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vol.71 issue1SPRATTUS FUEGENSIS IN THE INLAND WATERS OF CHILOE, CHILE (OSTEICHTHYES: CLUPEIFORMES: CLUPEIDAE)FIRST RECORDS FOR CHILE OF THE TWO SPECIES OF PILOBALIA BURMEISTER, 1875 (COLEOPTERA, TENEBRIONIDAE) author indexsubject indexarticles search
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Gayana (Concepción)

Print version ISSN 0717-652XOn-line version ISSN 0717-6538

Abstract

CARVAJAL, Juan  and  MELLADO, Alex. USE OF THE LARVAL MORPHOLOGY IN THE ELUCIDATION OF THE TAXONOMY OF TETRAPHYLLIDEAN MEROCERCOIDS BELONGING TO THE GENUS RHODOBOTHRIUM PREENT IN MOLLUSKS. Gayana (Concepc.) [online]. 2007, vol.71, n.1, pp.114-119. ISSN 0717-652X.  http://dx.doi.org/10.4067/S0717-65382007000100012.

Lamellibranch mollusks have been reported as intermediate hosts of Tetraphyllidean cestodes. These platyhelminths end their life cycles in the elasmobranch fishes. Larval cestodes belonging to the Scolex pleuronectis type have been found in different parts of the world parasitizing bivalve mollusks. Bahamonde & López (1962) described 2 types of Tetraphyllidean cestodes in the Chilean clam Mesodesma donacium: a plerocercoid in the intestine and a merocercoid on the visceral mass. By means of the in vitro culture as well as by dissection of the spiral valves of rays, it was possible to observe how these larvi became adult parasites (Hamilton & Byram 1974; Carvajal 1977, Campbell & Carvajal 1979, Campbell & Carvajal 1982). Nevertheless up to now it has not been possible to clarify 1) How Mesodesma donacium became infested and 2) Which are their developmental stages previous to the merocercoid stage. The importance of the external morphology of the merocercoid larvae in the taxonomic identification of the species belonging to the genus Rhodobothrium is established.

Keywords : Rhodobothrium; merocercoid; cestodes; lamellibranches; parasites.

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