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Temporal range: Paleocene-Recent
~62–0 Ma
Hydromedusa tectifera.jpg
Argentine snake-necked turtle,
Hydromedusa tectifera
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Pleurodira
Family: Chelidae
Subfamily: Hydromedusinae
Genus: Hydromedusa
Wagler 1830

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.


This genus contains the following extant[1] and fossil species:


  1. ^ Gaffney, E. S. (May 10, 1977). "The side-necked turtle family Chelidae : a theory of relationships using shared derived characters. American Museum novitates ; no. 2620". Novitates. 2620. Retrieved 13 April 2022.