In their very limited range, stranded Guiana dolphins can be readily identified by their extremely small size (to 5.6 feet [1.7 m]) and nearly triangular dorsal fin. Furthermore, in addition to the characteristics listed above distinguishing living Guiana dolphins from Atlantic bottlenosed dolphins, the species can be distinguished by differences in the numbers of teeth:
| Atlantic Bottlenosed Dolphins | Guiana Dolphins |
|---|---|
| TEETH | |
| 20-26 in each upper jaw;18-26 in each lower jaw. | 26-35 in each jaw; oftenragged in arrangement. |
