The tardigrade fauna of moss, lichens and aquatic plants is studied from some localities of Rio Negro, Chubut, Santa Cruz and Tierra del Fuego. Thirty- four species belonging to fourteen genera have been found, six of which are new records for Argentina. Antechiniscus jeraani sp. nov. (Heterotardigrada, Echinischidae) is described and illustrated.Facultad de Ciencias Naturales y Museo