Question

Why fishes of dipnoi group called lung fishes?? Give some examples

Answer 1

the fishes of dipnoi group called lung fishes because their air bladder are connected to their nostrils and act as lungs.

example

dipnorhynchus
protopteridae

Answer 2

The fishes of group dipnoi are called lung fishes because the air bladder present in them function as their lungs and help in respiration... That is why they are called lung fishes too..
Examples are :
Protopterus (south african lungfish)
Neocerotodus ( Australian lung fish)
Lapidosiren ( South American lung fish)

Hope it helps u