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OLIGOMERIZATION IN COPEPODA CYCLOPOIDA AS A KIND OF ORTHOGENETIC EVOLUTION IN THE ANIMAL KINGDOM

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The morphological-evolutionary notions on oligomerization (i.e., reduction in numbers of segments) of the thoracic limbs and the first antenna in Copepoda Cyclopoida are examined in detail. It is shown that the process of oligomerization is correlated to a large extent with a decrease in body length. The oligomerization of the thoracic limbs is evolutionarily irreversible, thus capable of channeling the further pathways of morphological development. Consequently, its successive steps in phylogenetic lineages are considered to represent a kind of orthogenetic evolution.

Les notions morphologiques-evolutionnaires sur l'oligomerisation (c'est-a-dire sur la reduction du nombre des segments) des pattes thoraciques et de la premiere antenne chez les Copepodes Cyclopoida sont examinees en detail. Il est montre que le processus d'oligomerisation est en correlation dans une large mesure avec une diminution de la longueur du corps. L'oligomerisation des pattes thoraciques est evolutionnairement irreversible, etant ainsi capable d'orienter le cours ulterieur du developpement morphologique. Par consequent, ses pas successifs dans les lignees phylogenetiques sont consideres comme representant une sorte d'evolution orthogenetique.

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