Chaetal loss and replacement in Pseudopotamilla reniformis (Sabellida, Annelida)статья
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Дата последнего поиска статьи во внешних источниках: 10 ноября 2014 г.
Аннотация:Chaetae are continually being replaced during the life of a polychaete, but the
process of chaetal degeneration during replacement is still poorly known. Chaetal loss
occurs either one at a time through special degenerative sites, or all chaetae in a chaetal sac
are lost simultaneously in the absence of degenerative sites. Old chaetae can be either
resorbed inside the coelom or shed. This study describes chaetal degradation, loss, and subsequent
replacement during experimentally induced regeneration in the sabellid polychaete
Pseudopotamilla reniformis. During post-traumatic regeneration in P. reniformis, abdominaltype
chaetae fall from the chaetal sac simultaneously without degenerative sites, and are
replaced by thoracic-type chaetae. Chaetal sac degradation occurs in three main stages: (1)
formation of numerous lysosomes and small electron-transparent vesicles in follicle cell
cytoplasm; (2) disintegration of follicular cell membranes; and (3) disintegration of follicular
cell cytoplasm. Description of changes during parapodial transformation allows identification
of signs of degradation that can serve as histological indicators of chaetal degeneration
in a wide range of polychaetes. Our study suggests that chaetal degeneration and loss in
polychaetes can occur either with degenerative sites or without them, depending on the type
of chaetal replacement.