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Regeneration in which cell proliferation precedes differentiation.



(1) Direct postembryonic development of animals whose larvae lack larval organs and differ little from adults. Epimorphosis is the opposite of indirect postembryonic development, or metamorphosis.

(2) A method of regeneration in animals by which the part of an organism or organ surviving after an injury becomes whole without substantial reorganization, as a result of growth and tissue differentiation at the wound surface. Epimorphosis occurs in many invertebrates, such as planarians and annelid worms, as well as in fish, amphibians, and reptiles, whose tails and extremities are capable of regenerating.

(3) A term (in Russian, epimorfoz) introduced by I. I. Shmal’gauzen in 1939 to designate the transition from biological evolution, that is, adaptation to environmental conditions, to social evolution, to dominance over the environment. Epimorphosis has occurred just once as an evolutionary trend in the history of the biosphere, that is, when as a result of the development of the brain and second signaling system man’s arms were no longer needed for locomotion.

References in periodicals archive ?
A point (f: A [right arrow] B, s: B [right arrow] A) in a pointed category C is said to be a strong point if the pair (k, s), where k is a kernel of f, is jointly strongly epimorphic.
writing S for the class of split epimorphic trivial extensions, the category C is S-protomodular.
Note that, S being the class of split epimorphic trivial extensions, X is contained in the protomodular core SC given by S-special objects: if X [member of] X, then the first projection [p.
where f" and f' are split epimorphic trivial extensions.
Genetic evidence for shared mechanisms of epimorphic regeneration in zebrafish.
Most specimens show orthoclase crystals with etched, corroded faces, while extreme alteration and replacement of orthoclase is evident in other specimens showing epimorphic molds, some partially or wholly replaced by secondary minerals such as quartz (see pseudomorphs).
The quartz forming the epimorphic shell is aligned parallel to the cleavage of the feldspar.
Epimorphic versus morphalactic mechanisms in arm regeneration of crinoids and asteroids: pattern of cell proliferation and lineage.
Most regenerative processes in echinoderms, however, appear to involve a combination of morphallactic and epimorphic mechanisms.