File:EB1911 Tunicata - Stages in the Embryology of a Simple Ascidian.jpg
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current | 19:42, 17 July 2019 | 805 × 913 (216 KB) | Bob Burkhardt | {{Information |description ={{en|1=Stages in the Embryology of a Simple Ascidian. See legend below.}} |date =published 1911 |source =“Tunicata,” ''Encyclopædia Britannica'' (11th ed.), v. 27, 1911, p. 384, fig. 13. |author =After Kowalevsky. |permission ={{PD-Britannica}} }} {{en|Legend:}} A to F, Longitudinal vertical sections of embryos, all placed with the dorsal surface uppermost and the anterior end at the right. A, Early blastula stage, during segmentation.... |
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