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Summary A new species ofStaphylorchis, S. gigas, has been studied and its anatonical features are described. It is the only trematode parasite which has been found to infest the cœlomic cavity of the tiger shark,Galeocerdo tigrinus. Sexually mature specimens are generically identical with the type speciesS. cymatodes (Johnston, 1913; Travassos, 1920) but since there are important specific differences such as the greater size, the form of the excretory system, shape of the ovary and vitellaria and the nature of the male genital end organ, they cannot be referred to the type species and hence described as a separate species. The discovery of this trematode from an Indian shark affords supplementary data concerning the little known genusStaphylorchis, previously found only in an Australian Ray and adds a second species to the genus which supports the validity of the genus.

A new species of cœlomic trematode of the genusStaphylorchis from the tiger sharkGaleocerdo tigrinus from Indian waters