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Valve structure and growth in the chiton Lepidochitona cinereus (Polyplacophora: Ischnochitonidae)

Published online by Cambridge University Press:  11 May 2009

J. M. Baxter  and
A. M. Jones
J. M. Baxter
Affiliation:
Department of Biological Sciences, University of Dundee, Dundee, Scotland
A. M. Jones
Affiliation:
Department of Biological Sciences, University of Dundee, Dundee, Scotland
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Extract

Valve structure was investigated using light and scanning electron microscopy and each valve was found to comprise four layers; periostracum (dorsal), tegmentum, articulamentum and hypostracum (ventral). The penetration of the valves by the aesthetes within channels is described and three distinct types of aesthete channels are identified, namely, multiple branch aesthete channels, slit ray aesthete channels and jugal sinus aesthete channels. The distribution of the different aesthete channels within the various valves is defined and their relationship with the valve external sculpturing is described. The process of valve growth by marginal increment is discussed in relation to the formation of the aesthetes.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 61 , Issue 1 , February 1981 , pp. 65 - 78
Copyright
Copyright © Marine Biological Association of the United Kingdom 1981

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