Definition Dörjes 1968, Fegley et al. 1984: Frontal glands not strongly developed. Unpaired ovary with germinal zone located posterior to mouth. Paired testes. Male organ with ciliated antrum masculinum, with at least one proximal gland ring. With or without epidermal pigment. Seminal vesicle and penis lacking. With or without vagina and seminal bursa. Bursa without nozzle. Vagina, when present, a tissue connection indistinct in sectioned material.
Notes for the valid (accepted) taxonomic name
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