| author | date | title | journal / publication | Falleni A, Gremigni V | 1990 | Egg covering formation in the acoel Convoluta psammophila (Platyhelminthes, Turbellaria): An ultrastructural and cytochemical investigation. | Acta Embryologiae et Morphologiae Experimentalis, 10(2): 105-112. 1989 [1990] |
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