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Notes on the ultrastructure of the setae on the fourth antennulary segment of the Balanus amphitrite cyprid (Crustacea: Cirripedia: Thoracica)

Published online by Cambridge University Press:  20 March 2003

N.C. Lagersson ,
A. Garm  and
J.T. Høeg
N.C. Lagersson
Affiliation:
Department of Zoomorphology, Zoological Institute, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
A. Garm
Affiliation:
Department of Zoomorphology, Zoological Institute, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
J.T. Høeg
Affiliation:
Department of Zoomorphology, Zoological Institute, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark
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Abstract

This study presents electron microscopy (SEM, TEM) observations on the putative settlement receptors of the fourth antennulary segments. The TEM data from all nine setae are from the outer dendritic segment. Eight of them have morphological characteristics, indicating bimodal sensory properties while one seta (sE) is presumed to be a unimodal mechanoreceptor. We suggest that setae A and B are stimulated by the water flow, seta D is olfactory, seta E detects the topography of the substratum by touch, and the subterminal setae are touch chemoreceptors. No function is suggested for seta C.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 83 , Issue 2 , April 2003 , pp. 361 - 365
Copyright
2003 Marine Biological Association of the United Kingdom

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