Chordata

(redirected from Chordates)
Also found in: Dictionary, Thesaurus, Encyclopedia.

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 ?
Cell signaling and transcription factor genes expressed during whole body regeneration in a colonial chordate.
Ciona intestinalis is a basal chordate and a close relative of vertebrates, (7,8) and the Ciona larva exhibits a typical chordate body plan.
Such a scenario would also explain why the lancelet amphioxus, a 'primitive' chordate, has a notochord with both cartilage and muscle.
Another characteristic of chordates are myomeres, blocks of muscle tissue often arranged in a zig-zag pattern.
As fossils show, representatives of animal phyla still alive today developed then: mollusks, arthropods, worms of all kinds, and chordates.
However, elementary school textbooks pay little attention to the invertebrates, and an examination of the textbooks used in compulsory secondary education showed that the majority devote the same number of pages, or even fewer, to the group of invertebrates as a whole than to the phylum of chordates or to the subtype of vertebrates, according to the different publishers.
The chordates include the vertebrates, which includes us.
The major body plans found in most modern animal groups, such as arthropods and chordates, were established by the Cambrian.
They are now convinced the 2in-long Florida lancelet anchovy, which has hardly changed in more than 500million years, is descended from the earliest chordates, the group from which we are all descended.
ENTEROCOELE the body cavity formed from an outpocketing of the archenteron (a primitive digestive cavity), especially typical of echinoderms and chordates [RHD].
1991): Evolution of oral apparatuses in the conodont chordates.