There are three distinct classes for the turtle breed: Turtles, Tortoises, and Terrapin
Tortosies are the breed of turtles that roam on land. Considered to be one of the descendants of the anapsida clade, this type of turtles holds the record of longest life span ever for the animal species, with an average of living for 150 years. The oldest known turtle recorded was one named Tu'i Malila, who made it to 188 years old. For their long life span, tortoises are regarded as a symbol of long life in some cultures.
Turtles are the fresh-water breed, also believed to be descendants of the anapsida clade. Turtles are also the biggest species compared to the tortoise and terrapin, and are separated into two groups by how they fold their neck: Cryptodira (can retract their neck back into their shell) and Pleurodira (those that can fold theirs to the side).
Terrapin are not really their own class of turtles, but they are given their name for the diamond-shaped pattern on their shell. They occupy themselves in North America.