Delphinidae

Delphinidae is a family of cetecea that includes animals that in English are called dolphins and whales. Not all animals that are called dolphins or whales are included into delphinidae, these words are more of a basic description based on the build of the animal rather than it's evolutionary path. 
Subfamilies in Delphinidae include:
* Delphininae
* Lissodelphininae
* Orcininae
* Stenoninae
There is also a genus that isn't included in any subfamily, that being Lagenorhynchus.