Dendrocoelidae with an adhesive organ in the center of the anterior margin; colored or white; eyes two or none; penis papilla lacking; ejaculatory duct enters large, expanded, weakly muscular but highly glandular chamber (presumably the penis bulb) continuous posteriorly with the reduced male antrum; common ovovitelline duct enters the roof of the male antrum, immediately anterior to the entrance of the bursal canal.[From Hyman LH (1953): 1-2]
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