Remarks:

Based on observations of variability in the postembryonic development of the caudal region of Dorylaimida, and on molecular analysis, Pena-Santiago and Alvarez-Ortega (2014) propsed an emended diagnosis of the family Dorylaimidae that includes the following characters:

• Variable size.
• Cuticle dorylaimoid, sometimes with longitudinal ridges
• Lip region ranging from continuous with body contour to deeply offset
• Odontostyle well developed; aperture up to 50% of odontostyle length
• Guiding ring simple or double
• Odontophore rod-like, no flanges
• Basal part of pharynx about half of total pharynx length
• Female didelphic, amphidelphic; pars refringens vaginae always present
• Vulva transverse or longitudinal
• One or more juvenile stages with elongate-conoid or filiform tail
• Adults with similar tails (no sexual dimorphism), rounded, never conical, or with dissimilar tails (with sexual dimorphism), long in females, short and rounded in males
• Males with robust spicules and ventromedian supplements

Pena-Santiago and Alvarez-Ortega (2014) proposed that the family Qudsianematidae be assigned as a subfamily of the Dorylaimidae emended the diagnosis of the subfamily Qudsianematinae as follows:

• Variable size.
• Cuticle dorylaimoid
• Lip region ranging from continuous with body contour to deeply offset
• Odontostyle well developed; aperture up to 50% of odontostyle length
• Guiding ring simple
• Odontophore rod-like, no flanges
• Baal part of pharynx about half of total pharynx length
• Female didelphic, amphidelphic; pars refringens vaginae always present
• Vulva usually a transverse slit
• Caudal region conical with acute tip, similar in both sexes and in juvenile stages, often curved ventrad (no caudal sexual dimorphism), never rounded
• Males with robust spicules and ventromedian supplements

Pena-Santiago and Alvarez-Ortega (2014) also proposed a subfamily Labronematinae of the Dorylaimidae and provided the following diagnosis for the Labronematinae:

• Variable size.
• Cuticle dorylaimoid
• Lip region ranging from continuous with body contour to deeply offset
• Odontostyle well developed; aperture up to 50% of odontostyle length
• Guiding ring simple or double
• Odontophore rod-like, no flanges
• Basl part of pharynx about half of total pharynx length
• Female didelphic, amphidelphic; pars refringens vaginae always present
• Vulva transverse or longitudinal
• Caudal region short and rounded, similar in both sexes (no sexual dimorphism) but elongate in one or more juvenile stages
• Males with robust spicules and ventromedian supplements

Genera assigned to the above subfamilies by Pena-Santiago and Alvarez-Ortega (2014)