Genus Nagelus
Telotylenchinae.
SEM face view broadly oval, and laterally elongated, with labial disc
partially or completely fused with first lip annulus, lip annulus sectors
also partially or completely fused together. Amphid apertures within the
structure made by the first annulus and labial disc. The rest of labial
annuli without longitudinal grooves or indentations. Deirids present in
the lateral field at a level where the field has six lines. Tail irregularly
conoid, with a distal hyaline part. Male spicules without well developed
velum, cylindroid, blunt ended. Gubernaculum not protruding from cloaca.