Britannica Sources used in this answer

How do the legs and feet of tortoises differ from those of aquatic turtles?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Illustrations of ten representative chelonians, including spiny softshell turtle, Galapagos giant tortoise, green turtle, alligator snapping turtle, Blanding's turtle, common map turtle, eastern box turtle, eastern painted turtle, spotted turtle, and eastern mud turtle, each labeled with its common and scientific name. A scale bar at the bottom shows size comparison. — turtle Turtles (order Testudines).

The legs and feet of tortoises and aquatic turtles differ significantly due to their respective environments and modes of locomotion.

Tortoise Anatomy

Tortoises are exclusively land-dwelling creatures and possess distinct hind-limb anatomy characterized by elephantine, or columnar, limbs that support their weight on land. Their forelimbs are not flipperlike, and their feet lack webbing. Additionally, each digit in a tortoise's forefeet and hind feet contains two or fewer phalanges.1

Aquatic Turtle Anatomy

In contrast, aquatic turtles have evolved specialized limbs for movement in water:
* Freshwater Turtles: These species typically have webbed feet to assist with swimming. While they use their hind legs for propulsion, their limb movements in water generally alternate. Some species, such as snapping or mud turtles, are primarily bottom-walkers and use their limbs in a manner similar to terrestrial movement.234
* Sea Turtles: These turtles have forelimbs that have evolved into bladelike flippers, where the forearm and hand are compressed into a single, inflexible unit. They propel themselves by moving these flippers in a synchronized, figure-eight pattern, while their webbed hind feet function primarily as rudders.32