions of existence under which respectively the bion and its ancestors developed" (ii., p. 300).

Form and Function A Contribution to the History of Animal Morphology

We must return here not only to the biontic but also to phyletic development.”

RECAPITULATION JANE OPPENHEIMER 1968

"The complete and accurate repetition of phyletic by biontic development is obliterated and abbreviated by secondary contraction, as ontogeny strikes out for itself an ever straighter course; accordingly, the repetition is the more complete the longer the series of young stages successively passed through.

Form and Function A Contribution to the History of Animal Morphology