from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of numerous animals belonging to the phylum Chordata, having at some stage of development a dorsal nerve cord, a notochord, and gill slits and including all vertebrates and certain marine animals, such as the lancelets.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A member of the phylum Chordata; numerous animals having a notochord at some stage of their development; in vertebrates this develops into the spine
- adj. Of such animals.
from The Century Dictionary and Cyclopedia
- Having the characters of the Chordata; pertaining to or resembling the Chordata: as, a chordate animal.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any animal of the phylum Chordata having a notochord or spinal column
- adj. of or relating to or characteristic of the Chordata
In contrast, a region deep in the brain associated with reward processing, attention and motor movements - the chordate nucleus - was enlarged in subjects who were addicted to the drug.
A data dump now about problems with metazoan (or chordate or mammalian) phylogeny would be getting ahead of the discussion.
It's just one of the many peculiarities of being a chordate on Sol's 3rd rock.
And yes the point is the soldier is part of the Army, Corps, Division, etc just as a human is an animal, chordate, etc.
Most members of the chordate phylum, those in the subphylum Vertebrata, replace the notochord with vertebrae (the backbone) later in development to support the pelvic and pectoral girdles (to which the front and hind limbs are attached) and to protect the spinal cord.
Amphioxus is a primitive chordate, more primitive than lampreys, that clot their haemolymph.
The change in the albedo of the world as dark plants spread and white clouds rained themselves away brought more and more habitats into use, and before long the chordate fauna of Earth was once again upon a pristine world, humanless and safer here on Garden than for the last ten thousand years on its world of origin.
The same mitochondrial DNA sequences placed echinoderms - which include starfish and sea urchins - in closer proximity to the vertebrates than amphioxus even though, being a chordate, we would expect amphioxus to be closer (Ref 2).
Prior to this time, all the embryonic chordate has of a body plan is a couple of specified axes, a notochord, and a dorsal nerve tube.
The pharyngula stage/phylotypic stage is the time when Hox gene expression is ordered and active, when organogenesis is ongoing, and when the hallmarks of chordate embryology, like segmental myotomes, a tailbud, and branchial arches are forming.
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