What is a limb called that has five digits?

A limb with five digits is referred to as a pentadactyl limb. The term "penta-" means five, and "dactyl" derives from the Greek word for finger or toe. This limb structure is characteristic of many vertebrates, particularly in mammals, birds, reptiles, and amphibians. The pentadactyl limb's design is a key aspect of evolutionary biology, showcasing the common ancestry among these groups and how adaptations have occurred over time while maintaining a fundamental structural theme.

Other limb types mentioned have different digit counts or configurations. For instance, a hexadactyl limb refers to a limb with six digits, while a tetrapod limb denotes limbs of four-legged organisms, and a quadrupedal limb refers to limbs used for walking on all fours. The distinction of the pentadactyl form highlights its importance in the study of evolutionary biology and comparative anatomy.