Tropidonophis mairii
| Common keelback | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Reptilia | 
| Order: | Squamata | 
| Suborder: | Serpentes | 
| Family: | Colubridae | 
| Genus: | Tropidonophis | 
| Species: | T. mairii | 
| Binomial name | |
| Tropidonophis mairii (Gray, 1841) | |
| Synonyms | |
Tropidonophis mairii, also known commonly as Mair's keelback, the common keelback, and the freshwater snake,: 566 is a species of colubrid snake in the subfamily Natricinae. The species is native to Australasia.