genital opening slightly in front of mid body; with one pair germovitellaria, sometimes with a beginning of a separation; seldom a bursa; section of female canal often serves as receptaculum; male copulatory organ with rudimentary penis papilla; pharynx small and spherical; sometimes with sparse dermal rhabdites; egg capsule develops in parenchyma (viviparous); endoparisite of marine mussels and snails;
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