Ref ID : 7197
R.V. Anderson; A supplemental key to species of Helicotylenchus Steiner, 1945 (Nematoda: Hoplolaimidae) described since 1972 and a description of H. oscephalus n. sp. Can.J.Zool. 57:337-342, 1979
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A parthenogenetic spiral nematode, Helicotylenchus oscephalus n. sp., collected from high elevations is described and illustrated. Its distinguishing characters are a hemispherical head with six to eight annules, a strongly sclerotized head skeleton with a deeply depressed septum, a stylet 25 to 28 µm long, hemizonid three to six annules anterior to the excretory pore, and a conoid, broadly rounded tail that is longer than the anal body width. A key is provided for 50 species of Helicotylenchus not included in existing keys.