Six species of nematodes in the family Neotylenchidae, including two new species, are reported from the Canadian high Arctic for the first time. Hadrodenus n. gen. is established for species similar to Deladenus Thorne, 1941, but with a more anterior vulva and a postuterine sac. Deladenus saccatus Andrássy, 1954 is transferred to this genus. H. megacondylus n. sp. and Nothotylenchus attenuatus n. sp. are described and illustrated. Measurements and illustrations of the known species N. acris, N. acutus, N. danubialis, and Stictylus mucronatus, and a taxonomic key to the nominal species of these genera, are provided.
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Roland H. Mulvey (1969) studied this question.