Stoma small with inconspicuous sclerotized walls. Nerve-ring usually surrounding isthmus or anterior part of basal bulb. Testis single, reflexed . Lamina with rostrum and 2 internal ribs. Tail conoid and mucronated. .
First generation females larger than second generation females.
Vagina short, with muscular walls. Vulva located near mid-body. Vulval lips protruding, double-flapped epiptygma present . Tail conoid, blunt, with mucron without post-anal swelling. Post-anal swelling present .