1) Family chelydridae 2) Reptile family 
The Chelydridae are a family of turtles which has seven extinct and two extant genera. The extant genera are Chelydra, the snapping turtles, and Macrochelys. Both are endemic to the Western Hemisphere. The extinct genera are Acherontemys, Chelydrops, Chelydropsis, Emarginachelys, Macrocephalochelys, Planiplastron, and Protochelydra. ==Fossil histo...
[n] - snapping turtles
family Chelydridae noun snapping turtles