Hydromedusa
Hydromedusa, commonly known as the South American snake-necked turtles, is a genus of turtles in the family Chelidae. They are quite closely related to the South American side-necked swamp turtles and the snake-necked turtles of the Australian-Melanesian region, but less closely to the spine-necked river turtles of South America which belong to a more modern lineage of Pleurodira.
Species
This genus contains the following three species:- †Hydromedusa casamayorensis – Salamanca and Sarmiento Formations, ArgentinaHydromedusa maximiliani – Brazilian snake-necked turtleHydromedusa tectifera – Argentine snake-necked turtle