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Science 16 May 1975:
Vol. 188. no. 4189, pp. 730 - 732
DOI: 10.1126/science.1124394
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Articles

Science, Vol 188, Issue 4189, 730-732
Copyright © 1975 by American Association for the Advancement of Science

articles

Uniflagellate spermatozoa in Nemertoderma (Turbellaria) and their phylogenetic significance

S Tyler and RM Rieger

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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Science. ISSN 0036-8075 (print), 1095-9203 (online)