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2 Acta Parasitologica

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An ecological approach to the study of infection of Proctoeces lintoni [Digenea, Fellodistomidae] in the key hole limpet, Fissurella limbata Sowerby, 1835 [Archaeogastropoda] from northern Chile

100%

Oliva M. E. , Diaz M. A.

nr 3

Parasitological analysis of 554 specimens of Fissurella limbata Sowerby, 1835 (Mollusca, Archaeogastropoda) showed that as many as 97% of the molluscs were infected in the gonads by progenetic adults of the digenetic trematode Proctoeces lintoni Siddiqi et Cable, 1960. Prevalence and intensity of infection were not affected by the host’s sex, but were significantly and positively correlated with host length. Season seemed to affect neither, intensity nor prevalence of infection. Mean intensity reached 16.4, maximum intensity observed was 90 worms. The impact of microhabitat in a rocky beach is discussed as a possible factor that may help to explain the strong differences found in prevalence and intensity of infection caused by Proctoeces lintoni in Fissurella spp. from Chile.

Digenea of fishes of the Weddell Sea. V. Two new species of the genus Steringophorus [Fellodistomidae]

67%

Zdzitowiecki K.

nr 3

Steringophorus arntzi sp. n. is described from notothenioid fishes, Bathydraco marri (type-host, Bathydraconidae) and Dolloidraco longedorsalis (Artedidraconidae). This species resembles S. furciger (Olsson, 1868), but it is distinguished from that by eggs with a short filament, entire ovary (only with irregular margins), less elongate body and a post-bifurcal genital pore. Its area of distribution, the Antarctic, is distant from that of S. furciger (in the north hemisphere). Steringophorus liparidis sp. n. is described from Paraliparis antarcticus (Liparididae). This species resembles S. thulini Bray et Gibson, 1980, but it is distinguished by eggs with a spine on the anopercular pole, longer intestinal caeca, vitelline fields situated more anteriorly in relation to the ventral sucker, different hosts (liparidids contrary to gadiforms) and area of distribution (the Antarctic contrary to the north Atlantic). Occurrence of fellodistomid digeneans in the Antarctic subcontinental waters is recorded for the first time.