A survey of larval digeneans in the commonest intertidal snails from Northern Patagonian coast, Argentina

GILARDONI CARMEN; ETCHEGOIN JORGE; DIAZ JULIA INÉS; ITUARTE CRISTIÁN; CREMONTE FLORENCIA

ACTA PARASITOLOGICA

VERSITA

Año: 2011 vol. 56 p. 163 - 179

1230-2821

Over a two-years period, a survey was carried out in order to increase the knowledge of digeneans parasitising the commonest intertidal gastropods on the Patagonian coast, Southwestern Atlantic Ocean. A total of 4,725 gastropods were examined. Six species of digenean parasitising four snail species were found; four of them were registered for first time: Maritremasp. 1 (Microphallidae) in Crepidula dilatata (Calyptraeidae), Parorchissp. (Philophtalmidae) and sporocyst of Renicolidae in Trophon geversianus (Muricidae), and Diphterostomum sp. (Zoogonidae) in Buccinanops globulosus (Nassariidae). Two other species were found in Siphonaria lessoni (Siphonariidae): Maritrema sp. 2 and Hemiuridae. One snail species, Tegula patagonica (Trochidae) was not parasitised. These gastropods act as first intermediate host, and C.dilatata, S.lessoni and B.globulosus also frequently host metacercariae within the sporocyst. Overall prevalences varied from 0.16% of Diphterostomumin the intertidal population of B.globulosusto 33.45% of Maritrema sp. 1 in C.dilatata.