1. The endoskeleton is made up of endochondral bone.
2. Body covered with ganoid or cosmed scales. Cosmead starch contains cosmin.
3. Pinds have paired fins with fleshy lobes.
4. The caudal fin is diphysercal in nature. That is, the two parts of the caudal fin are united and are located around the tail as a uniform and flexible fin.
5. Bony gills are present on both sides of the head. They breathe through gills.
6. Their gills are covered by gills.
7. Their air sacs or patacas are rich in blood vessels and help them to swim and float.
8. Their heart has two chambers.
9. They are cold blooded or ectothermic animals. That is, their body temperature changes with the rise and fall of the environment temperature.
10. Their jaws have enamel covered teeth.
11. They are unisexual animals. They are external or internal.
[key words to remember features: endoskeleton, ganoid, cosmed, fin, diphycercal, gill, kanko, cracker, ectothermic, enamel]