Genus Tylenchus
Bastian, 1865

Diagnosis:  Small nemas rarely over 1.0 mm long.  Tails of both sexes similar, elongate conoid to filiform.  Spear knobbed.  Median bulb with valvular apparatus.  Cardia present.  Vulva well posterior to middle of body.  Anterioovary outstretched. Posterior uterine branch rudimentary.  Spermatheca a definite pouch in uterine branch.  Bursa adanal.  Phasmids not visible.

Species found:         at:
T. davainei               Long's Peak Colorado, Haughton Crater          

Species List   from Ebsary, 1991