Hydromedusa

For the hydrozoan Cnidaria called "Hydromedusa" or "Hydromedusae", see Anthomedusae.

Hydromedusa Temporal range: Paleocene-Recent ~62–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Argentine snake-necked turtle, Hydromedusa tectifera
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Pleurodira
Family:	Chelidae
Subfamily:	Hydromedusinae
Genus:	Hydromedusa Wagler 1830
Species
†H. casamayorensis De la Fuente & Bona 2002 H. maximiliani Mikan 1820 H. tectifera Cope 1869

Hydromedusa is a turtle genus in the family Chelidae, commonly known as the South American snake-necked turtles. They are quite closely related to the South American side-necked swamp turtles (Acanthochelys) and the snake-necked turtles of the Australian-Melanesian region (Chelodina), but less closely to the spine-necked river turtles of South America (Podocnemididae) which belong to a more modern lineage of Pleurodira.

Species

This genus contains the following extant and fossil species:

• Brazilian snake-necked turtle, Cágado da Serra, Hydromedusa maximiliani
• Argentine snake-necked turtle, Cágado pescoço de cobra, Hydromedusa tectifera
• Hydromedusa casamayorensis De la Fuente & Bona 2002, Salamanca and Sarmiento Formations, Argentina