mouth ventral, posterior to brain; common gonopore with definite bursa copulatrix but without antrum feminum and sperm duct; gonads unpaired; single male copulatory organ of simple type; without eyes; without caudal sensory organ; penis stylet simple, not thickened; with accessory gland organ and gland stylet; gland stylet not thickened; mid-piece bowl-shaped; mouth-piece long, with small thickening; sperm duct as simple continuation of mouth-piece; nerve cords inside circular muscles;
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