Mention the characteristic features of chordates:
Following are its basic features:
Bilateral symmetry, Triploblastic
Gills present at some phase of life.
Dorsal nerve chord
Post anal tail present at some stage of life, For example, present in humans in embryonic stages.
Subdivided into two
(a) Prochordata –
Notochord at some stage of life
Example- Herdemania, Amphioxus,
(b) Vertebrata –
Notochord converted to vertebral column
2,3,4 chambered heart
Organs like kidney for excretion
Example- humans(4 chambered), frog(3 chambered), fishes(2 chambered)
Vertebrates are divided into five classes namely Pisces, Amphibia, Reptillia, Aves and Mammalia.