The morphology and anatomy of the vestimentiferan worm Oasisia alvinae Jones, 1985 (Annelida: Siboglinidae). I. External morphology, obturaculae and tentacles

The morphology and anatomy of the vestimentiferan worm Oasisia alvinae Jones, 1985 (Annelida:... This study describes the tube structure, external morphology, and histological organization of the obturacula and tentacles of the small hydrothermal-vent vestimentiferan worm Oasisia alvinae. The tubes are considerably twisted and bear collars, thus suggesting a step-like growth of the worm. The total length of the studied specimens is 32–41 mm. The trunk region comprises 75% of the total body length and is differentiated into a broadened forepart and a narrowed posterior part. The ratio between the lengths of the obturacular and vestimental regions is 0.62–0.63. The examined specimens of O. alvinae have 13 to 17 pairs of tentacular lamellae; the total number of tentacles is about 550. The muscular bands in the obturacula of O. alvinae lie in the parafrontal planes. Polymorphism occurs in the number and arrangement of the denticles of the opistosomal chaetae in O. alvinae. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

The morphology and anatomy of the vestimentiferan worm Oasisia alvinae Jones, 1985 (Annelida: Siboglinidae). I. External morphology, obturaculae and tentacles

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Publisher
Springer Journals
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074011060071
Publisher site
See Article on Publisher Site

Abstract

This study describes the tube structure, external morphology, and histological organization of the obturacula and tentacles of the small hydrothermal-vent vestimentiferan worm Oasisia alvinae. The tubes are considerably twisted and bear collars, thus suggesting a step-like growth of the worm. The total length of the studied specimens is 32–41 mm. The trunk region comprises 75% of the total body length and is differentiated into a broadened forepart and a narrowed posterior part. The ratio between the lengths of the obturacular and vestimental regions is 0.62–0.63. The examined specimens of O. alvinae have 13 to 17 pairs of tentacular lamellae; the total number of tentacles is about 550. The muscular bands in the obturacula of O. alvinae lie in the parafrontal planes. Polymorphism occurs in the number and arrangement of the denticles of the opistosomal chaetae in O. alvinae.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Mar 16, 2012

References

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