from the GNU version of the Collaborative International Dictionary of English
- n.pl. A comprehensive division of animals including all Vertebrata together with the Tunicata, or all those having a dorsal nervous cord.
from The Century Dictionary and Cyclopedia
- A primary division or subkingdom of the animal kingdom, containing all animals which have or have had a notochord, thus including the true vertebrates (also called Craniota), the leptocardians, or Cephalochorda, and the tunicates, or Urochorda.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. comprises true vertebrates and animals having a notochord
Sorry, no etymologies found.
As chordata is predated by bilateria, that would indicate that the evolutionary process is ongoing, not 'instantaneous'.
Upwards from it we have vertical lines going through eukarya (1), metazoa (2), and finally chordata (3).
In this picture chordata are still traceable to a unique branch originating at the ground level (0).
The only point that I was trying to make was that during the Cambrian âwe see the origin of the vast majority the basic phyla that are in existence today. â For example we we along with other vertebrates belong to the phyla chordata.
All are members of the chordata, the deuterostomes with notochords.
The brain stem is considered to be the oldest part of our brain, oldest in that it is found even in the simplest of animals in our phylum, the chordata.
Hence we may conclude, according to the laws of the theory of descent, that all these chordonia or chordata (tunicates and vertebrates) descend from an ancient common ancestral form, which we may call Chordaea.
What is the major evolutionary advancement of the phylum chordata?
We were well received as we hammered out about 9 songs from the chordata album.
The Democratic party has clearly resigned its membership in phylum chordata; how soon will they depart the community of multicellular organisms?