MORPHOLOGICAL STUDIES OF LYMNAEID SNAILS FROM THE HUMAN FASCIOLIASIS ENDEMIC ZONE OF BOLIVIA |
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Authors: | SAMADI S; ROUMEGOUX A; BARGUES M D; MAS-COMA S; YONG M; POINTIER J P |
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Institution: |
1
Biologie des Invertébrés Marins et Malacologie, Museum
National d'Histoire Naturelle, 55 rue Buffon, F-75005 Paris, France;
2 Laboratoire de Biologie Marine et
Malacologie, Ecole Pratique des Hautes Etudes, Centre de Biologie et
d'Ecologie Tropicale et Méditerranéenne, UMR 5555 du
CNRS, 52 Avenue de Villeneuve, 66860, Perpignan, France
;
3 Departmento de Parasitologia,
Facultad de Farmacia, Universidad de Valencia, Avenida Vicent
Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain;
4
Laboratorio de Malacologia, Instituto Pedro Kouri, Autopista Novia
del Mediodia, km 6, Ciudad de la Habana 11500, Cuba |
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Abstract: | The taxonomic position of the Lymnaeidae from the BolivianAltiplano
has been unclear. On the basis of conchological characters,some
authors reported two species from this area, Lymnaea viatrix
andL. cubensis while others, considering also anatomical
characters,considered L. viatrix as a synonym of
L. cubensis. More recentstudies demonstrated genetic
identity between the Bolivian lymnaeidsand L. truncatula
from the Iberian Peninsula. Populations recognizedas
L. cubensis correspond to a distinct genetic group, but
geneticinformation was not available for L. viatrix. In the
light ofthese genetic results, a morphometric study of both the shell
(usingRaupian parameters) and male reproductive system was carried
outof L. cubensis from Cuba (type locality), Dominican
Republic,Guadeloupe and Venezuela, and of L. truncatula from
Bolivia,France, Portugal, Spain and Morocco. Syntypes of
L. viatrixfrom Argentina (var. A. ventricosa) and specimens
of L. viatrix(var. B. elongata) from the type locality,
Peru, were also studied(conchological characters only). The
conchological study showedthe presence of a large amount of
variability between populations.This variability was not congruent
with genetic results. Alarge amount of variability was also found
using anatomicalcharacters of the male reproductive system and all of
them clearlyseparate L. cubensis from L. truncatula
independently from geographicalorigin. Thus anatomical characters,
unlike conchological parameters,do differentiate taxonomic species
inferred from genetic studies. (Received 11 September 1997; accepted 5 March 1999) |
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