Kinosterninae

Kinosterninae is a subfamily of the family Kinosternidae, a family of aquatic turtles. Kinosterninae contains the genera Kinosternon and Sternotherus, which are native to much of the United States and northern Mexico. There are 27 species from 4 genera in the two subfamilies Staurotypinae and Kinosterninae. ^[1]

Comparison between the plastrons of Sternotherus and Kinosternon

Kinosterninae
Sternotherus odoratus stinkpot or common musk turtle
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Family:	Kinosternidae
Subfamily:	Kinosterninae Agassiz, 1857
Genera
Kinosternon Sternotherus