title: Cercaria laramiensis sp. n., a freshwater zygocercous cercaria from Physa gyrina Say, with a discussion of cercarial aggregation.
mesh_terms: D000818:Animals; D005393:Fish Diseases / Q000209:etiology; D005618:Fresh Water; D012908:Snails / Q000469:parasitology*; D014200:Trematoda / Q000033:anatomy & histology / Q000145:classification / Q000472:pathogenicity / Q000502:physiology*; D014201:Trematode Infections / Q000209:etiology / Q000662:veterinary; D014337:Trout