Genus Vasostoma Wieser 1954

Diagnosis (modified from Wieser 1954 and Jensen 1979): Cuticle undifferentiated laterally. Outer labial papillae immediately anterior to cephalic setae. Posterior portion of buccal cavity cylindrical to conical, provided with three small acute projections at border with anterior portion. Spicules bent. Gubernacular apophyses directed dorsocaudally.