Vitellaria caudally continuing into the germaria efferent; deferent tracts of the female copulatory organ connecting the fecundatorium and the atrium genitale commune; efferent tract always provided with a cuticular bursal appendage; vasa defferentia widened into two spermaducal vesicles, before they enter the muscular part of the copulatory organ (except in Marinella, where only one spermaducal vesicle occurs); male cuticular copulatory organ consisting of the penis stylet and mostly also of the stiffened wall of the male genital atrium (except in Beklemycheviella); margin of the pharynx without cilia (except Marinella);
Diagnosis for the valid (accepted) taxonomic name
Diagnosis for Thalassotyphloplanida Trigonostomidae
With one genital pore and paired male and female gonads; testes solid, ventral to the vitellaria; female gonads connected to the exterior by a deferent and an efferent tract;
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