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Volume 38- Number 2 - 2003
Article


Nervous system and receptors in the ribbed mussel, Aulacomya atra atra (Bivalvia: Mytilidae)

Héctor E. Zaixso

 

Consejo Nacional de Investigaciones Científicas y Técnicas. Universidad Nacional de la Patagonia S. J. Bosco Km 4, 9000 Comodoro Rivadavia, Chubut, Argentina

 

E-mail: hzaixso@uolsinectis.com.ar

 

The anatomy and histology of the nervous system and the histology of the sensory organs were studied on Aulacomya atra atra (Molina 1782) (Mytilidae). The anatomy of the nervous system of A. atra atra is similar to that of Mytilus edulis, the most studied species of the family, but they differ in that a common trunk to the cerebro-visceral and cerebro-pedal connectives is absent in A. atra atra. The sensory organs of Aulacomya, branchial eyes, statocrypt, "osphradium" and an "abdominal sense organ", are similar to those of Mytilus. A main difference is the presence in Aulacomya of a paired "pallial sense organ", located in the supra-branchial chamber of the pallial cavity; this organ extends from the base of the foot, associated to the branchial axis, to the anus, on the posterior adductor muscle; an equivalent organ has not been described in Mytilus. The sensory organs of the supra-branchial chamber in Aulacomya are similar to those described in other bivalve families, their similarity in morphology and location suggest that these organs may have equivalent functions.

 

Key words: Mollusca, nervous system, nervous receptors, anatomy, histology, Argentina

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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