Convolutids with strongly developed, musculuos pharynx, 2-8 paires of prostatoid organs as in Convoluta convoluta and 6-40 nozzles. 0.5-2.5 mm long, droplett-shaped with ventrally enfolded sides, terminating with a tail at the posterior end. Mouth ventral in first body-third. Paired ovaries in germ and vitallaria-parts differentiated lying beneath each other. Seminal bursa more or less rudimentary, in O. limnophilus many separate bursae. Copulatory organ musculuous glandular, either invaginated into penis-sack or terminating into it. Nervous system in investigated animals with three pairs of longitudinal nerve cords.[From Dorjes J (1968): 89]
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