Turbellarian taxonomic database
Acoela Antigonariidae Diagnosis
Mouth opening ventral in anterior end. Male genital pore shortly behind mouth. Paired germinal zones in middle of body. Sperm development toward anterior, egg development toward posterior. Ovary and testis unpaired. Male copulatory organ of a long ciliated antrum tube and a false seminal vesicle. Seminal vesicle and penis lacking. Female accessory organs absent.
[From Dorjes J (1968): 109]
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