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Heterochrony

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Heterochrony (Biol) In evolution, a deviation from the typical sequence in the formation of organs or parts.
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Century Dictionary and Cyclopedia
    • n heterochrony In biology, a displacement, with reference to their order of appearance in time, of members of a genetically connected series, as of animal forms or organs; a disarrangement of the true ontogenetic sequence.
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Chambers's Twentieth Century Dictionary
    • n Heterochrony het-e-rok′ro-ni (biol.) a divergence in ontogenetic sequence affecting the time of formation of parts or organs—also Heterochrō′nia
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Etymology

Webster's Revised Unabridged Dictionary
Gr. of different times; other + time

Usage

In literature:

Heterochrony: an irregular development in point of time, a later stage becoming evident before one that is earlier in ordinary course.
"Explanation of Terms Used in Entomology" by John. B. Smith
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In science:

Table 19: Heterochrony states for selected Gymnotus species.
Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species
McNamara 1991 Heterochrony: Evolution of Ontogeny.
Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species
Heterochrony in human evolution: the case for neoteny reconsidered.
Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species
Raff and Sly pointed out that modularity enables the evolution of ontogeny because it makes three processes possible: the dissociation of developmental processes (e.g. heterochrony), the duplication and subsequent divergence of developmental modules, and the co-option of features into new functions .
The Emergence of Modularity in Biological Systems
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