It is the largest species of modern lungfish. It is about 125 cm long and weighs 10 kg. The body is long and spindle-shaped, covered with large and thin round scales. The pectoral fin and ventral fin are leaflike, the fleshy part is scaly, and the dorsal fin, caudal fin and anal fin are connected into a whole. The swim bladder is very long and does not match. There are two fiber bands in the swim bladder. One back and one abdomen divide the swim bladder into left and right parts, and many symmetrical diaphragms are formed on both sides, which divide the swim bladder into many symmetrical small air chambers (alveoli). Five pairs of gills, very developed.