Geographic distribution: North Sea, Sylt. Holotypes- Zoollgische Museum- Hamberg V13096 Faubel A 1976 (citation)- definition p 23-24. discussion p 24, 1 genus type Unantra polyvacuola. Definition: "Antroposthiidae with a ventral mouth opening. Frontal organ present. Germinal end of testes paired, that of ovary unpaired. Antrum masculinum muscular, inserted into penis sac. Proximal part developed as a granular vesicle. Seminal vesicle present. Female accessory organ lacking." type: Unantra polyvacuola description and illustration 24-26, figures 3,4. Faubel A 1977 (citation)- lists p 62, 64, 70, table 1.
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