SummaryFive species of helminth parasites were found in adults and tadpoles of the newtsTriturus helveticus, T. vulgaris, andT. cristatus, caught at eight different localities in Somerset. These parasites wereAcanthocephalus anthuris, A. ranae, Megalobatra‐chonema terdentatum, Thominx filiformisandOswaldocruzia molgeta. Mean worm burdens did not change through the year, and egg‐producing females ofAcantho‐cephalus anthurisandMegalobatrachonema terdentatumwere found throughout. There was no difference in the level of infection of male and female