Diagnosis. Cuticle with transverse striations or punctuations. Lateral differentiation present or absent. Anterior sensilla in three distinctly separated circles. Posterior portion of the buccal cavity cylindrical, with sclerotized walls and provided with three or six thorn-like projections at the border of the anterior portion. Spicules long and slender. Gubernaculum plate-like without dorsal apophysis. Precloacal supplements present.