Koinocystididae. With accessory atrial organ containing a cuticular rod. Copulatory organ oviform, weakly muscular with eversible cirrus lined with minute uniform teeth. Muscular copulatory bursa with terminally adjoined seminal receptacle. Resorptive vesicle opening in the male genital canal. Testes behind the pharynx. With strong closed proboscis sphincter and pharynx mouth sphincter.[From Karling TG (1980): 243]
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