Slender body, cuticle very finely striated.
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.

Short post-uterine sac.
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)