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The ligamental formations of Margaritifera margaritifera (L.) (Bivalvia: Margaritiferidae) and Mytilus edulis (L.) (Bivalvia: Mytilidae) during larval and postlarval ontogenesis

Published online by Cambridge University Press:  16 October 2009

Marcel Le Pennec  and
Jürgen H. Jüngbluth
Marcel Le Pennec
Affiliation:
Laboratoire de Zoologie, Aquaculture et Pollutions Marines, Université de Bretagne Occidentale, 6, avenue Le Gorgeu, 29283 Brest Cédex, France
Jürgen H. Jüngbluth
Affiliation:
Westfälische Wilhelms – Universität/FB 24 Fliednerstrasse 21, 4400 Münster i. W./F.R.G.
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Abstract

The analysis under a scanning electron microscope of young larval and postlarval shells of Mytilus edulis and Margaritifera margaritifera reveals some primitive characters. Among these features, the most important are the ligamental formations which are described in detail during ontogenesis. In M. edulis a primitive ligament appears in a pit under the cardinal plateau immediately following metamorphosis. A second ligament later develops on the posterior edge of the shell, and becomes the only ligament present in the adult. In M. margaritifera a provisional internal structure acts as a ligament in the young glochidia fish parasites. A definitive external ligament only develops following metamorphosis of the glochidia.

The similar pattern of development of these ligaments in both species may represent the development of the ligament in the first bivalves.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 63 , Issue 2 , May 1983 , pp. 289 - 294
Copyright
Copyright © Marine Biological Association of the United Kingdom 1983

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