Geographic distribution: North Sea Island of Sylt. Faubel A 1974 (citation)- defines new genus p 11, for 1 species from Sylt, Convoluella brunea Faubel 1974 type. Faubel A 1976 (citation)- gives definition p 23: "Frontal organ present. Mouth opening ventral. Rhabdites in longitudinal rows. Germinal zone of ovaries and testes paired. Bursa seminales with a cell cap and a short vagina. Two gonopores ventral. Antrum masculinum very muscular inverted into the penis sac. Proximal part developed as a basophil seminal vesicle. Seminal vesicle enclosed in penis sac."
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