Inversion of the chordate body axis: Are there alternatives?
- 25 April 2000
- journal article
- review article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 97 (9) , 4445-4448
- https://doi.org/10.1073/pnas.97.9.4445
Abstract
One major morphological difference between chordates and annelids or arthropods is the opposite orientation of the nerve cord and heart. A long-standing proposal is that the chordate axis evolved by inverting the body of an ancestor with the annelid/arthropod orientation. However, the data can also be explained by a common ancestor with diffuse dorsoventral organization, followed by oppositely directed condensation of the nerve cord and relocation of the heart in the two lines.Keywords
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