Noun | 1. | ![]() animal order - the order of animals Anapsida, subclass Anapsida - oldest known reptiles; turtles and extinct Permian forms chelonian, chelonian reptile - a reptile of the order Chelonia Dermochelyidae, family Dermochelyidae - sea turtles Chelydridae, family Chelydridae - snapping turtles family Kinosternidae, Kinosternidae - mud turtles; musk turtles Emydidae, family Emydidae - box and water turtles family Testudinidae, Testudinidae - land tortoises family Trionychidae, Trionychidae - soft-shelled turtles |