#ray-finned fish
- Actinopterygian — A fish belonging to the class Actinopterygii, structurally characterized by having fins supported by bony or cartilaginous rays (lepidotrichia) arranged radially, without fleshy lobes at the base. This vast group represents the dominant class of extant bony fishes, encompassing over 95% of all known fish species worldwide, adapted to diverse aquatic environments, from mountain freshwaters to abyssal ocean basins.