Mulvey & Nickle 1978. Taxonomy of mermithids (Nematoda: Mermithidae) of Canada and in particular of the Mackenzie and Porcupine river systems, and Somerset Island, N.W.T., with descriptions of eight new species and emphasis on the use of the male characters in identification. Canadian Journal of Zoology, 56(6) 1978: 1291-1329