File:The primitive streak and notochordal canal in Chelonia (Plate I) BHL4780730.jpg

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PLATE I. All figures magnified 39 diameters.
Fig. 1. Dorsal view of an embryo Chrysemys picta. The concavity of the dorsal notochordal opening is directed posteriad.
Fig. 1'. Ventral view of the same. The jagged edges of the ventral notochordal opening show that the notochordal canal is in process of breaking through ventrally.

Fig. 2. Chelopus insculptus (Glyptemys insculpta), dorsal view. The concavity of the notochordal opening is directed anteriad.
Fig. 2'. Ventral view of the same. The notochordal canal has broken through at its anterior end.

Fig. 3. Chrysemys picta, dorsal view. The notochordal opening is a nearly transverse slit. The width of the broad notochordal canal is discernible on dorsal as well as ventral view.
Fig. 3'. Ventral view of the same. The anterior portion of the floor of the notochordal canal has broken through.

Fig. 4. Chelydra serpentina, dorsal view. The horns of the notochordal opening point posteriad. Along the axis of the embryo, reaching from the posterior lip of the notochordal opening to the posterior end of the shield, extends a well marked groove.

Fig. 4'. Ventral view of the same. Lateral portions of the shield have bent underneath during the process of hardening. The groove is discernible on the ventral surface as a light (unshaded) longitudinal band at the posterior end of the shield. The floor of the notechordal canal has broken through at its anterior end.
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Source https://www.biodiversitylibrary.org/pageimage/4780730 The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark.
Author Davenport, Gertrude Anna Crotty
Page ID
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4780730
Item ID
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26729 (Find related Wikimedia Commons images)
Title ID
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5777 (Find related Wikimedia Commons images)
Page numbers
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Plate I
BHL Page URL
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https://www.biodiversitylibrary.org/page/4780730
DOI
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10.5962/bhl.title.5777
Page type
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Illustration Foldout
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NOT_IN_COPYRIGHT
This file comes from the Biodiversity Heritage Library.

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current17:37, 8 April 2024Thumbnail for version as of 17:37, 8 April 20242,577 × 1,849 (585 KB)Rasbak (talk | contribs)
14:58, 19 November 2015Thumbnail for version as of 14:58, 19 November 20152,577 × 1,849 (183 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | source = http://www.biodiversitylibrary.org/pageimage/4780730 | description = The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark. |...

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