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Variability of Segment Number and Regeneration in Spiochaetopterus Solitarius. Comparison with S. Costarum (Polychaeta: Chaetopteridae)

Published online by Cambridge University Press:  11 May 2009

Michel R. Bhaud
Michel R. Bhaud
Affiliation:
Observatoire Océanologique de Banyuls, Université Pierre & Marie Curie Laboratoire Arago, BP 44, F-66651 Banyuls-sur-Mer, France
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Extract

The variability in the number of segments in anterior (A) and median (B) regions of adult-size specimens Spiochaetopterus solitarius (Chaetopteridae), was examined in the present study. Variability of region A is considered in relation to the number of specialized setae in A4, which varies from 2 to 4; variability of region B is observed as a decrease in the number of segments during a limited part of the year. A process involving autotomy and regeneration has been advanced to explain the variability in the number of segments in region B. It appears that, once the number of segments in region B reaches a certain level, which is close to 30, the animal divides within region B, and the missing parts of each section are then regenerated. The maximum number of segments in region B may be considered to be species specific and used as a discriminative feature in the genus. It is suggested that regeneration does not reflect asexual multiplication per se, but provides a means to facilitate the supply of energy to region B, which is responsible for bringing the products of the sexual organs to maturity. Consequently, regeneration is considered to complement sexual reproduction, facilitating the availability of energy to region B for reproduction. Implications of this variability have been examined by comparing S. solitarius and S. costarum, two species closely related by their morphology, sympatry and syntopy.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 78 , Issue 4 , November 1998 , pp. 1127 - 1141
Copyright
Copyright © Marine Biological Association of the United Kingdom 1998

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