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  • Title: Uniflagellate spermatozoa in Nemertoderma (Turbellaria) and their phylogenetic significance.
    Author: Tyler S, Rieger RM.
    Journal: Science; 1975 May 16; 188(4189):730-2. PubMed ID: 1124394.
    Abstract:
    An ultrastructural study of Nemertoderma (Turbellaria, Nemertodermatida) has revealed that its spermatozoa have only a single falgellum. This is the first uniflagellate spermatozoon known in the Turbellaria; it is indicative of the primitiveness of Nemertoderma and is evidence in support of the view that the Turbellaria as a whole are among the most primitive living Bilateria.
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