Question

diffrentiate between the animal of chomdrichytes and ostiechytes give six reasons
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Answer 1

Answer:

Similarities Between Chondrichthyes and Osteichthyes Chondrichthyes and Osteichthyes are the two classes of fish, who are aquatic chordates. Both fish belong to the superclass Pisces. Both have both endoskeleton and exoskeleton. Breathing of both fish occurs through gills. They have a mouth with jaws. Their fins are paired.

Difference Between Chondrichthyes and Osteichthyes. The main difference between Chondrichthyes and Osteichthyes is that the Chondrichthyes is the class of bony fish whose endoskeleton is made up of cartilages whereas Osteichthyes is the class of cartilaginous fish whose endoskeleton is made up of bones.

Some Chondrichthyes include skates, sharks, and ray fish while some examples of Osteichthyes are salmon fish, trout, rohu, and seahorse. Chondrichthyes are cartilaginous fish whose endoskeleton is made up of cartilages while endoskeleton of Osteichthyes is made up of bones.

Even though they have jaws, chondrichthyes don't have any bones. Instead, their skeletons are made of cartilage, which is a flexible type of tissue. In fact, the word 'chondrichthyes' means 'cartilaginous fishes.' There are numerous kinds of cartilaginous fishes alive in oceans today, including over 600 species of sharks, rays, and chimaera.

Explanation:

Answer 2

Explanation:

Chondrichthyes

The mouth is ventral in position.

The body is covered with minute and microscopic placoid scales, the skin is tough.

Paired pelvic fins are provided with claspers in males.

The tail is heterocercal, the vertebral column extending into the dorsal part of the caudal fin.

The head is dorsoventrally flattened.

Gill slits, usually five pairs, open sepa­rately and directly to the exterior.

The gills are hemibranch/holobranch.

Operculum always absent.

A spiracle usually present.

The endoskeleton is cartilaginous.

Osteichthyes

The mouth is apical in position.

The body is covered with cycloid or ctenoid or ganoid scales.

The skin is soft. Complete absence of scales in cat fish group.

Claspers are absent.

The tail is homocercal, the vertebral column ends at the middle of the base of the caudal fin.

The head may be dorsoventrally or laterally flattened.

Gill slits, usually four pairs, open in a gill chamber.

The gills are holobranch.

Operculum with branchiostegal mem­brane always present.

A spiracle is absent.The endoskeleton is bony with amphicoelous vertebrae.

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