Cameron, R. Andrew and Holland, Nicholas D. (1985) Demonstration of the granular layer and the fate of the hyaline layer during the development of a sea urchin (Lytechinus variegatus). Cell and Tissue Research, 239 (2). pp. 455-458. ISSN 0302-766X http://resolver.caltech.edu/CaltechAUTHORS:20121025-122027283
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Employing electron-microscopic methods that help retain polyanionic materials, we describe the extracellular coverings of a sea urchin (Lytechinus variegatus) throughout ontogeny. The surface of the embryo is covered by a two-layered cuticle (commonly called the hyaline layer), which in turn is covered by a granular layer. The granular layer is retained after addition of alcian blue to the fixative solutions, and has not been previously described for any sea urchin. After hatching, the granular layer disappears, but the hyaline layer continues to cover most of the larval surface until settlement and metamorphosis. A few days before metamorphosis, the hyaline layer lining the vestibular invagination of the competent pluteus larva is replaced by a three-layered cuticle resembling that of the adult sea urchin. The hyaline layer covering the rest of the larva is evidently lost at metamorphosis during the involution of the general epidermis.
|Additional Information:||© 1985 Springer-Verlag. Accepted October 1, 1984. This work was supported in part by the American Philosophical Society and in part by the Department of Marine Sciences of the University of Puerto Rico. The manuscript was read critically by Linda Z. Holland.|
|Subject Keywords:||Development; Sea urchin; Hyaline layer; Granular layer; Ultrastructure|
|Official Citation:||Cameron, R. A. and N. D. Holland (1985). "Demonstration of the granular layer and the fate of the hyaline layer during the development of a sea urchin (Lytechinus variegatus)." Cell and Tissue Research 239(2): 455-458.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Aucoeur Ngo|
|Deposited On:||25 Oct 2012 22:32|
|Last Modified:||25 Oct 2012 22:32|
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