Question

What are Chondrichthyes ? Explain them.

Answer 1

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Here is your answer,

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Chondrichthyes  is a class that contains the cartilaginous fishes.

They are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.

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Answer 2

Answer :

Class - Chondrichthyes

• This is a class under Pisces.
• These are generally known as vertebrates.
• These are marine animals with streamlined body.
• They have cartilaginous endoskeleton.
• Their mouth is located ventrally.
• The notochord is persistent throughout the life.
• The gill slits are present separately and without operculum.
• The skin is tough which contains minute placoid scales.
• Their teeth are modified placoid scales.
• They have very powerful jaws.
• These are known to be predaceous.
• Their body has the absence of air bladder.
• The heart is two chambered.
• Some of them are known to have electric organs or poison sting.
• They are known to be cold blooded or poikilothermous.
• Their sexes are separate.
• They have internal fertilization, but many of them are viviparous.
• Ex : Trygon, Scoliodon, etc.