Question

general characters of chodats

Answer 1

Characters of Chordates:

All the chordates possess four diagnostic characters either in the embryonic or adult stage.

1. Notochord:

It is a solid un-jointed, stiff but flexible rod-like structure situ­ated on the dorsal side between the dorsal hollow nerve cord and the alimentary canal.

2. Dorsal Hollow Nerve Cord:

The nerve cord of chordates is always hollow and lies dorsal to the notochord.

3. Pharyngeal Gill Slits:

All the chordates have at some stage of life, a series of paired narrow openings, the gill slits on the lateral sides of the pharynx.

4. Tail:

It is a post-anal part of the body.Which is reduced or absent in many adult chordates.

Other Characters of Chordates:

These include bilateral symmetry, three germinal layers, segmentation, organ-system level of organisation, cephalization, coelom, endoskeleton, complete digestive tract, special organs for respiration and excretion, closed circulatory system, separate sexes, gonads with gonoducts and without asexual reproduction.

Answer 2

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Classification:
kingdom: Animalia.
phylum: chordata.
subphylum: vertebrata.
division: gnanthostomata
super class: pisces
class: Chondrichthyes.

characters:
1) notochord present.
2) dorsal tubular nerve code and pharyngeal gill slits present.
3) Triploblastic, bilateral symmetry and coelomate animals.
4) closed circulatory system with haemoglobin in RBC's
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thanks....
nice to help you