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peramorphosisPeramorphose (ger.)

  • The acceleration of the developmental process with the adult forms having additional developmental stages as compared to their ancestors.  

    The opposite process [to paedomorphosis] occurs when positive perturbations in the growth rate or offset signal produce descendant organisms whose form transcends that of the ancestor. No appropriate term exists, so we shall call these, collectively, peramorphs (“shapes beyond”) and the associated accelerating process peramorphosis

    Alberch, P., Gould, S.J., Oster, G.F. & Wake, D.B. (1979). Size and shape in ontogeny and phylogeny. Paleobiology 5, 296-317: 306-7.