Members of the Class __________ are Sometimes Called the Ray-Finned

Question

Members of the class __________ are sometimes called the ray-finned fishes.
A)Actinopterygii
B)Holosteii
C)Rhipidistii
D)Crossopterygii
E)Myxini

Accepted Answer

Members of the class Actinopterygii are characterized by having fins that are supported by bony rays, which are flexible due to the presence of collagen fibers. This gives them the ability to fold and unfold their fins, providing greater control of movement and faster swimming speeds. They are sometimes called the ray-finned fishes because of this feature. Holosteii, Rhipidistii, Crossopterygii, and Myxini are all different classes of fish that do not have this characteristic.