Segments and parasegments in Arthropods: a functional perspective
Article first published online: 20 SEP 2004
Copyright © 2004 Wiley Periodicals, Inc.
Volume 26, Issue 10, pages 1117–1125, October 2004
How to Cite
Deutsch, J. S. (2004), Segments and parasegments in Arthropods: a functional perspective. Bioessays, 26: 1117–1125. doi: 10.1002/bies.20111
- Issue published online: 20 SEP 2004
- Article first published online: 20 SEP 2004
I review how both the parasegmental and segmental frames are used in constructing the body plan of the arthropods. The parasegment is the primary genetic unit, as shown by Hox gene expression, and the parasegmental design is maintained in the nerve cord. It is, however, not maintained in the epidermis, where the cuticle grooves are segmental, and in the musculature, which is segmental in organisation. This frame shift is reflected in the sensory and motor nerve connections between the ganglia and the periphery. I suggest that the need for movement in an organism equipped with a hard exoskeleton was the functional constraint that shaped this apparently complex mode of development. BioEssays 26:1117–1125, 2004. © 2004 Wiley Periodicals, Inc.