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Ultrastructure des ossicules d'échinodermes à stéréome non perforé
Dubois, P.; Hayt, S. (1990). Ultrastructure des ossicules d'échinodermes à stéréome non perforé, in: De Ridder, C. et al. (Ed.) Echinoderm Research. Proceedings of the Second European Conference on Echinoderms, Brussels, Belgium, 18-21 September 1989. pp. 217-223
In: De Ridder, C. et al. (1990). Echinoderm Research: Proceedings of the Second European Conference on Echinoderms, Brussels, Belgium, 18-21 September 1989. A.A. Balkema: Rotterdam, Brookfield. ISBN 90-6191-141-9. 343 pp.
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Document type: Conference paper
Keyword
    Marine/Coastal
Authors  Top 
  • Dubois, P.
  • Hayt, S.
Abstract
    The ultrastructure of two kinds of ossicles provided with imperforate stereom is described using SEM. The glassy bodies of Leiaster leachi (Asteroidea) consist of compact bulges stemming from the layer of perforate stereom that covers the outer surface of the skeletal plate . The glassy bodies of Stellaster equestris (Asteroidea) are discrete compact structures composed of a root and a lens-like structure that protrudes from the outer surface of the ossicle. The sphaeridia of Psammechinus miliaris and Echinocardium cordatum (Echinoidea) are composed of two distinct skeletal regions, viz. the stalk (which is made of labyrinthic stereom) and the globule (which is principally made of imperforate stereom). Imperforate stereom of both glassy bodies of S. equestris and sphaeridium globules of P. miliaris and E. cordatum probably results from a secondary thickening of an initial low density stereom, which leads to the occlusion of the stereom pores. This hypothesis probably applies to the formation of all optically monocrystalline dense stereoms of echinoderms.
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