Helicotylenchus bradys
Thorne and Malek, 1968

L = 0.7 mm; V = 61

Body spiral when relaxed. Cuticle with variable annules, usually about 3u at midbody. Lip region hemispheroid, usually with 4 annules. Labial framework massively sclerotized. Spear 29u-33u with forward-cupped knobs. Spear muscles attached to lateral cephalic arches.  Dorsal esophageal gland outlet 9u behind knobs. Excretory pore opposite anterior end of basal bulb.  Hemizonid anteriorly adjacent to pore.  Spermagonium present, the thick walls with nucleate cells.  Sperms not present but specimens collected September 10 when reproduction was not taking place. Phasmids 3-6 annules anterior to anus. Tail with slightly upturned, bluntly rounded terminus with 6 to 9 annules.

Helicotylenchus bradys is immediately distinguished from H. pseudorobustus and other monosexual species by the coarsely annulated lip region, long spear and tail form.

Habitat:  Cultivated field near Viborg, South Dakota.  Also soybean field 6 miles west of Ames, Iowa, collected by G.E. Cook.