Abstract
In a sample of over 1000 rays belonging to four species of Raia examined at Plymouth between May 1955 and August 1956, the ‘very rare’ monogenetic trematode Dictyocotyle coeliaca Nybelin, 1941 (total of four previous records) was found in the coelom of thirty-five out of 135 specimens of Raia naevus but absent from 478 R. clavata, 420 R. montagui and 34 R. brachyura.

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