| The flippers, fluke, and the tall, falcate, dorsal fin are all a darker grey than the body. |
| The dorsal fin was relatively small, falcate, and obtusely terminated. |
| Front outer angle of each front wing projecting into a falcate tip. |
| In the genus Pontoporia the dorsal fin is well developed and falcate. |
| The dorsal fin is small, located behind the midpoint of the back, and variable in shape from falcate to triangular. |
| Beaked whales have a small, falcate dorsal fin, which is set fairly far back on their bodies. |
