general introduction of chordata, origin and is history

1. - By Zoomania

2. Chordata- general characters
 Chordata [in greek 'chord' meaning “string.”
 Blong to kingdom “Animalia.”
 Higher phylum (eg.blue whel).
 comparises 17000sp of animals.
 In chordates, it is located dorsal to the
notochord.

3. • Posseses notochord benith nerve chord.
• Notochord is dorsal longitudinal skeletal rod like
structure.
• Simpaly notochord mean spinal chord.
• Notochord madeup of vacullated nerve cells.
• Position of notochord desides classification of
chordates.

4. Chordates
 Presence of notochord.
 Pharyngial gills slits present in pharynx.
 Post anal tail.
 closed vascular system.
 ventral heart present.
 Heapatic portal symmetry.

5.  Bilaterally symetrical.
 Having metamerism and
ceolom.
 having heamoglobin in
RBCs

6. clasification of chordates
Protochordata Vertebrata

7. * Clasification of chordates are besed on the presence of
notochord.
Protochordates
1. Prochodate.
2. Notochord lack of true
body.
3. The lower chordates.
4. Also known as Acraniata
because they lack a true
skull.
5. Are closely related to
vertebrates.
Vertebrates
1. Persence of notochord.
2. Also called Craniata.
3. Higher chordates.
4. Predominant subphylum
of the phylum Chordata.

8. Protochordates
• Protochordate is an informal category of organisms to
describe the invertebrates that are closely related to
vertebrates.
• Protochordata is divided into the following three sub-
phyla:
A. Hemichordata
B. Urochordata
C. Cephalochordata

9. Notochord present in
anterior half of body.
 Eg.Balanoglosus
Hemichordata

10. Urochordata
Notochord
presence in tail
region.
Eg.Ascaria.

11. Cephalochordata
Notochord
present in tip of
head.
 Eg. Amphioxus

12. .Vertebrae
• Vertebrate, also called Craniata, any animal of the
subphylum.
• Vertebrata, the predominant subphylum of the
phylum Chordata.
• They have backbones, from which they derive their
name.
• The vertebrates are also characterized by a muscular
system.

13. The major groups of vertebrates include fishes, amphibians,
reptiles, birds, and mammals.