Origin of air bladder
Examples from the Web for air bladder
In a few primitive fishes (Dipnoans, Crossopterygians, Ganoids) the air-bladder retains its original function of a lung.
In attempting to answer this question we must first consider the air-bladder in relation to the fish tribe as a whole.
The air-bladder large and strong, and in some cases notched on the margin.The Ocean World:|Louis Figuier
Showing nuptial tubercles and intestines coiled about the air-bladder.
The air-bladder resembles the lungs of terrestrial vertebrates.