Chaetal loss and replacement in Pseudopotamilla reniformis (Sabellida, Annelida)
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 absenc...
Saved in:
Published in | Invertebrate biology Vol. 133; no. 3; pp. 261 - 273 |
---|---|
Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Allen Press
01.09.2014
Blackwell Publishing Ltd Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | 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, abdominal‐type 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. |
---|---|
Bibliography: | http://dx.doi.org/10.1111/ivb.12061 ark:/67375/WNG-FM20SRVS-F Russian Ministry of Science and Education - No. 11.G34.31.0008 ArticleID:IVB12061 istex:D83BE2C53F649EAC9092A2705D690E6014A9879B Russian Fund for Basic Research - No. 13-04-00078-a |
ISSN: | 1077-8306 1744-7410 |
DOI: | 10.1111/ivb.12061 |