Turtles and Tortoises and Terraspins are all considered reptiles with shells
and the only difference between them are where and which environment they live in.
They are all under the Testudines category under Reptiles (Reptilia)

Turtles=live in some body of water

• Cagle's Map Turtle
• Ringed Map Turtle
• Yellow-Blotched Map Turtle
• African Side-necked Turtle
• Chicken Turtle
• Painted Turtle
• Red-eared Slider
• Spiny Soft-shelled Turtle
• Spotted Turtle
• Argentine Snake-necked Turtle
• Matamata Turtle
• Pig-nosed Turtle
• Snapping Turtle

Tortoise=live on land

• African Spurred Tortoise
• Aldabra Tortoise
• Leopard Tortoise
• Russian Tortoise
• Sulcata Tortoise
• Red-Footed Tortoise
• Radiated Tortoise
• Malacochersus Tornieri (Pancake Tortoise)
• Hermann's Tortoise
• Marginated Tortoise
• Gopher Tortoise
• Greek Tortoise
• Galapagos Tortoise
• Elongated Tortoise
• Hingeback Tortoise
• Yellow Foot Tortoise
• Desert Tortoise

Terraspins=reptiles with shells that dwell on land or water

• Eastern Box Turtle
• Florida Box Turtle
• Ornate Box Turtle
• Three-toed Box Turtle
• Black Wood Turtles
• Ornate Wood Turtle