Class Osteichthyes - Practice Questions & MCQ

• These fishes have a bony skeleton.
• They have a large mouth with movable jaws.
• Their body is covered with cycloid or ctenoid scales. These scales are impermeable to water. 
• The gill slits are covered with an operculum.
• They have a closed circulatory system with two-chambered heart having one atrium and one ventricle.
• They possess air bladder or swim bladder that maintains the buoyancy. 
• They have defined lateral line system of sense organs.
• They are cold - blooded.
• They are oviparous and perform external fertilization.
  

Difference between Chondricthyes and Osteicthyes can be summarised as