Chordate and Vertebrate Body Plans
Published Online: 19 APR 2001
Copyright © 2001 John Wiley & Sons, Ltd. All rights reserved.
How to Cite
Jefferies, R. 2001. Chordate and Vertebrate Body Plans. eLS. .
- Published Online: 19 APR 2001
The phylum Chordata is divided into: (1) Craniata (including the Vertebrata), (2) Urochordata or tunicates, and (3) Cephalochordata or lancelets, the best known of which is amphioxus (Branchiostoma). Each of these three subphyla differs greatly from the other two in the body plan (the broad layout of an animal and its division into major anatomical regions such as head, trunk or tail) of its extant members. The longitudinal extent of the notochord is crucial in this respect.
- convergent extension;
- tail–head overlap;
- organ pairing