One particular feature found in bony fishes but is absent in cartilaginous fishes:

Name: One particular feature found in bony fishes but is absent in cartilaginous fishes:
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Swim bladder is a feature found in bony fishes (osteichthyes) that allows them to control their buoyancy and maintain their depth without having to swim constantly. Cartilaginous fishes (chondrichthyes), such as sharks and rays, lack this feature and often have to swim to avoid sinking.

One Particular Feature Found in Bony Fishes but Is Absent