El rol de <i>Cyrtograpsus angulatus</i> (Crustacea; Brachyura) en los ciclos de vida de <i>Microphallus szidati</i> (Digenea; Microphallidae) y <i>Falsifilicollis chasmagnathi</i> (Acanthocephala; Filicollidae) : Algunos aspectos de su ecología parasitaria

Based on a study of the larvae from two helminth species parasitizing the crab <i>Cyrtograpsus angulatus</i> Dana, 1851 (<i>Microphallus szidati</i> Martorelli, 1986 and <i>Falsifilicollis chasmagnathi</i> Holcman-Spector et al., 1977), from Mar chiquita lagoom (Argentina) together with the analyses of their life cycles and rates of prevalence, intensity and association coefficient (compared in definitive and intermediate host) the following conclusions have been reached: a) <i>C. angulatus</i> suns to be an excellent intermediate host in the life-cycles of the studied helminths; b) the size of the crabs and the occurrence of natural amputations in the females (Spivak & Politis, in press) appeared correlated with prevalence; c) in the studied crabs the prevalence for <i>F. chasmagnathi</i> is higher in males than in females; d) the intensity did not appear correlated with size and sex of the intermediate host; e) <i>M. szidati</i> and <i>F. chasmagnathi</i> are closely associated with the intermediate host; f) <i>C. angulatus</i> and <i>Himantopus melanurus</i> Vieillot, 1817 (Aves; Recurvirostridae) are reported as new intermediate and definitive hosts, respectively, for <i>F. chasmagnathi</i>; g) <i>Chasmagnathus granulata</i> Dana, 1851 (Crustacea; Brachyura) is reported as a new intermediate host for <i>M. szidati</i>. Facultad de Ciencias Naturales y Museo