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Uniflagellate Spermatozoa in Nemertoderma (Turbellaria) and Their Phylogenetic Significanc

1975; American Association for the Advancement of Science; Volume: 188; Issue: 4189 Linguagem: Inglês

10.1126/science.1124394

1095-9203

Seth Tyler, Reinhard M. Rieger,

Marine Biology and Ecology Research

An ultrastructural study of Nemertoderma (Turbellaria, Nemertodermatida) has revealed that its spermatozoa have only a single flagellum. 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.