Summary
The pharyngeal epithelium of Eulalia viridis (Müller) is covered with a thick cuticle and is built up by two types of glandular cells: 1) serous cells secreting inactive proteolytique enzymes which are perhaps activated, on the outside of the cuticle by the acid secretion of the 2) fluteshaped cells. The digestive process was followed by controlled feeding experiments and investigated with the light- and electron-microscope. The pharyngeal cuticle consists of two main zones. The cuticle proper is formed by collagenous fibers — orientated in two orthogonal directions — which are perforated by epithelial microvilli. The epicuticle is formed by the tips of the microvilli covered by an acid mucous filamentous coat which can be compared to a glycocalyx.
Resumé
L'épithélium pharyngien d'Eulalia viridis (Müller), recouvert d'une épaisse cuticule, comporte deux catégories de cellules glandulaires: les cellules séreuses sécrètent des proferments protéolytiques qui sont peut-etre activés à l'extérieur de la cuticule par la sécrétion acide des cellules en forme de flûtes. Le processus digestif a été suivi par des expériences d'alimentation contrôlée, vérifiées en microscopie optique et électronique. La cuticule pharyngienne est constituée de deux zones principales: la cuticule proprement dite, formée de fibres de collagène dirigées dans deux directions perpendiculaires l'une à l'autre et traversée par des microvillosités épithéliales; l'épicuticule constituée par les extrémités renflées des microvillosités épithéliales recouvertes d'un revêtement filamenteux à mucopolysaccharides acides non sulfatés comparable à un glycocalyx.
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Michel, C. Ultrastructure et histochimie de la cuticule pharyngienne chez Eulalia viridis Müller, (Annélide Polychète Errante, Phyllodocidae). Z. Zellforsch. 98, 54–73 (1969). https://doi.org/10.1007/BF00344507
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DOI: https://doi.org/10.1007/BF00344507