Testudines

order of reptiles characterized by a shell Turtles & Tortoises (Testudines) is an order comprising closely related families of organisms. It contains 2 families with 3 known species. This includes the family groups Sea Turtles, and Tortoises. Among its members, 3 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). Well-known representatives include Green Sea Turtle. It belongs to Reptiles (Reptilia).