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Segmentation, body symmetry and the organization of the central nervous system in echinoderms
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Abstract
The organization of the echinoderm central nervous system (CNS) is striking because it varies widely from that of other bilaterians; however, the basis for this is unknown. In the present paper, I identify echinoderms as compound and I show that this is the basis for their radial symmetry and the organization of their CNS. The asteroids, as I show, comprise of bilaterally symmetrical zooids arranged radially. Furthermore, I show that segmentation is the mechanism by which the gene Sonic hedgehog (Shh) bifurcates and duplicates patterning.
DOI
https://doi.org/10.32942/osf.io/pm359
Subjects
Ecology and Evolutionary Biology, Evolution, Life Sciences
Keywords
bilateral symmetry, cnidarian body plan, compound animals, echinoderm body plan, nervous system organization, radial symmetry
Dates
Published: 2020-07-26 03:41
Last Updated: 2020-07-31 09:30
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License
CC-By Attribution-NonCommercial-NoDerivatives 4.0 International
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