Which species is recognized as the largest freshwater turtle in North America?

The Alligator Snapping Turtle is recognized as the largest freshwater turtle in North America due to its impressive size and distinctive features. Adult alligator snapping turtles can weigh upwards of 200 pounds and measure more than two and a half feet in length. They are known for their rugged appearance, which includes a heavily armored shell and a unique, worm-like appendage on their tongue that they use to lure fish. This species primarily inhabits the southeastern United States, where its size and strength allow it to occupy a top position in the freshwater ecosystems it inhabits.

In contrast, the Common Snapping Turtle, while large, does not reach the same size as the alligator snapping turtle. Loggerhead Turtles are predominantly marine and do not inhabit freshwater environments, making them unrelated to the question. The Softshell Turtle, though also a significant species, is generally much smaller than the alligator snapping turtle. Therefore, the alligator snapping turtle stands out as the largest freshwater turtle in North America.