Question

Write any few difference between chondrichthyes and osteichthyes​

Answer 1

Answer:

it will help you for sure...

Answer 2

Answer:

→ Class Chondrichthyes :

• Have cartilagenous endoskeleton.  

• Mouth ventral.  

• Gill slits without operculum.  

• Skin has placoid scales.  

• Usually oviparous, fertilisation internal.  

• No air bladder, so swim constantly to avoid sinking.  

• Teeth are backwardly directed, modified placoid scales.  

• Notochord is persistent throughout life. Males have claspers on pelvicfins.  

• e.g., Torpedo, Trygon, Scoliodon.

→ Class Osteichthyes :

• Have bony endoskeleton.  

• Mouth is usually terminal.  

• Four pairs of gill slits covered by operculum.  

• Skin has cycloid/ctenoid scales.  

• Usually viviparous, fertilisation external.  

• Have air bladder which regulates buoyancy.  

• e.g., Hippocampus, Labeo, Catla, Betta.