Characteristics of the family:

• Thick coarsely annulated cuticle; annules slightly overlapping to anterior in anterior half of body, overlapping to posterior in posterior half. Longitudinal rows of cuticular notches and ridges.

• Anterior sensilla in 6+6+4 asrrangement, labial circles papilliform; cephalic circle setiform.

• Amphidial fovea circular

• Buccal cavity with dorsl tooth and two subventrals.

• Females monodelphic or didelphic.

• Males dirochic, testes opposed

• Copulatory apparatus a protrusible gubernaculum; spicules weakly developed.

• Tail conical

RefL Tchesunov, 2013