The porpoises are in the family Phocoenidae and the dolphins are in the family Delphinidae.    From Wordnik.com.  [Dolphins and Porpoises] Reference

Both Tucuxi and Irrawaddy dolphins are distinct from the other five species in that they are part of the Delphinidae family of mostly ocean-dwelling dolphins.    From Wordnik.com.  [National Geographic News] Reference

The White-beaked Dolphin (Lagenorhynchus albirostris) is a marine mammal belonging to the family Delphinidae (dolphins) in the suborder of the Odontoceti, or toothed whales.    From Wordnik.com.  [WN.com - Articles related to Japan shows 'The Cove' after delay from protests] Reference

We use the term dolphin to refer to members of the taxonomic family Delphinidae, which consists of thirty-three species of dolphins ranging from coastal to pelagic and tiny to large.    From Wordnik.com.  [NPR Topics: News] Reference

The toothed whales are divided into the Physeteridae, the Delphinidae, and the Platanistidae, which latter is placed between the two other families, and is divided into the sub-families Iniinae and.    From Wordnik.com.  [More Letters of Charles Darwin — Volume 2] Reference

HONOLULU-In an announcement with grave implications for the primacy of the species of man, marine biologists at the Hawaii Oceanographic Institute reported Monday that dolphins, or family Delphinidae, have evolved opposable thumbs on their pectoral fins.    From Wordnik.com.  [planet.journals.ie] Reference

Delphinidae 14 April 2011 9:11PM.    From Wordnik.com.  [The Guardian World News] Reference

Delphinidae 8 February 2011 9:27AM.    From Wordnik.com.  [The Guardian World News] Reference

Delphinidae 31 January 2011 1:33PM.    From Wordnik.com.  [The Guardian World News] Reference

Delphinidae 8 February 2011 12:26PM.    From Wordnik.com.  [The Guardian World News] Reference

Delphinidae.    From Wordnik.com.  [Conservapedia - Recent changes [en]]

Their Delphinidae In Court: Forest.    From Wordnik.com.  [NZ On Screen] Reference