Hydromedusa
- For the hydrozoan Cnidaria called "Hydromedusa" or "Hydromedusae", see Anthomedusae.
| Hydromedusa Temporal range: Paleocene-Recent
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| Argentine snake-necked turtle, Hydromedusa tectifera | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Testudines |
| Suborder: | Pleurodira |
| Family: | Chelidae |
| Subfamily: | Hydromedusinae |
| Genus: | Hydromedusa Wagler 1830 |
| Species | |
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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
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