File:Origin of Vertebrates Fig 167.png
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English: Fig. 167.—A, Diagram of Section through a Trilobite-like Animal; B, Diagram to illustrate the Suggested Formation of the Notochord from a Ventral Groove; C, Diagram to illustrate the Suggested Formation of the Post-Branchial Gut by the continuation of the same process of Ventral Groove-Formation, combined with Obliteration of Appendages and Growth of Pleural Folds; D, Diagram to illustrate the Completion of the Vertebrate Type by the Meeting of the Pleural Folds in the Mid-Ventral Line with the Obliteration of the Atrial Cavity and the Conversion of the Ventral Groove into the closed Alimentary Canal.
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| Date | |
| Source | The Origin of Vertebrates. https://archive.org/details/originofvertebra1908gask |
| Author | Walter Holbrook Gaskell. |
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The author died in 1914, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 10:19, 11 November 2013 | | 2,016 × 1,928 (251 KB) | Keith Edkins (talk | contribs) | Cleaned |
| 09:57, 11 November 2013 |  | 2,016 × 1,928 (255 KB) | Keith Edkins (talk | contribs) | == {{int:filedesc}} == {{Information |Description={{En|Fig. 167.—A, Diagram of Section through a Trilobite-like Animal; B, Diagram to illustrate the Suggested Formation of the Notochord from a Ventral Groove; C, Diagram to illustrate the Suggested Fo... |
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