1) Actinopterygii are a class of ray-finned fish.

2) The vast majority of fish species belong to the class Actinopterygii.

3) Actinopterygii have fins supported by bony rays.

4) Some well-known examples of Actinopterygii include salmon and trout.

5) Actinopterygii are known for their diverse habitats, spanning from freshwater to saltwater environments.

6) The unique skeletal structure of Actinopterygii distinguishes them from other types of fish.

7) Actinopterygii have a streamlined body shape for efficient swimming.

8) Many species of Actinopterygii are commercially important for fisheries.

9) Actinopterygii display a wide range of feeding behaviors, from herbivorous to carnivorous.

10) Biologists study the evolutionary history of Actinopterygii to better understand the diversity of fish species.