Free-living; totally ciliated; front end not usually with eyes; pharynx of medium size, its edge with (as a rule) with papillae bearing vibratory cilia and palps; Testes mostly rostral to copulatory organ; Seminal vesicles in bulb, directly attached to cuticular apparatus, of Macrodalyellia type (as a rule, with shafts, cross-bands, end branches with alternating spines and furrows, individuals may lack this part); seminal receptical a widening of oviducts; uterus with sphincter; eggs not stalked, naked once in uterus; cement glands present; genital opening in caudal third of body;
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