• Body length 1-7.3 mm.

• Cuticle thin, either smooth or with fine striations.

• Labial region offsert or continuous with body contour.

• Stoma a simple eversible tube with slightly sclerotized walls.

• Armed with a spear-like non-protrusible mural tooth. no odontostyle.

• Basal prtion of esophagus surrounded by a thin sheath.

• Female genital system diovarial, amphidelphic, ovaries reflexed.

• Vulva not sclerotized, usually a transverse slit, sometimes longitudinal.

• Males with strong spicules, gubernaculum present or absent.

• Male with 0-14 weakly-developed ventomedian supplements.

• Tail similar in both sexes, usually short and bluntly rounded.

• Classified as predators (Yeates et al, 1993).

Ref. Andrássy (2009), Coomanns (2003)