Chordata

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Chordata

 [kor-da´tah]
a phylum of the animal kingdom comprising all animals having a notochord during some developmental stage.

Chor·da·ta

(kor-dā'tă),
The phylum that includes the vertebrates, defined by possession of: 1) a single dorsal nerve cord (the brain and spinal cord of mammals); 2) a cartilaginous rod, the notochord, which forms dorsal to the primitive gut in the early embryo, and is surrounded and replaced by the vertebral column in the subphylum vertebrata; and 3) by presence at some stage in development of gill slits in the pharynx or throat.
[L. chorda, fr. G. chordē, a string]

Chordata

/Chor·da·ta/ (kor-dāt´ah) a phylum of the animal kingdom comprising all animals having a notochord during some developmental stage.

Chor·da·ta

(kōr-dā'tă)
The phylum that includes the vertebrates, defined by possession of 1) a single dorsal nerve cord (the brain and spinal cord of mammals); 2) a cartilaginous rod, the notochord, which forms dorsal to the primitive gut in the early embryo and is surrounded and replaced by the vertebral column in the subphylum vertebrata; and 3) the presence at some stage in development of gill slits in the pharynx or throat.
[L. chorda, fr. G. chordē, a string]

Chordata

a phylum of the animal kingdom comprising all animals having a notochord during some developmental stage.
References in periodicals archive ?
Such a scenario would also explain why the lancelet amphioxus, a 'primitive' chordate, has a notochord with both cartilage and muscle.
The extinct Pikaia gracilens has been confirmed as the oldest known member of the chordate family, which includes all modern vertebrates including humans.
Chordates without a skull, like the lancet, merely have one complex of box-genes while most vertebrates have four.
Dr David Ferrier, who led the St Andrews team, said yesterday: "The lancelet is one of only a very few invertebrates around today which are also chordates, which is why we chose to study it.
Innate immunity in early chordates and the appearance of adaptive immunity.
For example, the sea squirt has the beginnings of a spinal cord, making it a so-called chordate.
Though its body is clearly more primitive than creatures with backbones and spinal columns, the sea squirt nevertheless offers a valuable resource to scientists seeking to understand the evolutionary links between these simple chordates and more complex creatures.
And as its genome sequence verifies, this makes the sea urchin and other echinoderms more closely related to humans and other chordates than to other invertebrates such as insects, mollusks, and crustaceans (Pennisi, 2006).
The new Chengjiang species have a number of features not seen in amphioxus or other invertebrate chordates.
So did our family, the Chordates, which ranges from a half-inch fish in the swamps of Borneo to the truly leviathan 100-ton Blue Whale, with all the fishes, birds and mammals in between.
Invertebrates diverged from chordates -- the phylum to which vertebrates belong -- about a billion years ago.
Along its abdomen, the creature has V-shaped segments that closely resemble the stacked muscle blocks in primitive living chordates such as amphioxus.