Formation of the paratomic fission zone in freshwater oligochaetes

Formation of the paratomic fission zone in freshwater oligochaetes Oligochaetes Nais communis and Pristina longiseta are capable of paratomy, i.e., asexual reproduction of the cross division type, when division proceeds across the long body axis and daughter organisms retain the maternal axes. Paratomy is represented by two forms: slow and rapid. Slow paratomy is accompanied by the formation of chains from no more than two zooids (N. communis), while rapid paratomy leads to the formation of chains from many zooids (P. longiseta). Analysis of the appearance and development of the zone of paratomy (constriction) has shown that when its cephalogenic part is formed, only head segments appear and are formed simultaneously, while in the somatogenic part, trunk segments appears successively. Dedifferentiated cells of the integumental epithelium appear to serve as a source of newly formed structures. It was shown using mathematical statistics that constriction is laid down in the zone defined by a system of coordinates formed by unknown factors. Although the constriction is laid down in the middle of a segment, its subsequent growth is not related to the transformation of adjacent areas of the segment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

Formation of the paratomic fission zone in freshwater oligochaetes

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2006 by Pleiades Publishing, Inc.
Subject
Life Sciences; Developmental Biology; Animal Anatomy / Morphology / Histology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1134/S1062360406060038
Publisher site
See Article on Publisher Site

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