Write down four characters of Osteichthyes and give two examples.

Osteichthyes:

1. It includes both marine and freshwater fishes with a bony endoskeleton.
2. Osteichthyes are a class of jawed fishes having a bony endoskeleton.
3. Osteichthyes is a class of fishes included in the division Gnathostomata, which includes all the vertebrates having jaws.
4. Their body is streamlined.
5. Body is generally spindle-shaped.
6. Skin is either naked or covered with cycloid or ctenoid scales.
7. Heart is either two chambered containing one auricle and one ventricle.
8. Bony fish/Osteichthyes have air bladders present.
9. Air bladders regulate buoyancy
10. Mouth is mostly terminal.
11. Examples are seahorse and rohu.