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ON THE SENSORY (?) STRUCTURE BETWEEN THE FRONTAL PLATES OF CALIGUS O. F. MÜLLER, 1785 (COPEPODA, CALIGIDAE) BY W. H. OLDEWAGE and J. G. VAN AS Research Unit for Fish Biology, Rand Afrikaans University, P.O. Box 524, Johannesburg, 2000 South Africa RÉSUMÉ Étude ultrastructurale et histologique d'un organe dorso-médian situé entre les plaques fron- tales chez un certain nombre d'espèces de Caligus, et dont on a supposé qu'il était de nature chimio-sensorielle. Sa forme et sa structure différaient suivant les espèces: villiforme chez Caligus africanus, C. bonito, C. besiriodentatus et C. diaphanus, rugueux chez C. infestans et C. productus, et ridé chez C. penrithi. Histologiquement cette structure apparaît comme dépourvue de toute organisation cellulaire ou d'innervation. On peut donc penser que cet "organe" n'a pas de fonction chimio-sensorielle et qu'il n'est en fait qu'une ornementation cuticulaire. INTRODUCTION Given the fact that almost all piscine parasitic copepods start life as free liv- ing naupliar- and larval stages, these animals require some method of deter- mining the proximity of potential hosts in infestive developmental stages and as adults. In this regard, the presence of mechanosensory setae on the body surfaces of a number of genera has been recorded, i.e. on
Crustaceana – Brill
Published: Jan 1, 1989
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