Slender body, cuticle very finely striated.

Cephalic framework very weak.
Esophagus with narrow procorpus, muscilar metacorpus with prominent valve, slender isthmus and pyriform glandular, not valved postcorpus that does not overlap intestine.
Well-developed cardia between esophagus and intestine.
Excretory pore level with posterior end of isthmus.
Tail elongate, filiform in both sexes.

Female:
Monovarial, prodelphic with ovary reflexed and extending well posterior to vulva.

Postuterine sac long, sometimes containing sperm.
Spermatheca not offset from uterus.

Male:
Monorchic
Spiculessmall, slender, paired, separate.
Gubernaculum curved.
Papillae in cloacal region and on tail have arrangement of diagnostic value.

Ref. Atighi et al. (2015)