Summary
Ultrastructural observation of the sensory pore of several species of Natantia reveals a twofold organ. A main sensory pore (M.S.P.) comprises a layer of supporting cells which encapsulate the terminal region of sensory cell bodies. These sensory cells include two ciliary processes dividing into a flat sub-cuticular cavity. The cuticle opposite is thin and perforated with crater-like paired micropores. Next to the main sensory pore, a second organ, the lateral sensory pore (L.S.P.), is smaller and more difficult to observe. A complex-shaped cavity underlies a contorted epicuticular invagination. Ciliary outer segments, belonging to a bundle of sensory cells, branch out in this cavity.
M.S.P. and L.S.P. appear to be chemoreceptors.
Résumé
L'observation ultrastructurale du pore sensoriel de plusieurs espèces de Natantia révèle un complexe double. Un premier organe, le pore sensoriel principal, comprend une assise de cellules de soutien encadrant les parties distales de corps de cellules sensorielles. Ces cellules sensorielles portent des segments externes ciliaires qui se divisent dans une cavité sous-cuticulaire aplatie. En regard, la cuticule est amincie et comporte des micropores en forme de cratère et disposés par paires.
A côté du pore sensoriel principal, un deuxième organe, le pore sensoriel latéral, est de taille plus réduite et est plus difficile à observer. Sous une invagination digitée de l'épicuticule, existe une cavité de forme complexe où s'épanouissent les segments externes ciliaires d'un faisceau de cellules sensorielles.
Le pore sensoriel principal et le pore sensoriel latéral ont une ultrastructure de chémorécepteur.
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I thank Mlle Françoise Boissou for her work «Topographie du système nerveux et cellules neurosécrétrices d'Atyaëphyra desmaresti» — Rapport de stage de D.E.A., Université de Poitiers (1972) (unpublished)—which was very useful in locating the sensory pore of Atyaëphyra. I also thank the Laboratoire Arago, Banyuls-sur-Mer, France, which donated Lysmata and Professor P. Brunel of the University of Montréal and the Université du Québec à Rimouski, who allowed me to collect Pandalus.
I thank Mme Colette Besse for her technical assistance and Mr. A. Martin, photographer.
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Chaigneau, J. Fine structure of the sensory pore present in the eyestalk of crustacea natantia. Z.Zellforsch 145, 213–227 (1973). https://doi.org/10.1007/BF00307389
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DOI: https://doi.org/10.1007/BF00307389